IF 4.5 2区化学

Polymer Pub Date : 2026-03-06 Epub Date: 2026-02-02 DOI: 10.1016/j.polymer.2026.129693

Yueling Shen, Ying Xu, Chen Chen, Cheng Zou, Yaoyao Yang, Deng-guang Yu

{"title":"The morphological control and formation mechanism of porous electrospun polyvinylidene fluoride fibers","authors":"Yueling Shen, Ying Xu, Chen Chen, Cheng Zou, Yaoyao Yang, Deng-guang Yu","doi":"10.1016/j.polymer.2026.129693","DOIUrl":"10.1016/j.polymer.2026.129693","url":null,"abstract":"<div><div>By integrating non-solvent induced phase separation (NIPS) with electrospinning technology, porous electrospun fibers can be prepared in a single step. However, the underlying mechanism of phase separation process during electrospinning are still not well understood. In this study, the regulatory effects of non-solvent types and their addition amounts on the morphology and composition of polyvinylidene fluoride (PVDF) electrospun fibers were systematically investigated by constructing various solvent/non-solvent systems, employing <em>N,N</em>-Dimethylacetamide (DMAC) or <em>N,N</em>-Dimethylformamide (DMF) as solvents, and water or ethanol as non-solvents. The results indicated that the incorporation of non-solvent significantly enhanced fiber diameter and uniformity, while promoting the formation of bicontinuous pores. Regardless of whether DMAC or DMF is used as the solvent, employing ethanol as the non-solvent results in a more uniform and densely packed porous structure compared to water. As the amount of non-solvent added increases, the internal porous structure of the fibers becomes increasingly superior. Additionally, the addition of non-solvent effectively facilitated the formation of <em>β</em>-phase and <em>γ</em>-phase through hydrogen bonding and confinement effects. The mechanism of NIPS-electrospinning was elucidated through ternary phase diagram and TGA analysis. Specifically, solvent evaporation led to the accumulation of condensed water on the fiber surface, triggering fiber solidification. Subsequently, the NIPS process continued internally within the fibers, resulting in the formation of superporous fibers with an internal bicontinuous pore structure.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"347 ","pages":"Article 129693"},"PeriodicalIF":4.5,"publicationDate":"2026-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146111008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Molecular dynamics study on the influence of a liquid-crystalline co-curing agent on the curing behavior and mechanical properties of epoxy resins 液晶共固化剂对环氧树脂固化性能和力学性能影响的分子动力学研究

IF 4.5 2区化学

Polymer Pub Date : 2026-03-06 Epub Date: 2026-02-03 DOI: 10.1016/j.polymer.2026.129675

Le Zhou , Chunhua Zhu , Junhua Zhao

{"title":"Molecular dynamics study on the influence of a liquid-crystalline co-curing agent on the curing behavior and mechanical properties of epoxy resins","authors":"Le Zhou , Chunhua Zhu , Junhua Zhao","doi":"10.1016/j.polymer.2026.129675","DOIUrl":"10.1016/j.polymer.2026.129675","url":null,"abstract":"<div><div>Epoxy resins are widely used in energy storage devices, electronic encapsulation, and structural adhesives owing to their excellent adhesion and electrical insulation properties. However, conventional epoxy systems still face challenges related to mechanical robustness and long-term service reliability. Molecular dynamics (MD) simulations provide an effective means to investigate structure–property relationships in crosslinked epoxy networks, yet their application is often hindered by the complexity of curing reactions and the limited efficiency and reproducibility of traditional atomistic modeling workflows. In this work, a lightweight graphical user interface (GUI) was developed to facilitate automatic and user-friendly generation of reaction-mapping templates for reactive molecular dynamics simulations based on the AutoMapper–LAMMPS fix bond/react framework. Using this platform, a ternary epoxy system comprising epoxy resin, curing agent, and a mesogenic comonomer was established. By systematically varying the crosslinking degree and comonomer content, the effects of network topology and local molecular ordering on mechanical behavior were elucidated. The results provide molecular-level insight into strategies for enhancing epoxy toughness without significantly compromising stiffness and demonstrate a generalizable and efficient methodology for simulating complex crosslinked polymer systems.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"347 ","pages":"Article 129675"},"PeriodicalIF":4.5,"publicationDate":"2026-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146111013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Effects of geometric discontinuities on tensile fatigue deterioration and life estimation in additively manufactured polylactic acid (PLA) parts 几何不连续对增材制造聚乳酸（PLA）零件拉伸疲劳劣化和寿命估计的影响

