Polymer最新文献_第10页

Moving beyond organosilanes: Tris(hydroxymethyl)aminomethane as a superior surface modifier for zirconia in NBR composites 超越有机硅烷：三（羟甲基）氨基甲烷作为丁腈橡胶复合材料中氧化锆的优良表面改性剂

IF 4.1 2区化学

Polymer Pub Date : 2025-04-14 DOI: 10.1016/j.polymer.2025.128405

Surabhi S. Raut , Shubham C. Ambilkar , Bharat P. Kapgate , Amit Das , Subhradeep Mandal , Anik Kumar Ghosh , Chayan Das

{"title":"Moving beyond organosilanes: Tris(hydroxymethyl)aminomethane as a superior surface modifier for zirconia in NBR composites","authors":"Surabhi S. Raut , Shubham C. Ambilkar , Bharat P. Kapgate , Amit Das , Subhradeep Mandal , Anik Kumar Ghosh , Chayan Das","doi":"10.1016/j.polymer.2025.128405","DOIUrl":"10.1016/j.polymer.2025.128405","url":null,"abstract":"<div><div>This study investigates the potential of Tris(hydroxymethyl)aminomethane (Tris) as a surface modifier for zirconia to enrich the ultimate properties of nitrile rubber (NBR) composites. By substituting commonly used organosilanes with Tris to modify the surface of zirconia, significant improvement in zirconia particle dispersion within the NBR matrix is achieved, leading to a stronger rubber-filler interaction. Scanning electron microscopy (SEM) images reveal a finer dispersion of zirconia particles, facilitated by the efficient surface modification of zirconia by Tris. Rubber-filler interactions, examined through the Lorenz-Park principles and viscoelastic properties, demonstrate that Tris modification reduces the surface energy of zirconia, enhancing its dispersibility and improving interfacial bonding between the rubber and the zirconia due to increased reactivity. This causes significant improvement in mechanical and other composite properties such as thermal stability, oil resistance, flame retardancy for the Tris modified <em>in situ</em> zirconia filled composites. Among the compositions examined, the composite containing 2 phr of Tris and 30 phr of zirconia (In-2T-Zr-30) exhibits a substantial improvement in tensile strength, over 20 times higher than that of the unfilled sample. These findings highlight the potential of Tris as an effective surface modifier for zirconia, enhancing filler performance and offering a promising alternative to organosilanes in the development of high-performance nitrile rubber composites.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"328 ","pages":"Article 128405"},"PeriodicalIF":4.1,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143827624","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

Rational design of glycidyl azide polymer-based triblock copolymers for high-performance energetic thermoplastic elastomers 基于叠氮缩水甘油酯聚合物的高性能高能热塑性弹性体三嵌段共聚物的合理设计

IF 4.1 2区化学

Polymer Pub Date : 2025-04-14 DOI: 10.1016/j.polymer.2025.128403

Ming-Yen Tsai , Ming-Chieh Lin , Shih-Ya Hong , Yi-Chen Wu , Mohamed Gamal Mohamed , Shiao-Wei Kuo

{"title":"Rational design of glycidyl azide polymer-based triblock copolymers for high-performance energetic thermoplastic elastomers","authors":"Ming-Yen Tsai , Ming-Chieh Lin , Shih-Ya Hong , Yi-Chen Wu , Mohamed Gamal Mohamed , Shiao-Wei Kuo","doi":"10.1016/j.polymer.2025.128403","DOIUrl":"10.1016/j.polymer.2025.128403","url":null,"abstract":"<div><div>In aerospace applications, such as rockets and missiles, using thermoplastic elastomers (TPEs) in rocket propellants offers favorable properties that may allow them to replace traditional thermosetting elastomers. This study investigates the synthesis of energetic thermoplastic elastomers (ETPEs) with energetic characteristics, specifically focusing on synthesizing glycidyl azide polymer (GAP) ETPE and the effect of varying hard segment ratios on their physical properties. However, only the presence of azide side chains negatively impacts the mechanical properties of the ETPE and to address this issue, an ABA triblock copolymer synthesis approach is employed, utilizing poly (<em>ε</em>-caprolactone) (PCL) long linear chains to modify the original GAP, forming PCL-GAP-PCL ETPE. The introduction of PCL-GAP-PCL triblock copolymers significantly enhanced the mechanical properties of the resulting ETPE, providing substantial benefits for its use in specific environments. Furthermore, this study also investigates the effects of varying soft/hard segment ratios in the ETPE, suggesting that the subsequent incorporation of oxidizer fillers could yield favorable mechanical properties. Additionally, 2D infrared spectroscopy (2D-IR) was utilized to understand the effects of hydrogen bond formation and dissociation.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"327 ","pages":"Article 128403"},"PeriodicalIF":4.1,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143831822","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

