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采用环状对苯二甲酸丁二醇酯(CBT)原位聚合制备了连续玻璃纤维(GF)增强聚环状对苯二甲酸丁二醇酯(PCBT)复合材料。考察了聚合反应中催化剂用量对PCBT结晶度以及GF/PCBT复合材料力学性能的影响。当催化剂用量为0.5%(质量分数)时,PCBT的结晶度为53%,GF/PCBT的力学性能达到最佳,拉伸强度为522MPa,拉伸模量为27GPa,弯曲强度为481MPa,弯曲模量为24.8GPa,层间剪切强度(ILSS)为43MPa。SEM观察表明,发现催化剂用量为0.5%时,树脂与纤维的结合性较好。进一步研究了淬火和退火后处理对复合材料力学性能的影响。发现复合材料退火处理后具有较好的力学性能,其中拉伸强度为545MPa,弯曲强度为495MPa。
The continuous glass fiber (GF) reinforced polycyclic polybutylene terephthalate (PCBT) composites were prepared by in situ polymerization of cyclic butylene terephthalate (CBT). The effects of the amount of catalyst on the crystallinity of PCBT and the mechanical properties of GF / PCBT composites were investigated. When the amount of catalyst is 0.5% (mass fraction), the crystallinity of PCBT is 53%, the mechanical properties of GF / PCBT are best, the tensile strength is 522MPa, the tensile modulus is 27GPa, the flexural strength is 481MPa, The amount was 24.8 GPa and the interlaminar shear strength (ILSS) was 43 MPa. SEM observation showed that when the amount of catalyst was found to be 0.5%, the bond between resin and fiber was better. The effect of quenching and annealing treatment on the mechanical properties of the composites was further studied. It is found that the composite has better mechanical properties after annealing, in which the tensile strength is 545MPa and the flexural strength is 495MPa.