相容剂对长玻纤增强热塑性聚氨酯弹性体/聚乳酸复合材料性能的影响

采用熔体浸渍工艺制备长玻纤增强热塑性聚氨酯弹性体(TPU)/聚乳酸(PLA)复合材料;以苯乙烯-丙烯腈接枝甲基丙烯酸缩水甘油酯(SAG)作为相容剂,热塑性弹性体聚氨酯作为增韧剂,聚乳酸为基体树脂,考察苯乙烯-丙烯腈接枝甲基丙烯酸缩水甘油酯用量对长玻璃纤维增强聚TPU/PLA复合材料性能的影响。结果表明,加入苯乙烯-丙烯腈接枝甲基丙烯酸缩水甘油酯能改善长玻璃纤维增强聚TPU/PLA复合材料的相容性;长玻璃纤维增强聚TPU/PLA复合材料的拉伸强度、缺口冲击强度、弯曲强度和模量等力学性能及储能模量随着苯乙烯-丙烯腈接枝甲基丙烯酸缩水甘油酯用量的增加呈先增加后降低的趋势,而长玻璃纤维增强聚TPU/PLA复合材料的损耗因子则随苯乙烯-丙烯腈接枝甲基丙烯酸缩水甘油酯含量的增加呈现降低后增加的趋势;通过复合材料的形态分析表明,加入相容剂的复合材料中玻璃纤维与基体树脂界面强度增加,且玻璃纤维表面有一层包覆的树脂基体;通过分析得出,当相容剂添加量为6%时,长玻璃纤维增强聚TPU/PLA复合材料的拉伸强度、弯曲强度和模量、缺口冲击强度等力学性能最优。

Effect of Compatibilizer on Performance of Long Glass Fibers Reinforced Thermoplastic Polyurethane Elastomer and Polylactic Acid Composites

Using the melt impregnation device developed at our laboratory,long glass fibers reinforced thermoplastic polyurethane elastomer (TPU) and polylactic acid (PLA) composites were produced,using styrene-acrylonitrile grafted methyl acrylic glycidyl ester (SAG) as compatibilizer,thermoplastic polyurethane elastomer as toughening agent and polylactic acid (PLA) as matrix resin,And effects of compatibilizer content on performance of long glass fibers reinforced TPU/PLA composites were studied.The results demonstrate that the addition of styrene-acrylonitrile grafted methyl acrylic glycidyl ester (SAG) improves the compatibility of long glass fibers reinforced TPU/PLA composites.The tensile strength,notch impact strength,bending strength and modulus,and storage modulus of long glass fibers reinforced polystyrene composites firstly increase and then decrease with increasing styrene-acrylonitrile grafted methyl acrylic glycidyl ester content;The tanδ of long glass fibers reinforced polystyrene composites firstly decrease and then increase with increasing the styrene-acrylonitrile grafted methyl acrylic glycidyl ester content;SEM morphology analysis of composites shows that the addition of styrene-acrylonitrile grafting methyl acrylic glycidyl ester compatilizer increases the interface strength between glass fiber and matrix resin of composite materials,and glass fibers are coated with the matrix resins.When the SAG content is 6％,the tensile strength,bending strength and modulus,notched impact strength of long glass fiber reinforced TPU/PLA composites are optimal.