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摘要
聚硅氧烷广泛用于耐热复合材料的制备,但其主链易弯曲降解,导致耐高温性能下降,可通过添加多面体低聚倍半硅氧烷(POSS)对聚硅氧烷进行同系增强。首先以乙烯基三甲氧基硅烷在酸性条件下水解缩合制备乙烯基POSS,再将其共混到端羟基聚二甲基苯基硅氧烷中,由于乙烯基POSS本身具有大体积空间位阻和良好的耐热性,因此制得的聚硅氧烷复合材料具有优异的耐热性。采用红外光谱、热重、扫描电镜等仪器对其进行表征,探究不同乙烯基POSS添加量对复合材料性能的影响,并对其耐热性能和机械性能进行测试。结果表明:当乙烯基POSS添加质量为3%时,复合材料具有良好的耐热性和机械性能,有效解决了聚硅氧烷基体易降解导致的耐高温性不足问题。
Abstract
Polysiloxane is widely used in the preparation of heat-resistant composites,but its main chain is prone to bending and degradation,resulting in a decrease in high-temperature resistance.This limitation can be addressed by reinforcing polysiloxane with polyhedral oligomeric silsesquioxane (POSS).In this paper,vinyl-POSS was first prepared by hydrolysis and condensation of vinyl triethoxysilane under acidic conditions,and then blended into hydroxyl-terminated polydimethylphenylsiloxane.Due to the large volume steric hindrance and good heat resistance of vinyl POSS,the obtained polysiloxane composites had excellent heat resistance.The composites were characterized by infrared spectroscopy,thermogravimetric analysis,scanning electron microscopy and other instruments.The effects of different vinyl POSS additions on the properties of the composites were investigated,and their heat resistance and mechanical properties were tested.The results showed that when the addition amount of vinyl POSS was 3%,the composite exhibited good heat resistance and mechanical properties,effectively solving the problem of insufficient high-temperature resistance caused by the easy degradation of polysiloxane matrix.
关键词
乙烯基低聚倍半硅氧烷
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聚硅氧烷
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复合材料
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耐热性
Key words
vinyl-POSS
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polysiloxane
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composite material
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heat resistance
POSS/聚硅氧烷复合材料的制备及性能研究[J].
化工新型材料, 2026, 54(6): 107-111 DOI:10.19817/j.cnki.issn1006-3536.2026.06.023
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基金资助
河北省自然科学基金面上项目(E2022110002);河北省教育厅高等学校科学技术研究项目(ZC2024129);沧州市自然科学基金面上项目(221001005D);沧州师范学院“先进复合材料与涂层科研创新团队”项目(cxtdl2302)