Transparent polyimides derived from phenyl group substituted 2,2′-bis(trifluoromethyl)benzidines with low dielectric constant at high frequencies 由苯基取代的2,2 ' -双（三氟甲基）联苯胺衍生的透明聚酰亚胺，在高频下具有低介电常数

IF 4.1 2区化学

Polymer Pub Date : 2025-04-12 DOI: 10.1016/j.polymer.2025.128393

Lei Yang , Jinglei Xing , Xingzhong Fang , Guofei Chen

{"title":"Transparent polyimides derived from phenyl group substituted 2,2′-bis(trifluoromethyl)benzidines with low dielectric constant at high frequencies","authors":"Lei Yang , Jinglei Xing , Xingzhong Fang , Guofei Chen","doi":"10.1016/j.polymer.2025.128393","DOIUrl":"10.1016/j.polymer.2025.128393","url":null,"abstract":"<div><div>With the rapid advancement of 5G communication, polyimides, currently employed as an insulating interlayer material in commercial applications, can no longer fulfill the low dielectric constant and low dielectric loss requirements imposed by high-frequency signals. To solve this problem, increasing the free volume between molecular chains is a practical and effective way to achieve the low dielectric constant of polyimides. In this work, two novel diamines with different bulky phenyl groups at <em>ortho</em> position of the amino group of 2,2′-bis(trifluoromethyl)benzidine (TFDB) were designed and synthesized successfully through electrophilic substitution and Suzuki-Miyaura coupling. Then a series of polyimides were prepared with these diamines and 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA). All polyimides exhibited glass transition temperatures of 318–351 °C, excellent optical transmittances of 82.5–85.9 % at 400 nm, and low dielectric constants of 2.30–2.65 at 11 GHz. And they showed good solubility and hydrophobicity. The PI-5 exhibited the best dielectric properties with a dielectric constant of 2.30 and a dielectric loss of 0.0037 at 11 GHz, demonstrating promising application prospects in high-frequency communication.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"327 ","pages":"Article 128393"},"PeriodicalIF":4.1,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143822899","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

Unraveling the semi-interpenetration with conducting polymer of electroresponsive click-hydrogels made of hyaluronic acid via molecular dynamics simulations 通过分子动力学模拟揭示透明质酸电反应型咔嗒水凝胶与导电聚合物的半互穿

IF 4.1 2区化学

Polymer Pub Date : 2025-04-12 DOI: 10.1016/j.polymer.2025.128395

David Zanuy , Víctor Castrejón-Comas , Joel Sánchez-Morán , Adrian Fontana-Escartín , Marc Arnau , Maria M. Pérez-Madrigal , Carlos Alemán

{"title":"Unraveling the semi-interpenetration with conducting polymer of electroresponsive click-hydrogels made of hyaluronic acid via molecular dynamics simulations","authors":"David Zanuy , Víctor Castrejón-Comas , Joel Sánchez-Morán , Adrian Fontana-Escartín , Marc Arnau , Maria M. Pérez-Madrigal , Carlos Alemán","doi":"10.1016/j.polymer.2025.128395","DOIUrl":"10.1016/j.polymer.2025.128395","url":null,"abstract":"<div><div>Electroresponsive hydrogels have been prepared by semi-interpenetrating a hyaluronic acid-based click-hydrogel (clickHA) with different concentrations of poly(hydroxymethyl-3,4-ethylenedioxythiophene) (PEDOT-MeOH). The morphology of the resulting hydrogels, which showed excellent electrochemical response, consisted in a homogeneous distribution of PEDOT-MeOH nanoparticles decorating the pore well of the honeycomb-like clickHA hydrogel. In order to investigate this particular organization, atomistic molecular dynamics simulations have been conducted on clickHA hydrogels with and without hydroxymethyl-3,4-ethylenedioxythiophene (EDOT-MeOH) monomers. Results have shown that, while EDOT-MeOH molecules do not affect the physical and structural characteristics of clickHA, infiltrated monomers rapidly tend to aggregate inside the hydrogel, forming small clusters stabilized by π-π stacking interactions. These clusters probably act as polymerization nuclei for the formation of PEDOT-MeOH nanoparticles, which explains not only the morphology observed but also the remarkable electrochemical response of clickHA/PEDOT-MeOH hydrogels.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"327 ","pages":"Article 128395"},"PeriodicalIF":4.1,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143824829","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

