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以水热法合成的BaTiO3纤维和同步法制备的互穿聚合物网络为原料,采用原位分散聚合法获得了一系列BaTiO3/(PU/UP-IPNs)复合材料。采用傅立叶交换红外分光光度计跟踪考察了IPNs的聚合过程,用透射电镜观测了IPNs及其复合物的形貌。结果表明,IPNs中两相相畴尺寸在纳米级范围内,在此基础上,实现了BaTiO3纤维状的复合。动态力学性能的检测结果表明,相较纯IPNs,复合材料的阻尼损耗模量和阻尼损耗因子值均有所提高,且在低温区均出现了肩峰。复合物的最大损耗因子值均大于0.4,在约50℃范围内,E″值提高100MPa。力学性能检测结果表明,IPNs中的连续相是决定材料力学性能的主要因素;有机/无机组分间混溶性的降低,使BaTiO3/IPNs复合材料的抗张强度和断裂伸长率均下降。
A series of BaTiO3 / (PU / UP-IPNs) composites were prepared by in-situ dispersion polymerization using BaTiO3 fiber synthesized by hydrothermal method and interpenetrating polymer network prepared by synchronous method. The polymerization process of IPNs was investigated by Fourier transform infrared spectrophotometer. The morphologies of IPNs and their complexes were observed by TEM. The results show that the size of two phase domains in IPNs is in the nanoscale range, and on this basis, BaTiO3 fibrous composite is realized. The testing results of dynamic mechanical properties show that the damping loss modulus and the damping loss factor of the composites increase compared with the pure IPNs, and the shoulder peak appears in the low temperature region. The maximum loss factor values of the composites were all above 0.4, and the E "value increased by 100 MPa at about 50 ℃. The mechanical properties of the composites showed that the continuous phase in IPNs was the main factor that determines the mechanical properties of the composites. The decrease of miscibility leads to the decrease of tensile strength and elongation at break of BaTiO3 / IPNs composites.