以六官能化硅氧烷(HFSi)作为脱醇型交联剂,探究其在单组分室温硫化硅橡胶(RTV-1)中的应用。结果表明:相较于广泛使用的甲基三甲氧基硅烷(MTMS),采用HFSi作为交联剂的RTV-1硅橡胶在硫化速率和力学性能方面表现更优;通过筛选复配交联剂配比,当HFSi/MTMS为1∶4(质量比)时,硅橡胶综合性能最优。此外,采用密度泛函理论(DFT)计算阐明了HFSi的交联反应机理,并解释了其与甲基三甲氧基硅烷的活性差异。
This study investigated the application of hexafunctional siloxane (HFSi) as alcohol-releasing crosslinker in one-component room-temperature-vulcanized silicone rubber (RTV-1).The results indicated that compared with the widely used methyltrimethoxysilane (MTMS),RTV-1 with HFSi as the crosslinker exhibited superior curing rate and mechanical properties.Through screening the blending ratio of crosslinkers,the optimal comprehensive performance of silicone rubber was achieved at a HFSi/MTMS ratio of 1∶4.Furthermore,density functional theory (DFT) calculations elucidated the crosslinking mechanism of HFSi and revealed HFSi's enhanced reactivity over MTMS.
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