原位聚合制备玻璃纤维/PCBT复合材料及其性能研究

Study on the preparation and properties of glass fiber/PCBT composites by in-situ polymerization

采用环状对苯二甲酸丁二醇酯(CBT)原位聚合制备了玻璃纤维(GF)增强聚环状对苯二甲酸丁二醇酯(PCBT)复合材料。研究了聚合温度及催化剂用量对PCBT粘均分子量、结晶度以及GF/PCBT复合材料力学性能的影响。结果表明,随着聚合温度的升高,PCBT的粘均分子量及结晶度逐渐增大并趋于稳定,GF/PCBT复合材料力学性能也不断增大;当聚合温度为210℃时,PCBT的粘均分子量为7.16×104 g/mol,结晶度为43.9%,GF/PCBT复合材料的拉伸和弯曲强度分别为(271.44±3.40)和(257.70±3.73)MPa。随着催化剂用量的增大,PCBT的粘均分子量和结晶度逐渐增大并趋于稳定,复合材料力学性能不断增强;当催化剂用量为0.4%(质量分数)时,PCBT的粘均分子量为7.13×104 g/mol,结晶度为44.4%,GF/PCBT复合材料的拉伸和弯曲强度分别为(265.10±3.31)和(260.30±2.03)MPa。

Glass fiber(GF)reinforced poly(cyclic butylene terephthalate)(PCBT)composites were prepared by in-situ polymerization of cyclic butylene terephthalate(CBT).The effects of the polymerization temperature and the catalyst content on the viscosity average molecular weight,the crystallinity of PCBT and the mechanical properties of GF/PCBT composites were investigated.The experimental results indicated that the viscosity-av-erage molecular weight and the crystallinity of PCBT were gradually increased and finally tended to stabilization with increasing of polymerization temperature.The mechanical properties of the GF/PCBT composites were constantly strengthened with increasing of polymerization temperature.When the polymerization temperature was 210 ℃,the viscosity-average molecular weight of PCBT was 7.16×104 g/mol,and its crystallinity reached 43.9%,the tensile strength and flexural strength of the GF/PCBT composites was (271.44 ± 3.40)and (257.70±3.73)MPa,respectively.With increasing of catalyst mass fraction,the viscosity-average molecular weight and the crystallinity of PCBT were gradually increased and finally tended to stabilization.The mechani-cal properties of the GF/PCBT composites were constantly strengthened with increasing of catalyst mass frac-tion.When the catalyst mass fraction reached 0.4wt%,the viscosity-average molecular weight of PCBT was 7.13×104 g/mol,and its crystallinity reached 44.4%,the tensile strength and flexural strength of the GF/PCBT composites was (265.10±3.31)and (260.30±2.03)MPa,respectively.