Journal of Polymer Research最新文献_第10页

Monomer sequence analysis: unraveling the molecular fingerprint for synthetic copolymer structure 单体序列分析：揭示合成共聚物结构的分子指纹图谱

IF 2.8 4区化学

Journal of Polymer Research Pub Date : 2026-03-19 DOI: 10.1007/s10965-026-04823-8

Shaohui Liu, Chen Zhang, Maolin Cheng, Lindeng Ma, Kun Yang, Jingjing Wen, Limin Gu, Tong Wu, Fengxia Sun

{"title":"Monomer sequence analysis: unraveling the molecular fingerprint for synthetic copolymer structure","authors":"Shaohui Liu, Chen Zhang, Maolin Cheng, Lindeng Ma, Kun Yang, Jingjing Wen, Limin Gu, Tong Wu, Fengxia Sun","doi":"10.1007/s10965-026-04823-8","DOIUrl":"10.1007/s10965-026-04823-8","url":null,"abstract":"<div>\u0000 \u0000 <p>Synthetic copolymer, as high-molecular compounds, are constructed by the linkage of numerous monomer molecules via chemical bonds. The distribution of monomer sequences within polymers exerts a direct influence on their properties and applications. Thus, comprehensive analysis of monomer sequence distribution constitutes a critical research focus in polymer science, particularly for establishing structure-property correlations and guiding the rational design of advanced polymeric materials. This review mainly outlines three principal analytical approaches: 1) nuclear magnetic resonance spectroscopy (NMR) for determining comonomer triad and tetrad sequences through chemical shift in spectra; 2) pyrolysis-gas chromatography-mass spectrometry (Py-GC/MS) enabling dimers and trimers fragments sequence confirmation via thermal degradation characteristics; and 3) Kerr effect-based techniques utilizing electric field-induced birefringence measurements to probe orientation-dependent macromolecular arrangements. The synergistic application of these complementary characterization methods provides a multi-dimensional analytical framework for decoding complex polymer microstructures. This work aims to offer methodological guidance for researchers engaged in monomer sequence analysis and microstructure characterization.</p>\u0000 </div>","PeriodicalId":658,"journal":{"name":"Journal of Polymer Research","volume":"33 4","pages":""},"PeriodicalIF":2.8,"publicationDate":"2026-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147560456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Camellia sinensis extract-loaded PVA/PVP dissolving microneedle patches for potential herbal-derived antioxidant dressings: fabrication and physicochemical investigations 山茶提取物PVA/PVP溶解微针贴剂的制备及理化研究

IF 2.8 4区化学

Journal of Polymer Research Pub Date : 2026-03-19 DOI: 10.1007/s10965-026-04842-5

Tien Dat Nguyen, Thi-Hiep Nguyen, Thanh-Qua Nguyen

{"title":"Camellia sinensis extract-loaded PVA/PVP dissolving microneedle patches for potential herbal-derived antioxidant dressings: fabrication and physicochemical investigations","authors":"Tien Dat Nguyen, Thi-Hiep Nguyen, Thanh-Qua Nguyen","doi":"10.1007/s10965-026-04842-5","DOIUrl":"10.1007/s10965-026-04842-5","url":null,"abstract":"<div>\u0000 \u0000 <p><i>Camellia sinensis</i> extract from green tea leaves (GT) has been well-documented in the literature for its numerous health benefits, including remarkable antioxidant activity, which is believed to effectively neutralize excessive reactive oxygen species (ROS), especially during the inflammatory phase of wound healing. Herein, this study investigates the physicochemical aspects of herbal antioxidant-loaded dissolving microneedle patches by incorporating GT within a poly(vinyl alcohol)/polyvinylpyrrolidone (PVA/PVP) matrix for potential wound dressing applications using the micromolding technique. Physicochemical characterization of the PVA/PVP@GT microneedle patches, including morphological, chemical, thermal stability, mechanical, penetration, dissolution, and antioxidant properties, was comprehensively evaluated. Experimental results from this work demonstrated that the obtained microneedles exhibited well-formed morphological structures, successful loading of the materials with high thermal stability, sufficient mechanical strength, effective skin penetration, and rapid dissolution within 5–10 min. Notably, the DPPH radical scavenging assay revealed that the proposed system has shown significant antioxidant activity. These findings highlight the potential for future biological and clinical translational research of this simple, low-cost, and patient-friendly microneedle-based delivery system for delivering herbal-loaded antioxidants to accelerate wound healing.</p>\u0000 </div>","PeriodicalId":658,"journal":{"name":"Journal of Polymer Research","volume":"33 4","pages":""},"PeriodicalIF":2.8,"publicationDate":"2026-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147559783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synergistic flame retardancy of layered double hydroxide and decabromodiphenyl ethane in glass fiber-reinforced polypropylene 层状双氢氧化物与十溴二苯乙烷在玻璃纤维增强聚丙烯中的协同阻燃性能

