论文部分内容阅读
采用原位聚合法,以3,3′,4,4′-二苯醚四甲酸二酐(ODPA)和4,4′-二氨基二苯醚(ODA)为反应单体,N,N-二甲基甲酰胺(DMF)为溶剂进行缩聚反应,制备聚酰胺酸(PAA),将经硅烷偶联剂KH-550改性后的水滑石加入到PAA中,最终预聚物经热亚胺化后制得水滑石/聚酰亚胺复合材料。利用傅里叶红外光谱测试仪、X-射线衍射仪、扫描电镜,研究改性水滑石及复合材料的结构、组成及形貌。通过紫外分光光度计、热失重分析以及拉伸实验测试分析复合材料的相关性能。结果发现:加入水滑石后,复合材料热稳定性良好,透光性及力学性能得到改善,拉伸强度最大提高了约64%。
In situ polymerization was used as the reaction monomer, 3,3 ’, 4,4’-diphenyl ether tetracarboxylic dianhydride (ODPA) and 4,4’-oxydianiline (ODA) Polyamidic acid (PAA) was prepared by polycondensation reaction with dimethylformamide (DMF) as solvent, hydrotalcite modified by silane coupling agent KH-550 was added to PAA, and the final prepolymer was heated with thermal imine After the preparation of hydrotalcite / polyimide composite. The structure, composition and morphology of modified hydrotalcite and its composites were studied by Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy. The properties of the composites were analyzed by ultraviolet spectrophotometer, thermogravimetric analysis and tensile test. The results showed that the hydrothermal stability of the composites was improved, the transparency and mechanical properties were improved, and the tensile strength was increased by about 64% at the maximum.