Polymer最新文献

{"title":"Preparation and molecular simulation of hyper-dispersant modified BN filled natural rubber thermally conductive composite","authors":"Zhen Wang, Zhenlu Li, Xinfeng Lin, Long Zheng, Ziwei Li, Shaorong Lu","doi":"10.1016/j.polymer.2024.127935","DOIUrl":"https://doi.org/10.1016/j.polymer.2024.127935","url":null,"abstract":"Non-covalent modification of fillers with hyperdispersants in composite processing avoids destroying the regular structure of the filler and is simpler and easier to operate than ordinary surface modification methods. A novel hyperdispersant, GI-g-PHA, was synthesized by esterification of poly12-hydroxystearic acid (PHA) and glycerol (GI) to improve the thermal conductivity (TC) and tensile properties of natural rubber (NR)/boron nitride (BN) composites. After the addition of 5 wt% hyperdispersant, the thermal conductivity of 20 vol% and 25 vol% BN composites was 0.965 W/mK and 1.364 W/mK, respectively, which was 9.6 and 13.6 times higher than that of NR matrix (0.1 W/mK). Molecular dynamics simulations showed an increase in molecular binding energy and a decrease in free volume fraction after the addition of dispersant, which provided a microscopic explanation for the change in compatibility. This study provides a way to prepare polymer matrix composites with high thermal conductivity and high strength.","PeriodicalId":405,"journal":{"name":"Polymer","volume":"16 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142820607","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}

{"title":"Anomalous enhanced swelling of charged copolymer gels","authors":"Esli Diepenbroek, E. Stefan Kooij, Sissi de Beer","doi":"10.1016/j.polymer.2024.127934","DOIUrl":"https://doi.org/10.1016/j.polymer.2024.127934","url":null,"abstract":"Copolymer gels are a class of hydrogels that possess at least two different monomers within the same polymer chain. A common method for synthesizing copolymer gels is the one-pot free radical polymerization reaction. In charged copolymer gels, however, this fabrication method has previously led to anomalous, and often unexplained, material properties. In this paper, we report on the anomalous, enhanced swelling of anionic poly(3-sulfopropylmethacrylate-<em>co</em>-2-hydroxyethylmethacrylate) (P(SPMA-co-HEMA)) hydrogels, whereby we provide experimental results and a theoretical framework to explain this swelling behavior. The swelling ratio of our copolymer gels exhibits a local optimum at <span><span style=\"\"></span><span data-mathml='&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mo is=\"true\"&gt;&amp;#x223C;&lt;/mo&gt;&lt;/math&gt;' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"><svg aria-hidden=\"true\" focusable=\"false\" height=\"1.163ex\" role=\"img\" style=\"vertical-align: 0.307ex; margin-bottom: -0.427ex;\" viewbox=\"0 -449.1 778.5 500.8\" width=\"1.808ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"><g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><g is=\"true\"><use xlink:href=\"#MJMAIN-223C\"></use></g></g></svg><span role=\"presentation\"><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mo is=\"true\">∼</mo></math></span></span><script type=\"math/mml\"><math><mo is=\"true\">∼</mo></math></script></span> 25 mol% SPMA before transiting into a linear trend between charge density and gel swelling. A kinetic study of P(SPMA-co-HEMA) copolymerization reactions revealed that a transition in copolymer architecture is taking place, from a gradient (0–50 mol%) to a random (50–100 mol%) chain character with increasing SPMA content. With Flory-Rehner’s theoretical framework, we investigate why this change in copolymer architecture leads to enhanced swelling. For gradient copolymer gels, the difference in charge distribution likely enhances the local ionic driving force, and herewith the swelling. With the ability to tune the swelling behavior by controlling the copolymer architecture, we open further possibilities to study architecture-dependent properties, such as visco-elastic and stimuli-responsive behavior, or pH- and salt-dependent swelling.","PeriodicalId":405,"journal":{"name":"Polymer","volume":"142 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142820606","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}