Efficient synthesis of polyethylene wax using 8-(arylimino)-5,6,7-trihydroquinoline SiO2-supported heterogeneous nickel catalysts 8-(arylimino)-5,6,7-三氢喹啉sio2负载非均相镍催化剂高效合成聚乙烯蜡

IF 4.1 2区化学

Polymer Pub Date : 2025-04-12 DOI: 10.1016/j.polymer.2025.128367

Shan Xu , Hu Xu , Mengna Lei , Hu Xue , Pei Li , Chao Li , Ao Chen , Fuzhou Wang

{"title":"Efficient synthesis of polyethylene wax using 8-(arylimino)-5,6,7-trihydroquinoline SiO2-supported heterogeneous nickel catalysts","authors":"Shan Xu , Hu Xu , Mengna Lei , Hu Xue , Pei Li , Chao Li , Ao Chen , Fuzhou Wang","doi":"10.1016/j.polymer.2025.128367","DOIUrl":"10.1016/j.polymer.2025.128367","url":null,"abstract":"<div><div>In this contribution, a series of nickel complexes based on 8-(arylimino)-5,6,7-trihydroquinoline (<strong>Ni1</strong>–<strong>Ni4</strong>) were designed and synthesized. These complexes exhibited high activity of up to 9.0 × 10<sup>6</sup> g PE/mol Ni·h<sup>−1</sup> in ethylene polymerization on treatment with of Et<sub>2</sub>AlCl and producing highly branched polyethylene wax (branching numbers range from 66 to 82/1000C). To further improve the performance of these nickel catalysts, the SiO<sub>2</sub>-supported catalyst of <strong>Ni4</strong> was prepared, which presented better performance compared to homogeneous systems. Especially, the heterogeneous catalysts could further improve activity of up to 16.2 × 10<sup>6</sup> g PE/mol Ni·h<sup>−1</sup>, and thermal stability (activity of <strong>Ni4–Na@SiO<sub>2</sub></strong> up to 9.0 × 10<sup>6</sup> g PE/mol Ni·h<sup>−1</sup> at 75 °C) through ionic anchoring strategy. The morphology of polyethylene wax obtained by supported catalyst was also controllable. This work may provide an efficient and practical method for preparing polyethylene wax using late-transition metal catalysts.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"328 ","pages":"Article 128367"},"PeriodicalIF":4.1,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143824830","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

Rheology of ethylene-vinyl acetate composites tuned by crosslinked rubber particles and carbon nanotubes 通过交联橡胶颗粒和碳纳米管调节乙烯-醋酸乙烯酯复合材料的流变性能

IF 4.1 2区化学

Polymer Pub Date : 2025-04-12 DOI: 10.1016/j.polymer.2025.128400

Zhaopeng Hu , Xin Jiang , Benteng Liu , Qiao Li , Hongda Meng , Yihu Song , Yongzhong Bao , Qiang Zheng

{"title":"Rheology of ethylene-vinyl acetate composites tuned by crosslinked rubber particles and carbon nanotubes","authors":"Zhaopeng Hu , Xin Jiang , Benteng Liu , Qiao Li , Hongda Meng , Yihu Song , Yongzhong Bao , Qiang Zheng","doi":"10.1016/j.polymer.2025.128400","DOIUrl":"10.1016/j.polymer.2025.128400","url":null,"abstract":"<div><div>Rheology of polymer composites is crucial for production efficiency and performance of final products. Investigated here is influence of crosslinked rubber particles (CRPs) and carbon nanotubes (CNTs) on rheology of ethylene-vinyl acetate (EVA) composites. Transmission electron microscopy shows that CNTs are enriched in the EVA phase and do not penetrate into the CRPs. The reinforcement profiles of CRPs and CNTs are analyzed with the aid of time-concentration superposition principle, indicating that the reinforcement effects of these fillers are additive. While CNTs intensify and accelerate strain softening, CRPs are able to delay and weaken this effect. The synchronous evaluation of electrical resistance and rheology reveals that the conductive and rheological percolation networks are not entirely equivalent. The addition of CRPs improves elasticity and rheological and electrical recoveries of CNTs-based composites. The findings suggest that the combination of the two fillers synergistically improves composite properties, offering a foundation for optimizing advanced processing and application requirements.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"327 ","pages":"Article 128400"},"PeriodicalIF":4.1,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143824871","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 design of effective compatibilizers of a crystalline polymer Blend 结晶聚合物共混物有效增容剂的分子设计

