Preparation and properties of continuous fiber reinforced PCBT composites by in-situ polymerization
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摘要: 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522 MPa, 拉伸模量为27 GPa, 弯曲强度为481 MPa, 弯曲模量为24.8 GPa, 层间剪切强度(ILSS)为43 MPa。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545 MPa, 弯曲强度为495 MPa。Abstract: Continuous glass fiber (GF) reinforced poly(cyclic butylene terephthalate) (PCBT) composites were prepared via in-situ polymerization of cyclic butylene terephthalate (CBT). The effects of the catalyst contents on the crystallinity and the mechanical properties of GF/PCBT composites were studied. When the catalyst mass fraction reaches 0.5%, the crystallinity is 53% and the GF/PCBT composites show the highest values of mechanical properties, tensile strength 522 MPa, tensile modulus 27 GPa, flexural strength 481 MPa, flexural modulus 24.8 GPa and interlaminar shear strength (ILSS) 43 MPa. The SEM results show good bonding quality between the fiber and the matrix at 0.5% of catalyst. The effects of quenching and annealing treatments on the mechanical properties of GF/PCBT composites were further investigated. The results show that the improved mechanical properties after annealing treatment, tensile strength is 545 MPa and flexural strength is 495 MPa.
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