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PI/TiO_2纳米复合材料的耐溶剂和耐热性能研究
引用本文:杜宏伟,孔瑛.PI/TiO_2纳米复合材料的耐溶剂和耐热性能研究[J].高分子学报,2003(2):288-292.
作者姓名:杜宏伟  孔瑛
作者单位:石油大学化学化工学院,东营,257061
基金项目:国家重点基础研究发展计划(973计划),山东省自然科学基金,中国石油天然气集团公司资助项目,G2000026407,097B02122,,,,
摘    要:以可溶性聚酰亚胺PI(HQDPA DMMDA)和钛酸丁酯为原料 ,在共溶剂NMP中 ,通过溶胶 凝胶法制备出不同TiO2 含量的PI TiO2 复合膜 .采用TEM、TG DTG、DSC和溶剂抽提实验等手段表征了PI TiO2 复合膜的微结构和复合材料的耐溶剂性和耐热性等性能 .结果表明 ,TiO2 含量为 2 2 3wt%时 ,复合膜中TiO2 颗粒的平均尺寸为 1 0nm左右 .与纯PI膜相比 ,随着TiO2 含量的增加 ,PI TiO2 复合膜的耐溶剂性能显著增强 ,热稳定性明显提高 .复合材料的力学性能有所下降 .复合膜耐溶剂性和耐热性能的提高表明PI分子链与TiO2 无机网络间存在化学键联

关 键 词:聚酰亚胺TiO2  溶胶凝胶  纳米复合材料  耐溶剂性能  耐热性能
修稿时间:2002年8月8日

STUDY ON SOLVENT RESISTANCE AND THERMAL RESISTANCE OF POLYIMIDE/TITANIA NANOCOMPOSITES
DU Hongwei,KONG Ying.STUDY ON SOLVENT RESISTANCE AND THERMAL RESISTANCE OF POLYIMIDE/TITANIA NANOCOMPOSITES[J].Acta Polymerica Sinica,2003(2):288-292.
Authors:DU Hongwei  KONG Ying
Abstract:A series of polyimide/titania(PI/TiO 2) nanocomposite membranes with different contents of TiO 2 were fabricated by sol gel process based on an organic soluble PI and the tetrabutyl titanate in the common solvent NMP.TEM was employed to observe the microstructure of the composite membrane.The solvent resistance was measured through extraction experiment in polar solvents such as NMP,DMF and THF et al ,at 25℃ for 72 h.The thermal properties were investigated by DT DTG and DSC.The result showed that the average size of TiO 2 particles was about 10?nm in the composite membrane,which contained TiO 2 22.3% by weight.The solvent resistance and the thermal properties of the composites were greatly enhanced as compared with the pure PI.The residues of the extraction of the composites in NMP increased with the contents of TiO 2,and so did the thermal decomposition temperatures and the glass transition temperatures.All of these changes showed that the molecular chains of PI were chemically attached to the three\|dimension framework of TiO\-2 nano\|particles in the composites.An assumption was promoted to explain the relationship between the properties and the structures of PI/TiO 2 nano composites.
Keywords:Polyimide/TiO  2  Sol  gel  Nanocomposite  Solvent resistance  Thermal properties
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