{"title":"Revealing the role of molecular weight on mechanical reinforcement of highly oriented UHMWPE fibers","authors":"Jinghan Wu, Tianhao Yang, Ke Wang, Qin Zhang, Qiang Fu","doi":"10.1016/j.polymer.2024.127953","DOIUrl":"https://doi.org/10.1016/j.polymer.2024.127953","url":null,"abstract":"It has been well known that increasing the molecular weight of ultra-high weight polyethylene (UHMWPE) has a positive effect on obtaining high-strength fibers, but the structural advantages brought by such event still lack clear-cut verification. This study selects fibers with different molecular weights (MW) and investigates the trend of structure and property changes by controlling the draw ratio (DR) and temperature during hot drawing process. The results show that all fibers can achieve saturation of orientation with the increase of DR, but the strength of the higher MW fiber is significantly larger than that of the low MW ones. Meanwhile, the higher MW brings more shish content and longer shish length. Because higher molecular weight means fewer chain end defects, which has benefit for the formation of continuous shish crystals. As adjusting the shish content and length by means of changing DR and operation temperature, the positive correlations between strength and shish content or shish length are found. Therefore, the effect of MW on strength is due to changes in the crystalline structure of fibers, especially shish content and length are key structural factors for inducing superior strength. This work provides a reference for achieving high-performance fibers through structural regulation.","PeriodicalId":405,"journal":{"name":"Polymer","volume":"3 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142816025","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}

{"title":"Dynamic borate ester bonds mediated patterned anisotropic hydrogels for information encryption","authors":"Zengbin Song, Zhaodi Yi, Mingrui Wu, Ming He","doi":"10.1016/j.polymer.2024.127952","DOIUrl":"https://doi.org/10.1016/j.polymer.2024.127952","url":null,"abstract":"Hydrogels with oriented structures exhibit birefringence and display different interference colors between crossed polarizers, which has attracted increasing attention in the fields of information encryption. However, it remains a challenge to introduce complex anisotropic microstructures into hydrogels and enabling them to display high-resolution interference patterns with erasable and rewritable properties. In this study, we report a uniaxially oriented anisotropic polyvinyl alcohol (PVA) hydrogel mediated by dynamic borate ester bonds. Different high-resolution interference patterns can be written or transfer-printed quickly by disrupting the localized PVA-B(OH)₄⁻complex structures with HCl solution. The reversible formation and dissociation of the PVA-B(OH)₄⁻ complex structures allow the interference pattern to be repeatedly erased and rewritten. The excellent stability of the crystalline domains of PVA confers the ability for reversible transformation between hydrogel and dry film states without compromising the accuracy and reliability of the pattern information. The created dry film with a fingerprint pattern can be used to assemble an unforgeable card, which can instantly display a fingerprint pattern in front of a cell phone screen. Double encryption of the patterned information was achieved by drying the patterned hydrogel into a curly shape and utilizing its three-dimensional structure to increase the security of the information.","PeriodicalId":405,"journal":{"name":"Polymer","volume":"28 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142809506","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}

{"title":"The Role of Annealing on The Properties and Microstructure of Amorphous/Crystalline PPESK/PEKK System","authors":"Yuxi Pan, Xiaotong Pan, Danhui Wang, Jiangjiang Zhang, Cheng Liu, Wenguang Zeng, Yujie Guo, Xigao Jian","doi":"10.1016/j.polymer.2024.127928","DOIUrl":"https://doi.org/10.1016/j.polymer.2024.127928","url":null,"abstract":"Poly(phthalazinone aryl ether)s as an emerging polyarylene ether resin, has received great attention in many fields. The effects of annealing temperature and time on the PPESK (Poly(phthalazinone ether sulfone ketone))/PEKK (polyetherketone ketone) system were studied in this paper. It was found that with the increase of annealing temperature and time, the PEKK molecular chains moved and inserted into the rigid large free-volume PPESK molecular chain voids and formed lamellae inside PPESK chains during annealing. SAXS (small angle X-ray scattering) results show that annealing increases the lamellae thickness of the PEKK component, and AFM (atomic Force Microscope) results visually confirm the suppose that the PEKK molecular chain movement insert into the PPESK molecular chain voids and crystallizes. The tensile and flexural properties of B1806 (annealing at 180°C for 360 mins) specimen are improved by 17.8% and 13.8%, respectively, compared with the unannealed specimens. The results suggest that the best annealing addition is 180 °C with 360 mins for performance enhancement.","PeriodicalId":405,"journal":{"name":"Polymer","volume":"14 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142809890","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}

