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蒙脱土/二氧化钛/聚酰亚胺纳米杂化薄膜低温力学及热稳定性能研究

, PP. 69-74

Keywords: 聚酰亚胺,二氧化钛,蒙脱土,溶胶-凝胶法,插层法,力学性能,热稳定性

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Abstract:

利用插层法和溶胶-凝胶法制备了不同含量的蒙脱土/二氧化钛/聚酰亚胺(MMT/TiO2/PI)纳米杂化薄膜。采用傅立叶红外光谱、紫外可见光谱、扫描电镜和热重分析等对该体系的分子结构、断口形貌和热性能进行了表征,同时研究了聚酰亚胺杂化薄膜低温(77K)力学性能。结果表明,纳米粒子与基体结合情况良好,热分解温度Td有所上升。TiO2/PI杂化薄膜低温拉伸强度随TiO2质量分数增加而有所下降;而MMT/TiO2/PI杂化薄膜拉伸强度随TiO2质量分数增加而增加并在TiO2质量分数为2%时达到最大值,说明TiO2与MMT超混杂产生了协同效应。另外,弹性模量随无机颗粒含量的增加而提高,但断裂伸长率则下降。

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