IF 4.1 2区化学

Polymer Pub Date : 2025-04-11 DOI: 10.1016/j.polymer.2025.128385

Bailey Eberle, Timothy Taylor, Mark Dadmun

{"title":"Molecular design of effective compatibilizers of a crystalline polymer Blend","authors":"Bailey Eberle, Timothy Taylor, Mark Dadmun","doi":"10.1016/j.polymer.2025.128385","DOIUrl":"10.1016/j.polymer.2025.128385","url":null,"abstract":"<div><div>Managing the end-of-life of plastics is a challenging problem for a variety of reasons, including the complexity of recycling mixed waste streams. This is due to the inherent immiscibility of different polymers. One method to improve the properties of immiscible polymer pairs is through compatibilization. This study is designed to provide insight into the molecular mechanisms that result in the effective compatibilization of immiscible polymer blends that contain crystalline polymers, as crystalline polymers are a dominant fraction of the waste stream. In this study, the immiscible polymer pair examined contains polyvinyl chloride (PVC) and a polyolefin, as this pair of polymers is difficult to sort and make up a significant portion of commercial polymers in the waste stream. In these studies, the strength of the interface between amorphous poly(vinyl) chloride (PVC) and semicrystalline polyolefin elastomer (POE) compatibilized with chlorinated polyethylene (c-PE) are monitored as well as the strength of the interface between each homopolymer-compatibilizer pair. The results of this research show improvement in the interfacial adhesion at the c-PE/POE, c-PE/PVC and PVC/c-PE/POE interfaces as the blockiness of c-PE increases, which is interpreted to indicate that the entanglement of the compatibilizer with both the amorphous and semicrystalline phases is necessary to effectively compatibilize the biphasic interface. Further DSC, SAXS, and WAXS data provide evidence that semicrystalline compatibilizers can co-crystallize with the polyolefin elastomers, indicating that the co-crystallization can further strengthen the biphasic interface. Thus, this research provides insight into the molecular design of effective compatibilizers and the molecular level mechanisms that occur in compatibilized phase separated amorphous/crystalline polymer blends.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"327 ","pages":"Article 128385"},"PeriodicalIF":4.1,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143819624","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

Dual dynamic bonds enable biocompatible polyurethane hydrogels with superior toughness, fatigue and puncture resistance, pH-reversibility, and room-temperature self-healability 双动态键使生物相容性聚氨酯水凝胶具有优异的韧性、抗疲劳和抗穿刺性、ph可逆性和室温自愈性

IF 4.1 2区化学

Polymer Pub Date : 2025-04-11 DOI: 10.1016/j.polymer.2025.128381

Enhao Zheng , Peikai Zhang , Jilan Wang , Yongkang Chen , Haoxin Liu , Jing Xu , Zhaosheng Hou

{"title":"Dual dynamic bonds enable biocompatible polyurethane hydrogels with superior toughness, fatigue and puncture resistance, pH-reversibility, and room-temperature self-healability","authors":"Enhao Zheng , Peikai Zhang , Jilan Wang , Yongkang Chen , Haoxin Liu , Jing Xu , Zhaosheng Hou","doi":"10.1016/j.polymer.2025.128381","DOIUrl":"10.1016/j.polymer.2025.128381","url":null,"abstract":"<div><div>Intelligent hydrogels with remarkable mechanical properties and biocompatibility have significant potential in biomedical applications. However, preparing such hydrogels often involves a complex synthesis process, presenting a considerable challenge. This study developed a new polyurethane hydrogel (NPUG) using a simple pre-polymerization and solvent-exchange strategy through the synergistic combination of covalent acylhydrazone bond and noncovalent H-bond crosslinking. Due to the dual-crosslinked structures, the fabricated NPUG hydrogels possessed commendable tensile and compressive properties, with NPUG−III exhibiting tensile stress of 95.1 kPa, tensile elongation of 686.0 %, fracture toughness of 336.0 kJ m<sup>−3</sup>, and compressive stress of 214.0 kPa (under 90 % compressive deformation). Meanwhile, the NPUG hydrogels displayed exceptional fatigue resistance, shape-recovery capacities, and puncture resistance as evidenced by cyclic tensile, cyclic compression, and puncture testing. The dual dynamic reversible bonds conferred the hydrogels with high self-healing efficiency (up to 97.5 % after autogenous healing at room temperature for 2.0 h) and repeated pH-responsive gel−sol transition capacities. Furthermore, cytotoxicity evaluations (cell viability >90 %) and hemolysis tests (hemolysis ratio <3.5 %) confirmed the excellent biocompatibility of the hydrogels. Hence, the dual dynamically crosslinked hydrogels, characterized by their high toughness, fatigue resistance, puncture resistance, pH-reversibility, room-temperature self-healing, and biocompatibility, represent promising candidates for various bioengineering applications.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"327 ","pages":"Article 128381"},"PeriodicalIF":4.1,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143819626","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