IF 4.5 2区化学

Polymer Pub Date : 2026-03-06 Epub Date: 2026-02-05 DOI: 10.1016/j.polymer.2026.129706

Mahsima Seifollahi, Mohammad Zaman Kabir, Sara Golbabapour

{"title":"Effects of geometric discontinuities on tensile fatigue deterioration and life estimation in additively manufactured polylactic acid (PLA) parts","authors":"Mahsima Seifollahi, Mohammad Zaman Kabir, Sara Golbabapour","doi":"10.1016/j.polymer.2026.129706","DOIUrl":"10.1016/j.polymer.2026.129706","url":null,"abstract":"<div><div>In this study, an integrated experimental–analytical framework was employed to investigate the effects of geometric imperfections on the static and fatigue behaviour of 3D-printed polylactic acid (PLA) specimens. The specimens were fabricated using Fused Deposition Modeling (FDM) with YZ orientation and a concentric infill pattern. Experimental results showed that a central hole with a stress concentration factor of 1.95 resulted in approximately 17% shorter fatigue life compared to edge-notched specimens. Notches and holes with a 2 mm radius yielded fatigue notch factors of 1.12 and 1.15, respectively, emphasizing the dominant influence of process-induced internal defects on fatigue damage evolution. To determine the notch geometry that can override the effect of internal defects on fatigue behaviour, the Theory of Critical Distance (TCD) coupled with numerical models was used to estimate the fatigue notch factor. In the numerical simulations, the internal porosity of the 3D-printed samples was taken into account to capture the interaction between notches and inherent defects. The analysis identified a notch aspect ratio of 0.25 as critical, exhibiting the highest fatigue notch factor of 1.59. Then, crack growth behaviour was monitored using Digital Image Correlation (DIC) and analysed through the Paris law to determine material constants. Fatigue life was subsequently estimated using a defect-based approach for 3D-printed PLA, explicitly accounting for process-induced internal defects.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"347 ","pages":"Article 129706"},"PeriodicalIF":4.5,"publicationDate":"2026-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146116119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Impact of amino functionalization on gelation properties of random terpolymer of oligo(ethylene glycol) methacrylates in water and physiological media 氨基功能化对低聚（乙二醇）甲基丙烯酸酯无规三元共聚物在水和生理介质中胶凝性能的影响

IF 4.5 2区化学

Polymer Pub Date : 2026-03-06 Epub Date: 2026-01-29 DOI: 10.1016/j.polymer.2026.129652

