Journal of Polymer Science最新文献_第8页

Melt-functionalization of cellulose nanocrystals using dynamic hindered ureas 使用动态受阻脲类对纤维素纳米晶体进行熔融功能化处理

IF 3.9 3区化学

Journal of Polymer Science Pub Date : 2024-07-25 DOI: 10.1002/pol.20240452

Zehra Oluz, Nicholas Macke, Sarah Candelaria, Abrianna Ambus, Aurora Zemborain, Chinwe S. Udemgba, Adam M. Weiss, Céline Calvino, Stuart J. Rowan

{"title":"Melt-functionalization of cellulose nanocrystals using dynamic hindered ureas","authors":"Zehra Oluz, Nicholas Macke, Sarah Candelaria, Abrianna Ambus, Aurora Zemborain, Chinwe S. Udemgba, Adam M. Weiss, Céline Calvino, Stuart J. Rowan","doi":"10.1002/pol.20240452","DOIUrl":"10.1002/pol.20240452","url":null,"abstract":"Cellulose nanocrystal (CNC)-reinforced composites are gaining commercial attention on account of their high strength and sustainable sourcing. Grafting polymers to the CNCs in these composites has the potential to improve their properties, but current solution-based synthesis methods limit their production at scale. Utilizing dynamic hindered urea chemistry, a new method for the melt-functionalization of cellulose nanocrystals has been developed. This method does not require toxic solvents during the grafting step and can achieve grafting densities competitive with state-of-the-art solution-based grafting methods. Using cotton-sourced, TEMPO-oxidized CNCs, multiple molecular weights of poly(ethylene glycol) (PEG) as well as dodecane, polycaprolactone, and poly(butyl acrylate) were grafted to the CNC surface. With PEG-grafted nanoparticles, grafting densities of 0.47 chains nm−2 and 0.10 chains nm−2 were achieved with 2000 and 10,000 g mol−1 polymer chains respectively, both of which represent significant improvements over previous reports for solution-based PEG grafting onto CNCs.","PeriodicalId":16888,"journal":{"name":"Journal of Polymer Science","volume":"62 20","pages":"4676-4686"},"PeriodicalIF":3.9,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/pol.20240452","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141771125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Influence of amine chain extenders on morphology and performances of poly(dimethylsiloxane) based poly(urea-urethane) elastomers 胺链扩展剂对基于聚（二甲基硅氧烷）的聚（脲-聚氨酯）弹性体的形态和性能的影响

IF 3.9 3区化学

Journal of Polymer Science Pub Date : 2024-07-25 DOI: 10.1002/pol.20240438

Shang Ge, Youzhi Zhu, Yun Zhu, Guiyou Wang, Guoming Chen, Shihong Liu, Ping Ye

{"title":"Influence of amine chain extenders on morphology and performances of poly(dimethylsiloxane) based poly(urea-urethane) elastomers","authors":"Shang Ge, Youzhi Zhu, Yun Zhu, Guiyou Wang, Guoming Chen, Shihong Liu, Ping Ye","doi":"10.1002/pol.20240438","DOIUrl":"10.1002/pol.20240438","url":null,"abstract":"The structure, morphology, and performance of polyurethanes are greatly influenced by the structure of chain extenders. In this study, two types of amine chain extenders, 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane (BAPD) and isophorone diamine (IPDA), were utilized in the synthesis of poly(dimethylsiloxane) (PDMS)-based poly(urea-urethane) elastomers (PDMS-PUUs). The mechanical properties, morphology, and in vitro oxidative stability of the as-prepared elastomers were controlled by altering the ratio of BAPD and IPDA. The results indicate that the overall phase mixing of PDMS-PUUs improves after incorporating of BAPD into the hard segments. The hard segment, composed of IPDA with a rigid structure, plays a crucial role in maintaining the essential mechanical properties of the PDMS-PUUs. Furthermore, PDMS-PUUs based on mixed chain extenders exhibit relatively high boundary diffuseness and boundary thickness. Especially, the PDMS-PUU sample synthesized from BAPD and IPDA with a molar ratio of 1/1 features the highest boundary diffuseness (0.094) and boundary thickness (0.395 nm), consequently displaying some remarkable properties, including enhanced cyclic tensile properties, superior strain recovery (92.6%), a low modulus (8.6 MPa), and high tensile strength (20.3 MPa). PDMS-PUUs also exhibit good oxidative stability and biocompatibility, implying that the as-prepared PDMS-PUUs are proven to be biostable and capable of long-term implantation.","PeriodicalId":16888,"journal":{"name":"Journal of Polymer Science","volume":"62 20","pages":"4659-4675"},"PeriodicalIF":3.9,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141771122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Development of a quaternary photocurable system for 3D printing based on the addition of acrylate monomers to an epoxy/thiol-Ene system 在环氧树脂/硫醇-炔体系中添加丙烯酸酯单体，开发用于 3D 打印的季化合物光固化体系