IF 2.8 4区化学

Journal of Polymer Research Pub Date : 2026-03-18 DOI: 10.1007/s10965-026-04840-7

Xin-Yi He, Zhen-Yan Hu, Chun-Xue Wang, Alaaddin M. M. Saeed, Shao-Kang Qian, Qi-Jia Zhang, Gui-Ping Cao

{"title":"Synergistic flame retardancy of layered double hydroxide and decabromodiphenyl ethane in glass fiber-reinforced polypropylene","authors":"Xin-Yi He, Zhen-Yan Hu, Chun-Xue Wang, Alaaddin M. M. Saeed, Shao-Kang Qian, Qi-Jia Zhang, Gui-Ping Cao","doi":"10.1007/s10965-026-04840-7","DOIUrl":"10.1007/s10965-026-04840-7","url":null,"abstract":"<div>\u0000 \u0000 <p>Improving the flame retardancy of polypropylene (PP) often compromises its mechanical properties. This study introduced an effective strategy to simultaneously enhance flame retardancy and preserve mechanical performance by incorporating glass fibers (GF) as reinforcement and introducing a ball-milled ternary flame retardant system composed of decabromodiphenyl ethane (DB), antimony trioxide (AO), and layered double hydroxide (LDH). The PP-based composites were fabricated using melt extrusion compounding followed by compression molding. This work focused on optimizing the flame-retardant formulation and comprehensively evaluating the microstructural morphology, flame-retardant behavior, thermal stability, and mechanical properties of the composites. The results indicate that LDH partially substitutes the conventional DB-AO system by decomposing to absorb heat, releasing non-combustible gases, and forming protective metal oxide layers during combustion. Additionally, LDH effectively captures hydrogen bromide (HBr) released from DB decomposition, thereby enhancing flame-retardant efficiency and mitigating environmental concerns through delayed bromine emission. The incorporation of the DB-AO-LDH system led to a 27.0% reduction in total heat release (THR) and a 33.7% increase in the fire performance index (FPI). Furthermore, ball milling was found to significantly improve the dispersion and exfoliation of LDH, promoting strong electrostatic interactions among the flame retardant components and enhancing their synergistic performance. Notably, the ball-milled DB-AO-LDH system imparted excellent flame retardancy to GF-reinforced PP at a loading below 15 wt%, achieving a UL-94 V-0 classification without compromising its mechanical integrity.</p>\u0000 </div>","PeriodicalId":658,"journal":{"name":"Journal of Polymer Research","volume":"33 4","pages":""},"PeriodicalIF":2.8,"publicationDate":"2026-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147559852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Branching and crosslinking effects on the properties and reuse potential of recycled, biobased and biodegradable poly(butylene succinate) (PBS) 分支和交联效应对再生、生物基和可生物降解聚丁二酸丁二烯（PBS）性能和再利用潜力的影响

IF 2.8 4区化学

Journal of Polymer Research Pub Date : 2026-03-18 DOI: 10.1007/s10965-026-04828-3

