Exploring the effects of bound rubber phase on the physical properties of nano-silica composites with a vitrimer-like bond exchangeable matrix

编号 020037104

推送时间 20221128

研究领域 林产化工 

年份 2022 

类型 期刊 

语种 英语

标题 Exploring the effects of bound rubber phase on the physical properties of nano-silica composites with a vitrimer-like bond exchangeable matrix

来源期刊 Polymer Journal

期 第371期

发表时间 20220411

关键词 DYNAMIC COVALENT CHEMISTRY;  CROSS-LINK DENSITY;  MECHANICAL-PROPERTIES;  POLYMER NANOCOMPOSITES;  EPOXY POLYMERS;  REINFORCEMENT;  NETWORKS;  ELASTOMERS;  INTERFACE;  ROBUST; 

摘要 We demonstrate the preparation and unique properties of composite vitrimer-like materials containing silica nanoparticles (SNPs). The matrix is composed of polyacrylate-based polymers crosslinked via a pyridine-bromo quaternization reaction, where the quaternized pyridine at the crosslinking point exchanges the bond pair via trans-N-alkylation at high temperatures. Homogeneous composite samples without a large aggregation of SNPs were prepared within the silica volume fraction range (phi(P)) from 0.06 to 0.36. The formation of the bound rubber phase and the strong adhesion between the SNP and matrix are admitted in the data from structural, thermal, and mechanical investigations. The crosslinked composites exhibit great stress relaxation at high temperatures because of bond exchange, wherein unique bimodal relaxation behaviors are observed for the samples with high phi(P) because of the bound rubber phase. In the final section, some useful functions, such as reprocessability and recyclability, derived from the bond exchange nature are exhibited.

服务人员 尚玮姣

服务院士 宋湛谦

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