IF 3.9 3区化学

Journal of Polymer Science Pub Date : 2024-07-24 DOI: 10.1002/pol.20240366

Ricardo Acosta Ortiz, Alan Isaac Hernandez Jiménez, José de Jesus Ku Herrera, Alejandro May Pat

{"title":"Development of a quaternary photocurable system for 3D printing based on the addition of acrylate monomers to an epoxy/thiol-Ene system","authors":"Ricardo Acosta Ortiz, Alan Isaac Hernandez Jiménez, José de Jesus Ku Herrera, Alejandro May Pat","doi":"10.1002/pol.20240366","DOIUrl":"10.1002/pol.20240366","url":null,"abstract":"The exothermic nature of acrylate photopolymerizations enables room temperature 3D printing of a quaternary formulation that incorporates an acrylate monomer, and an epoxy/thiol-ene system (ETES). The latter comprises an epoxy monomer, a multifunctional thiol and a tetraallyl functionalized ditertiary amine curing agent. Pristine ETES necessitates temperatures of 85–95 °C for curing. Several mechanisms operate simultaneously during this process: homopolymerization of acrylates, thiol-acrylate photopolymerization, thiol-ene photopolymerization between the double bonds of curing agent and the multifunctional thiol, the Michael addition between thiolates derived from ETES and the double bonds of acrylates, and the anionic polymerization of the epoxy resin via the tertiary amine groups. To optimize the quaternary formulations for printing, parameters, such as reactivity, exothermicity, and viscosity, was explored. Subsequently, the thermal and viscoelastic properties of the printed cross-linked polymers derived from these formulations were analyzed using Differential Scanning Calorimetry (DSC), Dynamic Mechanical Analysis (DMA) and Thermogravimetric Analysis (TGA). The polymers derived from quaternary formulations exhibited lower crosslinked density compared to those obtained from the pristine acrylates. This reduction in crosslink density contributes to the improved toughness of the hybrid polymers.","PeriodicalId":16888,"journal":{"name":"Journal of Polymer Science","volume":"62 20","pages":"4642-4658"},"PeriodicalIF":3.9,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141771124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Cellulose acetate synthesized from cold-sheared cellulose shows improved ability to toughen poly(lactic acid) 由冷剪切纤维素合成的醋酸纤维素显示出更强的聚乳酸增韧能力

IF 3.9 3区化学

Journal of Polymer Science Pub Date : 2024-07-24 DOI: 10.1002/pol.20240364

Koki Akiyama, Tomonori Koda, Akihiro Nishioka, Yoshimasa Matsumura, Bungo Ochiai

引用次数: 0

Moisture barriers used in firefighters' protective clothing: Effect of accelerated hydrothermal aging on their mechanical and barrier performance 消防员防护服中使用的防潮层：加速水热老化对其机械和阻隔性能的影响