Maud Plouzeau, Edgar Pigeon, Delphine Barbier, Laurent Cauret

{"title":"Branching and crosslinking effects on the properties and reuse potential of recycled, biobased and biodegradable poly(butylene succinate) (PBS)","authors":"Maud Plouzeau, Edgar Pigeon, Delphine Barbier, Laurent Cauret","doi":"10.1007/s10965-026-04828-3","DOIUrl":"10.1007/s10965-026-04828-3","url":null,"abstract":"<div>\u0000 \u0000 <p>To assess the mechanical recyclability of poly(butylene succinate) (PBS), the polymer was subjected to five successive melt processing cycles using a twin-screw extruder. Samples collected from each cycle were fully characterized. Size exclusion chromatography (SEC) analysis revealed a slight increase in PBS molar mass, a trend corroborated by a concurrent decrease in melt flow index (MFI) values and an increase in gel fraction in recycled samples. These findings suggest the formation of crosslinked polymer chains during reprocessing. Dynamic mechanical analysis (DMA) further confirmed these structural changes, showing a significant increase in the glass transition temperature indicative of restricted molecular mobility. Mechanical tests demonstrated that recycled PBS exhibited slightly reduced stiffness compared to the virgin material. Despite this minor trade-off, the study highlights PBS’s potential as a mechanically recyclable biopolymer, with reprocessing-induced structural modifications offering opportunities to tailor its properties for circular economy applications.</p>\u0000 </div>","PeriodicalId":658,"journal":{"name":"Journal of Polymer Research","volume":"33 4","pages":""},"PeriodicalIF":2.8,"publicationDate":"2026-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147559853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of cross-linking reaction on the mechanical properties of aliphatic polyketone/polyamide 6 blend 交联反应对脂肪族聚酮/聚酰胺6共混物力学性能的影响

IF 2.8 4区化学

Journal of Polymer Research Pub Date : 2026-03-18 DOI: 10.1007/s10965-026-04850-5

Jeongyoun Park, Younggon Son

{"title":"Effect of cross-linking reaction on the mechanical properties of aliphatic polyketone/polyamide 6 blend","authors":"Jeongyoun Park, Younggon Son","doi":"10.1007/s10965-026-04850-5","DOIUrl":"10.1007/s10965-026-04850-5","url":null,"abstract":"<div>\u0000 \u0000 <p>This study examines the unusually high impact strength observed in aliphatic polyketone (PK)/polyamide 6 (PA6) blends, which deviates positively from typical immiscible polymer behavior. While previous literature attributes this enhancement to partial miscibility caused by hydrogen bonding between the carbonyl groups of PK and the amide groups of PA6, the present study provides several evidence suggesting that cross-linking, not hydrogen bonding, is the primary mechanism. Two types of PA6 were used: standard PA6 (with –NH₂/–COOH end groups) and end-capped PA6 (ePA6, with –COOH/–COOH end groups). Both PK/PA6 and PK/ePA6 blends showed similarly fine morphologies, but only the PK/PA6 blend exhibited a strong positive deviation in impact strength. Additionally, the PK/PA6 blends appeared much darker in color compared to the lighter PK/ePA6 blends. When dissolved in solvent, the PK/PA6 samples left behind a substantial amount of gel-like, insoluble material, believed to be a cross-linked polymer. This residue was minimal in PK/ePA6 blends. Further, as melt-mixing time increased from 2 to 7 min, the PK/PA6 samples became progressively darker, the amount of insoluble fraction increased from 0% to 48%, and the impact strength rose significantly from 129 to 493.3 J/m, while domain size remained nearly unchanged. These findings indicate that the enhanced mechanical properties result from a chemical cross-linking reaction—likely involving the terminal –NH₂ group of PA6—with PK, rather than from hydrogen bonding. The absence of this behavior in the PK/ePA6 blend supports the conclusion that the –NH₂ end group plays a critical role in facilitating cross-linking and improving impact performance.</p>\u0000 </div>","PeriodicalId":658,"journal":{"name":"Journal of Polymer Research","volume":"33 4","pages":""},"PeriodicalIF":2.8,"publicationDate":"2026-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10965-026-04850-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147559854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hexagonal boron nitride for enhancing directional thermal conductivity in polymer matrices 六方氮化硼增强聚合物基体的定向导热性

IF 2.8 4区化学

Journal of Polymer Research Pub Date : 2026-03-17 DOI: 10.1007/s10965-026-04821-w

