Preparation and properties of continuous glass fiber reinforced anionic polyamide-6 composites via in situ anionic ring-opening polymerization
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摘要: 采用原位阴离子开环聚合法制备了连续玻璃纤维(GF)增强阴离子聚酰胺-6(APA6)复合材料,考察了催化剂配比和聚合温度对APA6树脂转化率和分子量的影响,采用DSC和TGA研究了聚合温度和时间对连续GF/APA6复合材料结晶度的影响,进一步探讨了聚合温度和时间对连续GF/APA6 复合材料力学性能的影响,采用SEM观察了复合材料的拉伸断裂形貌。结果表明: 当聚合温度为150 ℃,聚合时间为45 min时,连续GF/APA6 复合材料的力学性能达到最高,材料的拉伸强度为538.1 MPa,弯曲强度为497.2 MPa,层间剪切强度为52.5 MPa;SEM分析表明,APA6树脂基体与玻璃纤维具有较好的结合性。Abstract: Continuous glass fiber (GF) reinforced anionic polyamide-6 (APA6) composites were prepared via in situ anionic ring-opening polymerization.The effects of catalyst ratio and polymerization temperature on the conversion and molecular weight of APA6 resin were studied.The effects of polymerization temperature and time on the degree of crystallinity of continuous GF/APA6 composites were investigated using DSC and TGA, and the effects of polymerization temperature and time on mechanical properties of continuous GF/APA6 composites were further discussed.The morphologies of tensile fracture surfaces of continuous GF/APA6 composites were observed by SEM.Results show that, when the polymerization temperature is 150 ℃ and the polymerization time is 45 min, the continuous GF/APA6 composites reach the highest values of mechanical properties, which the tensile strength is 538.1 MPa, bending strength is 497.2 MPa and interlaminar shear strength is 52.5 MPa.The SEM analysis shows that there is a good bonding quality between the glass fiber and APA6 resin matrix.
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