D. Lipowska-Kur , P. Groch , Ł. Otulakowski , K. Filipek , K. Jelonek , A. Utrata-Wesołek

{"title":"Impact of amino functionalization on gelation properties of random terpolymer of oligo(ethylene glycol) methacrylates in water and physiological media","authors":"D. Lipowska-Kur , P. Groch , Ł. Otulakowski , K. Filipek , K. Jelonek , A. Utrata-Wesołek","doi":"10.1016/j.polymer.2026.129652","DOIUrl":"10.1016/j.polymer.2026.129652","url":null,"abstract":"<div><div>Thermoreversible gels (thermogels) are formed when solutions of thermoresponsive polymers transition from a low-viscosity liquid state to a gel state upon exceeding the gelation temperature (<em>T</em><sub><em>GEL</em></sub>). This property makes them attractive materials for a wide range of biomedical applications, including tissue engineering and drug delivery. While the gelation mechanism of block copolymers containing hydrophilic and hydrophobic segments are well understood, the ability of random copolymers, particularly those containing thermoresponsive units, to form stable gels is still not well established. In this work, we explore the gelation behavior of random copolymers based on oligo(ethylene glycol) methacrylates, focusing on the impact of amino functional groups studied in their ammonium and amine forms, and directly comparing them to non-functionalized polymer. As comonomers, oligo(ethylene glycol) methacrylate (O; M<sub>n</sub> = 300 g/mol), di(ethylene glycol) methacrylate (D) and 2-aminoethyl methacrylate hydrochloride, introducing amino groups (in A<sup>(+)</sup> NH<sub>3</sub><sup>+</sup> and A NH<sub>2</sub> form), were used. The gelation behavior of the resulting copolymers was influenced by the presence of amine groups, their ionization state and the type of medium (water or PBS). Both the non-functionalized copolymer P(OD) and the amino-functionalized copolymer P(AOD) formed thermogels in water and PBS, whereas the ammonium-functionalized copolymer P(A<sup>(+)</sup>OD) exhibited gelation only in PBS. Moreover, the P(AOD) gel demonstrated superior mechanical strength and a more stable polymer network compared with the P(OD) gel, indicating a beneficial effect of amino groups on the properties of thermogelling materials. In addition, the amine-functionalized copolymer was found to be non-toxic, making the obtained materials particularly promising for biomedical applications.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"347 ","pages":"Article 129652"},"PeriodicalIF":4.5,"publicationDate":"2026-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146072856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Molecular dynamics study on the formation of the interface between low-density polyethylene and cross-linked polyethylene 低密度聚乙烯与交联聚乙烯界面形成的分子动力学研究

IF 4.5 2区化学

Polymer Pub Date : 2026-03-06 Epub Date: 2026-02-02 DOI: 10.1016/j.polymer.2026.129696

Chuxuan Chen, Zhaoyi Liu, Chaoqun Liu, Wei Yang, Guoqi Ma, Jiaping Pan, Yang Lv, Jinghui Gao, Li Yin

{"title":"Molecular dynamics study on the formation of the interface between low-density polyethylene and cross-linked polyethylene","authors":"Chuxuan Chen, Zhaoyi Liu, Chaoqun Liu, Wei Yang, Guoqi Ma, Jiaping Pan, Yang Lv, Jinghui Gao, Li Yin","doi":"10.1016/j.polymer.2026.129696","DOIUrl":"10.1016/j.polymer.2026.129696","url":null,"abstract":"<div><div>Exploring the interfacial behavior between different polymers is a hot issue in macromolecular blend materials. This paper takes low-density polyethylene (LDPE), cross-linked polyethylene (XLPE) and dicumyl peroxide (DCP) as models to investigate the interface formation process of different polymers and the diffusion behavior of small molecules by molecular dynamics simulation method using Consistent-Valence Force Field (CVFF) force field. The results reveal that interface between LDPE and XLPE forms through the penetration of linear polymer chains to cross-linked polymer chains, and van der Waals potential is the main driving attractive force. Temperature, pressure, and polymer network structure were found to have significantly influence the interface formation process. Additionally, DCP can introduce corss-linking structures to interface in theroy, the mobility of DCP in XLPE and LDPE were investigated and found that the diffusion coefficients of DCP in XLPE is only 1%–8% campring to that in LDPE. This study contributes to a further understanding of the interfacial formation mechanism of LDPE/XLPE blends.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"347 ","pages":"Article 129696"},"PeriodicalIF":4.5,"publicationDate":"2026-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146111010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Temperature-responsive hyperbranched block copolymers via RAFT self-condensing vinyl polymerization RAFT自缩聚法制备温度响应型超支化嵌段共聚物

IF 4.5 2区化学

Polymer Pub Date : 2026-03-06 Epub Date: 2026-02-03 DOI: 10.1016/j.polymer.2026.129699