Anuj Dahiwal, Balasubramanian Kandasubramanian, Manisha Kulthe, Sajal Umak

{"title":"Hexagonal boron nitride for enhancing directional thermal conductivity in polymer matrices","authors":"Anuj Dahiwal, Balasubramanian Kandasubramanian, Manisha Kulthe, Sajal Umak","doi":"10.1007/s10965-026-04821-w","DOIUrl":"10.1007/s10965-026-04821-w","url":null,"abstract":"<div>\u0000 \u0000 <p>The improvement of Directional Thermal Conductivity (DTC) within the polymer-based composites is important for high-performance heat management, particularly in power storage devices and technologies. The combination of electrical insulation, low density, and strong in-plane Thermal Conductivity (TC) has made hexagonal boron nitride (h-BN) a desirable filler among other materials in use. To fully utilize h-BN’s potential, challenges pertaining to its orientation, dispersion, and interfacial compatibility within the polymer matrix must be resolved. An approach to enhancing DTC in composites based on h-BN is described. To enhance filler–matrix compatibility and orientation, this review discusses surface modification procedures such as hydroxylation (acid treatment, plasma exposure, or thermal oxidation) and Silanization (silane coupling agents like KH560 and APTES). Key factors influencing DTC, including filler size, aspect ratio, orientation angle, h-BN conductivity, matrix conductivity, and interface thermal resistance, are investigated. The review also addresses isotopic engineering of boron as ¹¹B enrichment to enhance intrinsic TC while reducing phonon scattering. Fabrication methods like vacuum-assisted filtering, shear-induced methods, and magnetic/electric field alignment are discussed. This review is the first that analytically contemplates advanced characterization techniques encompassing optothermal Raman spectroscopy, MTPS, and Transient Plane Source for DTC characteristics of h-BN/polymer composites. In conclusion, the review offers a thorough framework for improving h-BN/polymer composites using alignment, isotopic engineering, and surface modification methods. It lays the groundwork for scalable, directionally conductive materials appropriate for new applications in temperature control, energy retention, and semiconductors by focusing on both production techniques and sophisticated characterization tools.</p>\u0000 </div>","PeriodicalId":658,"journal":{"name":"Journal of Polymer Research","volume":"33 4","pages":""},"PeriodicalIF":2.8,"publicationDate":"2026-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147560158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Deposition of amorphous hydrogenated carbon (a-C:H) layers as a function of time and angle geometry: A powerful method for tailoring the surface properties of polyhydroxybutyrate films 沉积无定形氢化碳（a- c:H）层作为时间和角度几何的函数：一种剪裁聚羟基丁酸盐薄膜表面特性的有力方法

IF 2.8 4区化学

Journal of Polymer Research Pub Date : 2026-03-16 DOI: 10.1007/s10965-026-04831-8

Lucas Beucher, Torben Schlebrowski, Stefan Wehner, Christian B. Fischer

{"title":"Deposition of amorphous hydrogenated carbon (a-C:H) layers as a function of time and angle geometry: A powerful method for tailoring the surface properties of polyhydroxybutyrate films","authors":"Lucas Beucher, Torben Schlebrowski, Stefan Wehner, Christian B. Fischer","doi":"10.1007/s10965-026-04831-8","DOIUrl":"10.1007/s10965-026-04831-8","url":null,"abstract":"<div><p>Polyhydroxybutyrate (PHB) is a biodegradable polymer derived from renewable resources, offering similar mechanical properties to petrochemical polypropylene. However, the surface properties needed for a wide range of applications are demanding and require controlled treatment. Appropriate surface modifications, such as the application of thin functional layers, can change and improve their characteristics. A promising approach involves the deposition of thin amorphous hydrogenated carbon (a-C:H) layers via low-temperature radio frequency plasma-enhanced chemical vapor deposition. This can tailor surface properties such as wettability and the chemical composition. Both are influenced by the sp<sup>2</sup>/sp<sup>3</sup> carbon bond ratio, which in turn depends on the angle of plasma incidence. Accordingly, changing the coating geometry also changes layer properties. Here, PHB films were coated with a-C:H layers at different angles and with different thicknesses. Scanning electron and atomic force microscopy recorded the surface morphology, while contact angle goniometry was used to determine the wetting hysteresis and the surface free energy. Results show that increasing layer thickness reduces the variability in contact angle hysteresis. Surface-sensitive synchrotron-assisted spectroscopy and specular reflection IR spectroscopy revealed angle-dependent variations in the sp<sup>2</sup>/sp<sup>3</sup> bond ratio, confirming a direct correlation between coating geometry and surface chemistry.</p></div>","PeriodicalId":658,"journal":{"name":"Journal of Polymer Research","volume":"33 4","pages":""},"PeriodicalIF":2.8,"publicationDate":"2026-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147559428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation and characterization of thermosensitive microcapsules: polyurethane shell encapsulating paraffin and rosemary essential oil core 热敏微胶囊的制备与表征：聚氨酯壳包石蜡和迷迭香精油芯