{"title":"Cis-Trans Isomerism-Driven Thermal and Phase Transitions in Oleic and Elaidic Acids and Their Derived Polymers","authors":"Minghao Wang, Haomin Yu, Jiawei Jiang, Wencong Xu, Guofeng Xu, Si Wu","doi":"10.1016/j.polymer.2024.127954","DOIUrl":"https://doi.org/10.1016/j.polymer.2024.127954","url":null,"abstract":"Cis-trans isomerism plays a crucial role in regulating the thermal properties and phase transitions of materials, which is essential for the development of advanced functional materials. By influencing melting points and glass transition temperatures, cis-trans isomerism enables precise control over material performance in applications such as thermal sensors, self-healing coatings, thermal sensors, and temperature-responsive films. Here we report the impact of cis-trans isomerism in double bonds on the thermal and phase transitions of oleic acid (OA) and elaidic acid (EA) and their derived polymers, with a focus on glass transition temperature (<em>T</em>_<em>g</em>) and melting point (<em>T</em>_<em>m</em>). A series of molecules and copolymers with varying cis and trans double bond ratios are synthesized to examine how these isomeric configurations affect thermal behavior. Thermal and structural properties are characterized using differential scanning calorimetry (DSC) and nuclear magnetic resonance (NMR) spectroscopy. The results show a clear correlation between isomeric composition and the polymers' <em>T</em>_<em>g</em> and <em>T</em>_<em>m</em>, illustrating that the incorporation of cis-trans isomers can be effectively used to fine-tune thermal properties. This research offers valuable insights into the design of advanced polymeric materials with tailored thermal characteristics, paving the way for applications in various high-performance sectors.","PeriodicalId":405,"journal":{"name":"Polymer","volume":"28 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142809505","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}

{"title":"SEPS Elastomer-induced β-Crystallization and the Role of Isothermal Crystallization on Enhancing the Low-Temperature Toughness of Polypropylene","authors":"Jiayi Wang, Wenwen Yu, Zhiyi Zhang, Jiahao Shen, Ruimiao Liang, Xiaotian Nan, Fuyong Liu, Fengbo Zhu, Yonggang Shangguan, Qiang Zheng","doi":"10.1016/j.polymer.2024.127948","DOIUrl":"https://doi.org/10.1016/j.polymer.2024.127948","url":null,"abstract":"In the quest to develop high-performance polypropylene (PP) blends with enhanced toughness, a blend was prepared by integrating poly(styrene-ethylene/propylene-styrene) (SEPS), which functions not only as an elastomer but also as a <em>β</em>-nucleating agent. The dispersion with a smaller interparticle distance of SEPS and its formation of an entangled network within PP significantly enhance the material’s toughness, shifting the brittle-ductile transition temperature to lower values. Under natural cooling conditions, only a low amount of <em>β</em>-crystals forms. However, isothermal crystallization of PP with only elastomer added leads to a substantial increase in the quantity and aggregation of <em>β</em>-spherulites, resulting in enhanced intercrystalline connectivity and the development of “flower”-like aggregates. This unique microstructure, facilitated by SEPS, is highly effective in stress transfer and impact energy absorption. After isothermal crystallization, the relative content of <em>β</em>-crystals increases significantly, from 9.00% to 29.55%, leading to a remarkable 89.95% increase in the impact strength of PP/SEPS blends at -10°C. Importantly, the <em>β</em>-crystals produced through isothermal crystallization with SEPS as a nucleating agent exhibit greater stability compared to those formed using other <em>β</em>-nucleating agents.","PeriodicalId":405,"journal":{"name":"Polymer","volume":"40 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142809660","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}

{"title":"Mechanically robust and rapid room temperature self-healing waterborne polyurethane with three cross-linking networks based on triple dynamic bonds","authors":"Haonan Chen, Yong Jin, Rong Zhou, Jiangyang Mei, Zhexian Mao, Qipeng Liang","doi":"10.1016/j.polymer.2024.127949","DOIUrl":"https://doi.org/10.1016/j.polymer.2024.127949","url":null,"abstract":"Although the research on self-healing waterborne polyurethane has been relatively in-depth, accomplishing rapid self-healing at room temperature along with superior mechanical properties remains a substantial challenge. Herein, a three cross-linking waterborne polyurethane (TeWPU-Zn-x) with triple dynamic bonds was prepared by adding ditellurium glycol, isophorone diamine, and trimethylolpropane to the backbone of the waterborne polyurethane, forming coordination bonds between carboxyl groups on the backbone of the waterborne polyurethane and zinc ions. Owing to the cooperative action of three distinct types of cross-linking and triple dynamic bonds, the film of TeWPU-Zn-3 exhibits outstanding mechanical features (the tensile strength, 40.58 MPa; the fracture toughness, 20.75 MJ m²; the elongation at break, 629.15%) and a remarkable self-healing efficiency (89.43% under a trace amount of ethanol induction and visible light irradiation at room temperature for a duration of 2 hours) simultaneously, demonstrating an exceptional balance between mechanical robustness and rapid room temperature self-healing, whose two characteristics outperforms those of the self-healing waterborne polyurethane reported so far. After reprocessing, the TeWPU-Zn-3 film cut into particles is basically restored to its original state and the reprocessing film can easily weigh 5 kg dumbbells. Moreover, due to the incorporation of zinc ions and ditellurium bonds, TeWPU-Zn-3 film is endowed with good antibacterial properties (S. aureus, 99.3%; E. coli, 97.5%). Importantly, when used as leather coating, TeWPU-Zn-3 also shows a protective self-healing ability on the leather. In summary, this work provides a promising avenue for the creation of waterborne polyurethane distinguished by their superior mechanical attributes, rapid room temperature self-healing, reprocess ability, and antibacterial properties.","PeriodicalId":405,"journal":{"name":"Polymer","volume":"50 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142809507","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}