Brett McLeland, Dean Afsar, Ayesha Imiya Mudiyanselage, Patricia R. Calvo

{"title":"Temperature-responsive hyperbranched block copolymers via RAFT self-condensing vinyl polymerization","authors":"Brett McLeland, Dean Afsar, Ayesha Imiya Mudiyanselage, Patricia R. Calvo","doi":"10.1016/j.polymer.2026.129699","DOIUrl":"10.1016/j.polymer.2026.129699","url":null,"abstract":"<div><div>Stimuli-responsive polymers that undergo sharp transitions in aqueous solution are of broad interest for drug delivery, sensing, and self-assembly. Here we report the synthesis of hyperbranched poly(N-isopropylacrylamide)-b-poly(N,N-dimethylacrylamide) (HB-PNIPAM-b-PDMA) block copolymers via reversible addition–fragmentation chain transfer (RAFT)-mediated self-condensing vinyl polymerization (SCVP) of well-defined macro chain-transfer monomers (macro-CTMs). PNIPAM and PDMA precursors were prepared with high end-group fidelity and converted to macro-CTMs, enabling hyperbranched chain extensions alongside linear and random analogues for systematic comparison. All polymerizations proceeded to high conversion, and the degree of branching was tunable with monomer feed and precursor length. Thermoresponsive behavior was strongly influenced by architecture. Linear block copolymers exhibited composition-dependent cloud points between 48 and 67 °C, while random copolymers showed transitions ∼10 °C higher than their block counterparts. In contrast, hyperbranched copolymers displayed broadened and shifted transitions, with cloud points spanning ∼31.5 °C to >80 °C depending on composition, degree of polymerization, and macro-CTM identity. Dynamic light scattering confirmed thermal aggregation above the transition. These results establish branching as a powerful design parameter for tuning the location and breadth of thermal transitions beyond what is achievable with linear copolymers, offering new opportunities for engineering responsive assemblies with tailored properties.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"347 ","pages":"Article 129699"},"PeriodicalIF":4.5,"publicationDate":"2026-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146111011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Green engineering of water-insoluble PVA/PAA nanofiber respiratory membranes for efficient particulate matter filtration with low pressure drop 水不溶性PVA/PAA纳米纤维呼吸膜的绿色工程，高效低压降颗粒物过滤

IF 4.5 2区化学

Polymer Pub Date : 2026-03-06 Epub Date: 2026-01-22 DOI: 10.1016/j.polymer.2026.129634

Ashraful Islam , Sudip Kumar Lahiri , Md. Akil Akhter , Muhammad Imran , Dong Mengmeng , Yanbo Liu

{"title":"Green engineering of water-insoluble PVA/PAA nanofiber respiratory membranes for efficient particulate matter filtration with low pressure drop","authors":"Ashraful Islam , Sudip Kumar Lahiri , Md. Akil Akhter , Muhammad Imran , Dong Mengmeng , Yanbo Liu","doi":"10.1016/j.polymer.2026.129634","DOIUrl":"10.1016/j.polymer.2026.129634","url":null,"abstract":"<div><div>Air pollution is a major concern due to rising particulate matter (PM) levels, requiring efficient filtration technologies for respiratory protection, and integrating eco-friendly fabrication methods further enhances environmental sustainability. We report water-insoluble nanofibrous membranes that combine high filtration efficiency (FE) with a low pressure drop (ΔP) for use in such masks. Using 18 % (w/v) polyvinyl alcohol (PVA) and polyacrylic acid (PAA) solutions in water, we electrospun four types of nanofiber membranes under optimised conditions (25 kV, 20 cm, 25 °C, 50 % RH). These included a pure PVA membrane and three PVA/PAA (60/40 wt%) composite membranes containing PAA of 3 kDa (NFM-1), 50 kDa (NFM-2), and both 3 kDa and 50 kDa (NFM-3). To induce crosslinking, all membranes were heat-treated at 100–160 °C for 25 min. Filtration tests showed that NFM-2 heat-treated at 140 °C achieved ∼99 % FE for particles ≥0.5 μm, with a ΔP of only 48 ± 1 Pa. Scanning electron microscopy (SEM) revealed smooth fibers with an average diameter of ∼192 nm and 59 % porosity for NFM-2. Fourier transform infrared (FTIR) spectroscopy confirmed the formation of ester linkages (–C<img>O–O–R) at ≥120 °C between PVA and PAA, indicating successful thermal crosslinking and improved stability. After crosslinking, NFM-2 also exhibited a water contact angle (θ) of ∼90° and retained 100 % of its weight after immersion in 70 °C water, demonstrating complete water insolubility. The nanofiber membranes were further integrated with polypropylene (PP) spunbond and meltblown nonwovens in multilayer assemblies (up to four layers) to evaluate composite filter performance. This water-based, organic-solvent-free electrospinning process offers a green approach to producing high-performance respiratory filters.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"347 ","pages":"Article 129634"},"PeriodicalIF":4.5,"publicationDate":"2026-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146021910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Highly efficient H2O2 photosynthesis coupled with benzylamine oxidation catalyzed by donor-acceptor type vinylene-linked covalent organic frameworks 用乙烯-受体共价有机框架催化H2O2与苯胺氧化的高效光合作用