IF 2.8 4区化学

Journal of Polymer Research Pub Date : 2026-03-16 DOI: 10.1007/s10965-026-04846-1

Yuhang Mei, Xueyu Cheng, Yi Chen, Xinyuan Zhou, Lixin Lu

{"title":"Preparation and characterization of thermosensitive microcapsules: polyurethane shell encapsulating paraffin and rosemary essential oil core","authors":"Yuhang Mei, Xueyu Cheng, Yi Chen, Xinyuan Zhou, Lixin Lu","doi":"10.1007/s10965-026-04846-1","DOIUrl":"10.1007/s10965-026-04846-1","url":null,"abstract":"<div>\u0000 \u0000 <p>This research aimed to prepare a novel temperature sensitive microcapsule for encapsulation and temperature sensitive controlled release of liquid fragrances. Accordingly, polyurethane with temperature sensitivity effect was synthesized by polycaprolactone(PCL), 4,4’ - diphenyl diisocyanate(MDI) and 1,4-butanediol(BDO) through two-step solution block copolymerization technology, which was used as a shell material. The core material was formed by emulsification of Paraffin(Pw) and rosemary essential oil(REO). The shell materials were polymerized by in-situ polymerization to prepare the temperature sensitive microcapsules TSPU@Pw. Effects of encapsulation temperature, time, and core-wall ratio on yield and encapsulation efficiency of the microcapsules were investigated. REO release behavior of TSPU@Pw was tested and its temperature response characteristics was verified. The results indicated that the required microcapsules were prepared by the method proposed successfully. Under the conditions of encapsulation temperature of 75℃, encapsulation time of 2 h, and core wall mass ratio of 0.6, the encapsulation efficiency of TSPU@Pw was 70.88%, and the corresponding temperature sensitivity range was 38–45℃. At a phase transition temperature of 41.7℃, the release rate of REO increased by 77.45% after 240 min compared to 30℃, demonstrating a significant temperature responsive control release effect. The application of Korsmeyer Peppas model could effectively characterize the release characteristics of REO in microcapsules, could be attributed to the presence of capillary effects based on shell pores in the release of REO.</p>\u0000 </div>","PeriodicalId":658,"journal":{"name":"Journal of Polymer Research","volume":"33 4","pages":""},"PeriodicalIF":2.8,"publicationDate":"2026-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147559436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Salt free open vessel photoinduced supplemental activator reducing agent atom transfer radical polymerization 无盐开槽光诱导补充活化剂还原剂原子转移自由基聚合

IF 2.8 4区化学

Journal of Polymer Research Pub Date : 2026-03-16 DOI: 10.1007/s10965-026-04817-6