IF 3.9 3区化学

Journal of Polymer Science Pub Date : 2024-07-23 DOI: 10.1002/pol.20240147

Laura Munevar-Ortiz, John A. Nychka, Patricia I. Dolez

{"title":"Moisture barriers used in firefighters' protective clothing: Effect of accelerated hydrothermal aging on their mechanical and barrier performance","authors":"Laura Munevar-Ortiz, John A. Nychka, Patricia I. Dolez","doi":"10.1002/pol.20240147","DOIUrl":"10.1002/pol.20240147","url":null,"abstract":"Firefighters' protective clothing rely on moisture barriers to safeguard against liquid ingress while enabling sweat evaporation for comfort and safety. However, these moisture barriers can degrade over time, jeopardizing firefighters' safety. Existing evaluation methods, primarily visual inspection, are inadequate for assessing moisture barrier integrity in service. This study examines the effect of accelerated hydrothermal aging on the tear force, water vapor transmission rate (WVTR), and apparent contact angle in three moisture barrier models used in firefighter protective clothing. The moisture barriers studied varied in composition, structure, and base fabric fiber content. Results revealed that moisture barriers' responses to aging are influenced by factors, such as fabric structure, adhesive configuration, finish, and the presence of additional coatings. The hardening of the adhesive layer between the ePTFE membrane and the base fabric was observed in two of the moisture barriers, leading to a slight tear force reduction. Two of the moisture barriers also experienced crack and pit formation on the membrane side, which affected the WVTR. The water-repellent finish on the fabric side degraded in one moisture barrier. Understanding these complex behaviors is essential for predicting the long-term moisture barrier performance and enhancing firefighter safety.","PeriodicalId":16888,"journal":{"name":"Journal of Polymer Science","volume":"62 20","pages":"4612-4631"},"PeriodicalIF":3.9,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/pol.20240147","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141771126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Photopolymerization of polyvinylethylene glycol oligomers by thiol-ene click reaction 通过硫醇-烯点击反应实现聚乙烯乙二醇低聚物的光聚合反应

IF 3.9 3区化学

Journal of Polymer Science Pub Date : 2024-07-19 DOI: 10.1002/pol.20240441

Fan Yang, Minghang Wang, Yong Jian Zhang

引用次数: 0

Poly(vinyl alcohol)/polyacrylamide double-network ionic conductive hydrogel strain sensor with high sensitivity and high elongation at break 具有高灵敏度和高断裂伸长率的聚乙烯醇/聚丙烯酰胺双网络离子导电水凝胶应变传感器

IF 3.9 3区化学

Journal of Polymer Science Pub Date : 2024-07-19 DOI: 10.1002/pol.20240209

Zijian Wu, Xiaorui Liu, Qi Xu, Liying Zhang, Safaa N. Abdou, Mohamed M. Ibrahim, Jing Zhang, Zeinhom M. El-Bahy, Ning Guo, Junguo Gao, Ling Weng, Zhanhu Guo

{"title":"Poly(vinyl alcohol)/polyacrylamide double-network ionic conductive hydrogel strain sensor with high sensitivity and high elongation at break","authors":"Zijian Wu, Xiaorui Liu, Qi Xu, Liying Zhang, Safaa N. Abdou, Mohamed M. Ibrahim, Jing Zhang, Zeinhom M. El-Bahy, Ning Guo, Junguo Gao, Ling Weng, Zhanhu Guo","doi":"10.1002/pol.20240209","DOIUrl":"10.1002/pol.20240209","url":null,"abstract":"As a soft material with biocompatibility and stimulation response, ionic conductive hydrogel-based wearable strain sensors show great potential across a wide spectrum of engineering disciplines, but their mechanical toughness is limited in practical applications. In this study, freeze-thawing techniques were utilized to fabricate double-network hydrogels of poly(vinyl alcohol)/polyacrylamide (PVA/PAM) with both covalent and physical cross-linking networks. These double-network hydrogels demonstrate excellent mechanical performance, with an elongation at break of 2253% and tensile strength of 268.2 kPa. Simultaneously, they also display a high sensitivity (Gage factor, GF = 2.32 at 0%–200% strain), achieve a rapid response time of 368 ms without the addition of extra conductive fillers or ions, stable signal transmission even after multiple cycles, and fast response to human motion detection.","PeriodicalId":16888,"journal":{"name":"Journal of Polymer Science","volume":"62 20","pages":"4599-4611"},"PeriodicalIF":3.9,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/pol.20240209","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141738514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Effect of PHBV-g-MA compatibilizer on the properties of poly(3-hydroxybutyrate-co-3-hydroxyvalerate)/polylactide blend/Diss fibers biocomposites PHBV-g-MA 相容剂对聚（3-羟基丁酸-3-羟基戊酸）/聚乳酸混合物/Diss 纤维生物复合材料性能的影响

IF 3.9 3区化学

Journal of Polymer Science Pub Date : 2024-07-19 DOI: 10.1002/pol.20240406

Brahim Remila, Idris Zembouai, Lynda Zaidi, Arezki Alane, Kattia Yalaoui, Mustapha Kaci, Antoine Kervoelen, Stéphane Bruzaud