{"title":"Platinum Embedded Conducting Polyaniline/Polyvinyl Hydrogel for Enhanced Glucose Biomolecule Detection","authors":"Leimapokpam Sophia Devi, Roy Paily, Ashok Kumar Dasmahapatra","doi":"10.1016/j.polymer.2024.127947","DOIUrl":"https://doi.org/10.1016/j.polymer.2024.127947","url":null,"abstract":"Conducting polymer hydrogels (CPHs) are ideal for biomolecule detection due to their porous structure allowing rapid diffusion of gases and liquids, along with their inherent conductivity, flexibility, and biocompatibility. However, their limited catalytic efficiency can be improved by incorporating noble metal nanoparticles (NMNPs), which enhance electron transfer, structural stability, and catalytic activity, making them more effective for applications in bioelectronics, sensors and related applications. Herein, we report the two terminal device with active channel formed by the incorporation of platinum nanoparticles into polyaniline-polyvinyl alcohol (Pt-NPs@PANI/PVA) hydrogel for glucose biomolecule detection. The structural and morphological characterization of Pt-NPs@PANI/PVA hydrogel confirmed the presence of Pt-NPs within the PANI-PVA hydrogel matrix. The sensor exhibited an enhanced electrical conductivity while showing the reduced hydrophilicity in presence of Pt-NPs. Though the sensor demonstrated the lesser liquid absorption compared to PANI/PVA hydrogel but conducted a significant current in DI water media. Furthermore, it also displayed the electrical responsiveness in tear fluid. The sensor response was measured for glucose biomolecule after functionalizing with glucose oxidase, (GOx) and preconditioning with DI water media. The sensor sensitivity to glucose was 7.364 μA/dec within the linear range 1μM-30 mM with the detection limit 0.44 μM. The sensor exhibited good reproducibility highlighting its potential for development of wearable sensors in various health care monitoring, aiming to provide a low cost, user friendly solution for glucose biomarker detection with promising applications in non-invasive health monitoring.","PeriodicalId":405,"journal":{"name":"Polymer","volume":"28 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142804764","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}

{"title":"Visualization of the lamellar structure of polyvinylidene fluoride using phase-plate scanning transmission electron microscopy","authors":"Mayu Togashi, Kousuke Sugeno, Yuki Tanaka, Toshiki Shimizu, Hiromu Saito, Hiroki Minoda","doi":"10.1016/j.polymer.2024.127946","DOIUrl":"https://doi.org/10.1016/j.polymer.2024.127946","url":null,"abstract":"Polyvinylidene fluoride (PVDF) is a crystalline polymer well-known for its excellent piezoelectric properties, flexibility, chemical resistance, heat resistance, and mechanical strength. PVDF exhibits crystal polymorphisms, with five reported crystal structures. Among these, the β-type structure has attracted much interest due to its superior piezoelectric properties; however, the details of its piezoelectric mechanism remain unclear. It is essential to evaluate the structure of PVDF at the nanoscale to elucidate its piezoelectric mechanism. In this study, as a first step toward elucidating its piezoelectric properties, we employed phase-plate scanning transmission electron microscopy (P-STEM) to observe heat-elongated PVDF. P-STEM is particularly effective in examining materials composed of light elements. We successfully visualized the lamellar structure, which was characterized by a layered arrangement of crystalline and amorphous regions. The period of the lamellar structure was approximately 7 nm, which was in good agreement with the results of small-angle X-ray scattering studies. In addition, high-magnification P-STEM images revealed that bundle-like structures oriented in the elongation direction were likely crystalline regions. This result indicates that P-STEM provides detailed local information regarding the orientation of the PVDF polymer chains.","PeriodicalId":405,"journal":{"name":"Polymer","volume":"21 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142797564","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}