Improvement the flame retardancy, thermal conductivity and mechanical properties of silicone rubber via silane coupling agent modified CNTs-β-FeOOH,Journal of Applied Polymer Science

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Improvement the flame retardancy, thermal conductivity and mechanical properties of silicone rubber via silane coupling agent modified CNTs-β-FeOOH
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2023-01-20 , DOI: 10.1002/app.53656
Wenzong Xu ₁ , Yi Zhang ₁ , Liangjie Fan ₁ , Zhongqiong Qin ₁ , Zhihui Zhang ₁ , Ziwei Bian ₁

Affiliation

Silicone rubber with its odorless and non-toxic, high and low temperature resistance and other advantages is widely used in many fields, but its shortcomings of flammability and low thermal conductivity limit its application and development. Therefore, the research on flame retardant and thermal conductive silicone rubber is practically valueable. In this study, iron oxyhydroxide (β-FeOOH) was synthesized on carbon nanotubes (CNTs) by in situ growth and added to silicone rubber after surface modification with γ-aminopropyltriethoxysilane (KH550). The results showed that the limiting oxygen index (LOI) of methyl vinyl silicone rubber (VMQ) with the addition of one part of KH550@CNTs-β-FeOOH increased to 29.8%, its peak heat release rate (pHRR) and total heat release (THR) decreased by 40.1% and 30.2%, respectively, and its thermal conductivity increased to 0.3680 W/m·k. The flame-retardant performance and thermal conductivity of the VMQ composite were significantly improved. The improvement of its flame retardancy was mainly due to the catalytic carbonization of CNTs and β-FeOOH, which promoted the formation of dense carbon layers. The carbon layer insulates the exchange of oxygen and combustible gases. In addition, the thermal conductive network constructed by KH550@CNTs-β-FeOOH in the composite effectively improved the thermal conductivity of VMQ.

中文翻译：

硅烷偶联剂改性CNTs-β-FeOOH提高硅橡胶的阻燃性、导热性和力学性能

硅橡胶以其无味无毒、耐高低温等优点被广泛应用于许多领域，但易燃、导热系数低等缺点限制了其应用和发展。因此，阻燃导热硅橡胶的研究具有实用价值。在这项研究中，羟基氧化铁 (β-FeOOH) 通过原位生长在碳纳米管 (CNT) 上合成，并在用 γ-氨基丙基三乙氧基硅烷 (KH550) 进行表面改性后添加到硅橡胶中。结果表明，添加一份KH550@CNTs-β-FeOOH后，甲基乙烯基硅橡胶（VMQ）的极限氧指数（LOI）提高至29.8%，其峰值放热率（pHRR）和总放热量(THR) 分别下降了 40.1% 和 30.2%，导热系数提高到0.3680 W/m·k。VMQ复合材料的阻燃性能和导热性能得到显着提高。其阻燃性的提高主要是由于CNTs和β-FeOOH的催化碳化作用，促进了致密碳层的形成。碳层隔离氧气和可燃气体的交换。此外，复合材料中由KH550@CNTs-β-FeOOH构建的导热网络有效提高了VMQ的导热性能。碳层隔离氧气和可燃气体的交换。此外，复合材料中由KH550@CNTs-β-FeOOH构建的导热网络有效提高了VMQ的导热性能。碳层隔离氧气和可燃气体的交换。此外，复合材料中由KH550@CNTs-β-FeOOH构建的导热网络有效提高了VMQ的导热性能。

更新日期：2023-01-20

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