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Polyimide nanocomposites with functionalized SiO2 nanoparticles: enhanced processability, thermal and mechanical properties

机译：具有功能化SiO2纳米粒子的聚酰亚胺纳米复合材料：增强的可加工性，热和机械性能

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摘要

SiO2-polyimide nanocomposites were successfully fabricated by surface modification of silica nanoparticles. In order to create structural similarity between the polymer and the SiO2 surface and to generate interfacial interaction with the polymer chain, (3-trimethoxysilylpropyl)diethylenetriamine was attached to the surface, and then, the surface amines were reacted with phthalic anhydride. The modified silica nanoparticles in polyamic acid solution were subjected to thermal imidization to obtain SiO2-polyimide (PI) nanocomposite films. Cross-sectional transmission electron microscopy results showed no significant aggregation in any of the SiO2-PI nanocomposite films having up to 20 wt% of silica nanoparticles. The effects of silica nanoparticles as a filler material on the thermal, optical, and mechanical properties of the SiO2-PI nanocomposite films were studied in comparison with those of PI by UV-vis spectrometry, thermal gravimetric analysis, thermal mechanical analysis, and nanoindentation.
机译：SiO2-聚酰亚胺纳米复合材料是通过对二氧化硅纳米粒子进行表面改性而成功制备的。为了在聚合物和SiO 2表面之间产生结构相似性并产生与聚合物链的界面相互作用，将（3-三甲氧基甲硅烷基丙基）二亚乙基三胺附着到该表面，然后使表面胺与邻苯二甲酸酐反应。对聚酰胺酸溶液中的改性二氧化硅纳米粒子进行热酰亚胺化处理，得到SiO2-聚酰亚胺（PI）纳米复合薄膜。横截面透射电子显微镜结果显示，在具有至多20 wt％的二氧化硅纳米颗粒的SiO2-PI纳米复合膜中，没有明显的聚集。通过紫外-可见光谱，热重量分析，热力学分析和纳米压痕，研究了二氧化硅纳米粒子作为填料对SiO2-PI纳米复合薄膜的热，光学和机械性能的影响，并与PI进行了比较。

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