Polypropylene-based phase change films with enhanced optical properties achieved by hydrophilic coating for remarkable cooling performance 聚丙烯基相变膜具有增强的光学性能，通过亲水性涂层获得了显著的冷却性能

IF 4.1 2区化学

Polymer Pub Date : 2025-04-11 DOI: 10.1016/j.polymer.2025.128364

Xinlong Wang , Xinpeng Hu , Zhanjin Shi , Xianrong Huang , Xiang Lu , Jinping Qu

{"title":"Polypropylene-based phase change films with enhanced optical properties achieved by hydrophilic coating for remarkable cooling performance","authors":"Xinlong Wang , Xinpeng Hu , Zhanjin Shi , Xianrong Huang , Xiang Lu , Jinping Qu","doi":"10.1016/j.polymer.2025.128364","DOIUrl":"10.1016/j.polymer.2025.128364","url":null,"abstract":"<div><div>Heat waves, increasing in frequency, pose significant risks to human health and economic stability. Traditional personal cooling technologies, such as Heating Ventilation and Air Conditioning (HVAC) systems, are energy-intensive and contribute to greenhouse gas emissions, necessitating the development of energy-efficient alternatives. Radiative cooling fabrics (RCFs) could be an ideal method for personal thermal management, while conventional petroleum-based fabrics exhibit low reflectivity and emissivity, limiting their cooling performance. This research introduces hybrid cooling films by incorporating phase change capsules (PCCs) into polypropylene (PP) films treated with a lysozyme-phytic acid coating to enhance hydrophilicity. The resulting RCFs demonstrated significantly improved reflectivity, emissivity and a high latent heat of 108.63 J/g, achieving a cooling performance of 4.62 °C. These findings highlight a scalable approach for manufacturing advanced textiles, contributing to more efficient thermal management strategies in response to rising global temperatures.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"327 ","pages":"Article 128364"},"PeriodicalIF":4.1,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143819627","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

Crystallization behavior and morphology of propylene-ethylene copolymers: tailoring properties by molecular catalysis 丙烯-乙烯共聚物的结晶行为和形态：分子催化裁剪性能

IF 4.1 2区化学

Polymer Pub Date : 2025-04-11 DOI: 10.1016/j.polymer.2025.128394

Angelo Giordano , Anna Perfetto , Miriam Scoti , Fabio De Stefano , Giovanni Talarico , Dario Liguori , Fabrizio Piemontesi , Rocco Di Girolamo , Claudio De Rosa

{"title":"Crystallization behavior and morphology of propylene-ethylene copolymers: tailoring properties by molecular catalysis","authors":"Angelo Giordano , Anna Perfetto , Miriam Scoti , Fabio De Stefano , Giovanni Talarico , Dario Liguori , Fabrizio Piemontesi , Rocco Di Girolamo , Claudio De Rosa","doi":"10.1016/j.polymer.2025.128394","DOIUrl":"10.1016/j.polymer.2025.128394","url":null,"abstract":"<div><div>Random propene-ethylene copolymers were synthesized in the whole range of comonomer composition from 0.4 to 84 wt% of ethylene (C2) with an isospecific metallocene catalyst. For some samples, the catalyst was supported on suitable supports. The crystallization behavior and morphology have been analyzed and correlated with the mechanical properties. Copolymers with low C2 concentration up to 16 wt% crystallize in α or γ forms of isotactic polypropylene (iPP), whereas copolymers with high C2 concentration from 65 to 84 wt% crystallize in the orthorhombic form of polyethylene (PE) and samples with C2 concentration from 26 to 60 wt% are amorphous. The high molecular mass and the uniform comonomer concentration in the whole composition range achieved thanks to the utilized synthetic strategy based on the use of a metallocene catalyst, have allowed production of materials with mechanical properties ranging from high stiffness and strength to high flexibility and ductility, to remarkable elasticity. Elastic properties develop for C2 concentrations from 14 to 16 wt% in samples showing iPP crystallinity and from 60 to 75 wt% in samples showing PE crystallinity. The mechanical properties and elastic behavior have been explained and correlated with the crystallization behavior and crystal morphology. In particular, the experimental values of stress at yielding have been correlated with the values of thickness of crystalline lamellae, estimated from the small-angle X-ray scattering (SAXS) data, whereas the observed elastic properties have been explained by the revealed interwoven crystal morphology.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"327 ","pages":"Article 128394"},"PeriodicalIF":4.1,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143819621","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