二氧化硅表面功能化橡胶的界面偶联效率,Surfaces and Interfaces

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二氧化硅表面功能化橡胶的界面偶联效率,Surfaces and Interfaces

2024-07-17 06:51| 来源: 网络整理| 查看: 265

了解填料-聚合物在界面处的相互作用是橡胶增强材料开发的一个重要方面。硅橡胶补强领域的最新技术引起了人们对功能化橡胶越来越多的兴趣,因为它们可以直接反应并增强与二氧化硅填料的相互作用,从而改善橡胶补强性能。目前的工作旨在更好地了解不同反应变量(即时间、温度、橡胶浓度、溶剂、表面活性剂、超声处理、二氧化硅比表面积、橡胶类型和催化剂)对模型反应中橡胶在二氧化硅表面沉积的作用在二氧化硅和功能化橡胶的溶液中。实验设计 (DoE) 研究的结果,即一次单因子 (OFAT)、Plackett-Burman (P-B) 和全因子 (FF) 设计表明,所有研究的因素对界面的影响都可以忽略不计。橡胶与二氧化硅表面的偶联效率。橡胶分子上官能团的可及性和大聚合物分子链造成的空间位阻似乎是最大的限制因素,导致偶联效率低。阐明了所研究的反应参数的影响以及橡胶-二氧化硅偶联反应中涉及的合理机制。

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Interfacial coupling efficiency of functionalised rubbers on silica surfaces

Understanding filler-polymer interactions at the interfaces is an important aspect for rubber reinforcement development. Recent technology in the field of silica-rubber reinforcement has led to an increasing interest in functionalised rubbers, since they can directly react and enhance interactions with silica filler, and hence improved rubber reinforcement. The present work aims to better understand the role of different reaction variables, i.e. time, temperature, rubber concentration, solvent, surfactants, sonication, specific surface area of silica, rubber type, and catalyst, on rubber deposition on silica surface in a model reaction in solution of silica and functionalised rubbers. Results from the Design of Experiments (DoEs) study, i.e. One-Factor-At-a-Time (OFAT), Plackett-Burman (P-B) and Full-Factorial (FF) designs showed that all studied factors have a negligible effect on interfacial coupling efficiency of rubber to silica surface. Accessibility of the functional groups at the rubber molecules and the steric hindrance due to large polymeric molecular chains seem to be the most limiting factors, resulting in low coupling efficiency. Effects of the investigated reaction parameters and plausible mechanisms involved in rubber-silica coupling reactions are elucidated.



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