聚甲氧基有机硅/莫来石杂化材料的高温处理与热膨胀性能研究

北京化工大学学报(自然科学版) ›› 2011, Vol. 38 ›› Issue (1) : 44-48.

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北京化工大学学报(自然科学版) ›› 2011, Vol. 38 ›› Issue (1) : 44-48.
材料科学与工程

聚甲氧基有机硅/莫来石杂化材料的高温处理与热膨胀性能研究

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Preparation and performance of polymethoxylsiloxane/mullite thermal-resistant and low-expansion composite

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摘要

制备了耐高温低膨胀聚甲氧基有机硅(PMOS)/莫来石杂化材料。FT-IR 与 XRD 测试表明材料在热处理过程中 PMOS 基体逐渐降解,而莫来石晶体则随温度的升高而稍有生长;TG 测试表明材料在800 ℃高温处理后仍有 93.4% 的质量残留;SEM 显示莫来石均匀分散在 PMOS 基体中;材料的冲击强度随热处理温度的升高而先减小后增大,800 ℃热处理后材料的冲击强度为924 J/m2;材料的膨胀系数很低,且随莫来石含量的增加而减小;聚甲氧基有机硅/莫来石杂化材料具有良好的耐高温性能与低热膨胀性能。

Abstract

A polymethoxylsiloxane (PMOS)/mullite composite with good thermal resistance and low expansion has been prepared at room temperature. Fourier transform infrared spectroscopy and X-ray diffraction showed that on thermal treatment the PMOS underwent a gradual degradation, while the mullite crystals increased slightly in size with increasing temperature. Thermogravimetric analysis showed that the material after heat treatment at 800 ℃ retained 93.4% of its original mass; and scanning electron microscopy showed that the mullite was uniformly dispersed throughout the PMOS matrix. On heating, the impact strength initially decreased with increasing temperature up to 400 ℃ and then increased. After thermal treatment at 800 ℃, the impact strength of the material was 924 J/m2, and its expansion coefficient was very low, and decreased with increasing mullite content. The results show that polymethoxylsiloxane (PMOS)/mullite composites have good high temperature resistance and low thermal expansion properties.

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聚甲氧基有机硅/莫来石杂化材料的高温处理与热膨胀性能研究[J]. 北京化工大学学报(自然科学版), 2011, 38(1): 44-48
Preparation and performance of polymethoxylsiloxane/mullite thermal-resistant and low-expansion composite[J]. Journal of Beijing University of Chemical Technology, 2011, 38(1): 44-48

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