PI/T-SiO_2杂化薄膜的制备及偶联剂的影响

Influence of coupling agents on the properties of PI/T-SiO_2 hybrid film

利用模板法制备了纳米管状SiO2(T-SiO2),在此基础上合成了聚酰亚胺/T-SiO2杂化薄膜.采用透射电子显微镜和扫描电子显微镜对T-SiO2的形态进行了研究,用红外光谱分析了硅烷偶联剂对杂化薄膜微观结构的影响,并讨论了偶联剂加入方式、用量等因素对杂化薄膜力学性能的影响.结果表明,所制备的SiO2主要为管口直径分布在100～500nm,长径比在10～500的T-SiO2;在聚酰胺酸形成后,加人经偶联剂改性的T-SiO2,且偶联剂用量为填料质量的10%时,杂化薄膜的拉伸强度和弹性模量取得最佳值,分别为111.8 MPa和1.42 GPa.

This paper successfully prepared a kind of silica in the form of nano-tube (T- SiO2) by template method, from which polyimide/T-SiO2 hybrids (PI/T-SiO2) was further synthesized for producing PI/T-SiO2 film. The morphology of the silica nano -tubes was characterized by transmission electron microscopy and scanning electron microscopy. The effect of silane coupling agent on microstructure of the PI/T-SiO2 film was analyzed with Fourier transform infrared spectrometry and other means. The dependence of mechanical properties of the PI/T-SiO2 film on the addition mode and dosage of the coupling agent was also studied. The results show that the silica so prepared takes the shape of rectangle tube with calibres ranging from 100 to 500 nm and the ratio of length to width from 10 to 500. The tensile strength and elastic modulus of the PI/T-SiO2 film reaches its optimum value of 111.8 MPa and 1.42 GPa respectively when the T-SiO2 modified with the coupling agent is added after the formation of polyamic acid and the coupling agent accounts for 10% of the filler's total mass.