{"title":"Effect of PHBV-g-MA compatibilizer on the properties of poly(3-hydroxybutyrate-co-3-hydroxyvalerate)/polylactide blend/Diss fibers biocomposites","authors":"Brahim Remila, Idris Zembouai, Lynda Zaidi, Arezki Alane, Kattia Yalaoui, Mustapha Kaci, Antoine Kervoelen, Stéphane Bruzaud","doi":"10.1002/pol.20240406","DOIUrl":"10.1002/pol.20240406","url":null,"abstract":"This study investigates the morphology and properties of biocomposites based on a blend of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and poly (lactic acid) (PLA) 50/50 (w/w) reinforced with untreated (UNDF) and alkali-treated (ATDF) Diss (Ampelodesmos mauritanicus) fibers at 20 wt. %. Moreover, PHBV-g-MA used as the compatibilizer was added at 5 wt. % to the alkali-treated biocomposites. Morphology, and crystallinity, thermal, thermo-mechanical, rheological and mechanical properties of PHBV/PLA biocomposites were studied. The study showed that the treated Diss fibers were uniformly dispersed in both PLA and PHBV phases. This results in a good interfacial adhesion between the components, as observed by scanning electron microscopy (SEM). Further, the results also indicated that the compatibilized biocomposite samples showed an enhancement in crystallinity degree and heat deflection temperature (HDT) passing from 48.7% to 62.4% and 119.2 to 132.9°C, respectively, in comparison with the neat blend. Similar trend is also observed with the tensile data indicating a significant increase in Young's modulus by almost 48.5% compared to PHBV/PLA matrix. This is due to better interactions between Diss fibers and PHBV/PLA matrix. The results suggest the occurrence of a synergistic effect between PHBV-g-MA and alkali-treated Diss fibers in the development of materials with interesting properties and could be a potential means to expand their applications.","PeriodicalId":16888,"journal":{"name":"Journal of Polymer Science","volume":"62 20","pages":"4587-4598"},"PeriodicalIF":3.9,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141738513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 pyrimidine-cored covalent organic frameworks for heavy metal removal 用于去除重金属的嘧啶芯共价有机框架的制备与表征

IF 3.9 3区化学

Journal of Polymer Science Pub Date : 2024-07-17 DOI: 10.1002/pol.20240458

Heping Wang, Qian Ma, Yunxia Wang, Rui Li, Jiahuan Fu, Qiuhong Bai

引用次数: 0

Synthesis of isotope-substituted conjugated ladder polymers 同位素取代共轭梯形聚合物的合成

IF 3.9 3区化学

Journal of Polymer Science Pub Date : 2024-07-17 DOI: 10.1002/pol.20240418

Mingwan Leng, Zhiqiang Cao, Guorong Ma, Yirui Cao, Megan Hays, Xiaodan Gu, Lei Fang

{"title":"Synthesis of isotope-substituted conjugated ladder polymers","authors":"Mingwan Leng, Zhiqiang Cao, Guorong Ma, Yirui Cao, Megan Hays, Xiaodan Gu, Lei Fang","doi":"10.1002/pol.20240418","DOIUrl":"10.1002/pol.20240418","url":null,"abstract":"Conjugated ladder polymers (cLPs) represent an intriguing class of macromolecules, characterized by their multi-stranded structure, with continuous fused π-conjugated rings forming the backbone. Isotope substitution, such as deuteration and carbon-13 labeling, offers unique approaches to address the significant challenges associated with elucidating the structure and solution phase dynamics of these polymers. For instance, selective deuteration can highlight parts of the polymer by controlling the scattering length density of specific molecular sections, thereby enhancing the contrast for neutron scattering experiments. In this context, deuteration of side-chains in cLPs represents a promising approach to uncover the elusive polymer physics properties of their backbone. The synthesis of two distinct types of cLPs with perdeuterated side-chains are reported here. During the synthesis, 13C isotope labeling was also employed to verify the low levels of defects in the synthesized polymers. Demonstrating these synthetic successes lays the foundation for rigorous characterization of the defects, conformation, and dynamics of cLPs.","PeriodicalId":16888,"journal":{"name":"Journal of Polymer Science","volume":"62 19","pages":"4538-4545"},"PeriodicalIF":3.9,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/pol.20240418","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141719812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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