IF 4.5 2区化学

Polymer Pub Date : 2026-03-06 Epub Date: 2026-01-28 DOI: 10.1016/j.polymer.2026.129671

Shujie Qiao, Machao Wang, Jun Wang, Mingshuan Yang, Zhiyong Guo, Hongbing Zhan

{"title":"Highly efficient H2O2 photosynthesis coupled with benzylamine oxidation catalyzed by donor-acceptor type vinylene-linked covalent organic frameworks","authors":"Shujie Qiao, Machao Wang, Jun Wang, Mingshuan Yang, Zhiyong Guo, Hongbing Zhan","doi":"10.1016/j.polymer.2026.129671","DOIUrl":"10.1016/j.polymer.2026.129671","url":null,"abstract":"<div><div>Photocatalytic hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) production is a safe, economical and environmentally friendly method to convert solar energy into storable chemical energy. However, the slow water oxidation process derived from the photogenerated valence holes is one of the main obstacles for the H<sub>2</sub>O<sub>2</sub> generation. The abovementioned dilemma can be resolved by consuming holes with sacrificial agent, e.g. benzylamine. In this paper, two vinylene-linked covalent organic frameworks (denoted as TMBP-1 and TMBP-2) with different donor-acceptor (D-A) strengths were synthesized. The constructed D-A architecture promoted the intramolecular charge transfer, which bolstered their corresponding photocatalytic performance. Impressively, when TMBP-2 adopted as the photocatalyst and air employed as the sole oxidant, highly efficient benzylamine coupling yield (>99.9 %) with a high H<sub>2</sub>O<sub>2</sub> production up to 6.3 mmol g<sup>−1</sup> h<sup>−1</sup> can be obtained within 5 h under ambient conditions. Generally, this work provided a green pathway for the photocatalytic H<sub>2</sub>O<sub>2</sub> production together with the manufacture of high value-added chemical intermediates.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"347 ","pages":"Article 129671"},"PeriodicalIF":4.5,"publicationDate":"2026-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146071674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 of curcumin-loaded microparticles from star-shaped poly(lactic acid) stereo-complex 星形聚乳酸立体配合物制备载姜黄素微粒子

IF 4.5 2区化学

Polymer Pub Date : 2026-03-06 Epub Date: 2026-02-02 DOI: 10.1016/j.polymer.2026.129695

Ayane Kawamura , Tsutomu Ishihara , Masanori Terasaki , Tomohiro Sago , Tadashi Tsukamoto , Yuji Shibasaki