Matthew Kirubakaran, Kannapiran Rajendrakumar

{"title":"Salt free open vessel photoinduced supplemental activator reducing agent atom transfer radical polymerization","authors":"Matthew Kirubakaran, Kannapiran Rajendrakumar","doi":"10.1007/s10965-026-04817-6","DOIUrl":"10.1007/s10965-026-04817-6","url":null,"abstract":"<div>\u0000 \u0000 <p>Though homogeneous CuBr<sub>2</sub>/Ligand complex has facilitated Reversible Deactivation Radical Polymerization, its practical use in advanced applications is often restricted due to metal contamination and difficulty in catalyst separation. To address these issues, a heterogeneous catalyst, Cu(0)-wire, Supplemental Activator Reducing Agent (SARA) or other photo redox catalyst, were introduced. However, the system still relies on the inclusion of external Cu(II) salts, thereby retaining the characteristics of a homogeneous system. As a method for overcoming the challenges of metal contamination and catalyst separation, we demonstrate Photoinduced SARA Open vessel Atom Transfer Radical Polymerization, using Cu(0)-wire under UV light to polymerize well-defined polymethyl methacrylate (PMMA). This heterogenous catalytic system demonstrates both molecular weight and distribution, without the addition of external Cu(II) salts. With the attained minimum induction period, the effect of different light sources (UV, LED, IR), N,N, N′,N″,N′′-pentamethyldiethylenetriamine (PMDETA) concentration and the length of Cu(0) wire on the kinetics and control were investigated thoroughly. Here, the irradiation of Cu(0)/PMDETA complex using domestic 8 W UV lamp (365 nm, 4.2 cm<sup>− 2</sup>) was sufficient for an efficient activation and deactivation cycle. The facile transfer of electrons to generate both Cu(II) and Cu(I) on UV irradiation was characterized through cyclic voltammetry. The synergy between Cu(0)/PMDETA and UV irradiation facilitate the synthesis of different degree of polymerization (DP<sub><i>n</i></sub>) ranging from 50 to 400. An efficient reinitiation and temporal control of the polymer chain were exemplified through intermittent irradiation. The high-end group fidelity of PMMA was further demonstrated through subsequent chain extension and block copolymerization.</p>\u0000 </div>","PeriodicalId":658,"journal":{"name":"Journal of Polymer Research","volume":"33 4","pages":""},"PeriodicalIF":2.8,"publicationDate":"2026-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147559431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cinchonine- and Cinchonidine-Derived Chiral Squaramide Polymers: Synthesis and Application in Asymmetric Catalysis Cinchonine-和cinchonidine -衍生手性方酰胺聚合物的合成及其在不对称催化中的应用

IF 2.8 4区化学

Journal of Polymer Research Pub Date : 2026-03-13 DOI: 10.1007/s10965-026-04766-0

Mohammad Shahid Ullah, Mohammad Farhadur Rahman, Shinichi Itsuno

{"title":"Cinchonine- and Cinchonidine-Derived Chiral Squaramide Polymers: Synthesis and Application in Asymmetric Catalysis","authors":"Mohammad Shahid Ullah, Mohammad Farhadur Rahman, Shinichi Itsuno","doi":"10.1007/s10965-026-04766-0","DOIUrl":"10.1007/s10965-026-04766-0","url":null,"abstract":"<div>\u0000 \u0000 <p>In this study, a new chiral polymer incorporating cinchonine- and cinchonidine-based squaramide units in its main chain has been successfully synthesized and evaluated as asymmetric organocatalysts. The novelty of this work lies in the integration of dual cinchonine- and cinchonidine cinchona moieties within the squaramide framework, offering enhanced chiral environments and hydrogen-bonding capabilities for asymmetric catalysis. Cinchonine- and cinchonidine-based chiral squaramide monomers bearing olefinic double bonds were first designed and synthesized, followed by the Mizoroki–Heck coupling polymerization reaction using various diiodo linkers to yield the desired polymers with controlled microenvironment. The resulting polymeric catalysts exhibited remarkable catalytic activity (upto 99% yield) and enantioselectivity (upto 94% ee, 75:1 dr) in model asymmetric reactions, demonstrating the significant role of the cinchonine- and cinchonidine cinchona-derived units and solvent polarity on the reaction outcome. Importantly, due to their insolubility in common organic solvents, the polymeric catalysts could be easily recovered and reused multiple times without noticeable loss of performance. These findings establish a new strategy for developing recyclable chiral polymeric catalysts based on cinchonine- and cinchonidine cinchona–squaramide frameworks, combining high catalytic efficiency, robust stability, and excellent reusability for sustainable asymmetric synthesis.</p>\u0000 </div>","PeriodicalId":658,"journal":{"name":"Journal of Polymer Research","volume":"33 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2026-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147441545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0