{"title":"Preparation of curcumin-loaded microparticles from star-shaped poly(lactic acid) stereo-complex","authors":"Ayane Kawamura , Tsutomu Ishihara , Masanori Terasaki , Tomohiro Sago , Tadashi Tsukamoto , Yuji Shibasaki","doi":"10.1016/j.polymer.2026.129695","DOIUrl":"10.1016/j.polymer.2026.129695","url":null,"abstract":"<div><div>The development of new biocompatible and biodegradable microparticles offering longer sustained drug release and greater stability than existing systems remains critical for subcutaneous injections. In this study, new microparticles based on a polylactide (PLA) stereo-complex (scPLA) stabilized with stearyl poly(ethylene glycol) (stPEG) were prepared. Curcumin, as a carrier drug, was encapsulated inside the prepared scPLA microparticles using the solution mixing method. Optical PLA isomers were prepared to enhance the loading capacity using mannose as a polyfunctional initiator, and scPLA samples were prepared via solution precipitation using the corresponding isomers. Varying the molecular weights and combinations of the isomers yielded scPLA microparticles with sizes ranging from 1.0 to 2.2 μm. These particles exhibited a single melting point (<em>T</em><sub>m</sub>) at approximately 215 °C, confirming the absence of PLA crystals (<em>T</em><sub>m</sub> = 150 °C). The desired curcumin-containing scPLA microparticles were successfully prepared by co-introducing curcumin and stPEG in the solution, with the maximum curcumin loading capacity reaching 14 wt%. scPLA microparticles loaded with curcumin showed significantly superior sustained release properties compared to nanoparticles composed of well-known mPEG-PLA copolymers also loaded with curcumin. This indicates that the highly stable crystalline structure of scPLA enabled the long-term drug release.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"347 ","pages":"Article 129695"},"PeriodicalIF":4.5,"publicationDate":"2026-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146101794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Key determinants of hydrolytic stability of PLA/PBS blend fibers: The role of aromatic sulfonate derivative and carbodiimide PLA/PBS共混纤维水解稳定性的关键决定因素：芳香磺酸盐衍生物和碳二亚胺的作用

IF 4.5 2区化学

Polymer Pub Date : 2026-03-06 Epub Date: 2026-02-04 DOI: 10.1016/j.polymer.2026.129669

Young Kwang Kim , Hye-Jin Seo , Seong Hui Hong , Chang-Hun Lee , Ik Sung Choi , Hyun Woo Song , Sang Kyoo Lim

{"title":"Key determinants of hydrolytic stability of PLA/PBS blend fibers: The role of aromatic sulfonate derivative and carbodiimide","authors":"Young Kwang Kim , Hye-Jin Seo , Seong Hui Hong , Chang-Hun Lee , Ik Sung Choi , Hyun Woo Song , Sang Kyoo Lim","doi":"10.1016/j.polymer.2026.129669","DOIUrl":"10.1016/j.polymer.2026.129669","url":null,"abstract":"<div><div>The hydrolytic stability of poly (lactic acid) (PLA)/poly (butylene succinate) (PBS) blend fibers was systematically investigated by incorporating an aromatic sulfonate derivative (nucleating agent, N) and carbodiimide (anti-hydrolysis agent, Anti-H). Neat PLA/PBS blend fibers (3 wt% PBS) retained only ∼53.9% of their initial tensile strength after hydrolysis, whereas fibers containing both the nucleating agent (N) and anti-hydrolysis agent (Anti-H) preserved up to 97.2% of their initial strength. DSC and 2D-WAXD analyses showed that N selectively promoted the development and retention of the PLA (203) crystalline reflection, accompanied by enhanced crystallinity and molecular orientation along the PLA (200)/(110) planes. 1D-WAXD demonstrated that the intensity ratio of PLA (203) to PLA (200)/(110) reflections correlates with hydrolytic retention following a Boltzmann-type sigmoidal relationship, with a critical threshold x<sub>0</sub> ≈ 0.227. Time-dependent FTIR and XPS analyses demonstrated that Anti-H effectively capped the terminal –COOH groups, suppressing autocatalytic chain scission and providing complementary chemical stabilization. Hydrolysis decreased –COOH and –C<img>O functional groups, while the H-bonded –OH increased. Correlation analysis indicated that changes in –C<img>O most strongly influenced tensile retention. SEM observations revealed smooth fiber surfaces with no discernible defects or phase separation, as well as minimal morphological and compositional changes in the optimized fibers after hydrolysis. Collectively, these results demonstrate that the exceptional hydrolytic durability of PLA/PBS blend fibers arises from the synergistic interplay of selective (203) crystalline coherence, preserved molecular orientation, and chemical end-group stabilization.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"347 ","pages":"Article 129669"},"PeriodicalIF":4.5,"publicationDate":"2026-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146135323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Polymer最新文献