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采用原位乳液共聚合接枝方法改进玻璃纤维(GF)与苯乙烯-丙烯腈共聚物(SAN)之间的界面粘接性能。先用硅烷偶联剂预处理GF,以苯乙烯(St)、丙烯腈(AN)为单体,制备了不同GF/单体质量比的接枝SAN的玻璃纤维(GF-g-SAN),再与SAN树脂共混,制备了不同GF-g-SAN含量的GF-g-SAN/SAN复合材料。采用SEM研究了冲击断面的形态,测试了GF-g-SAN/SAN的冲击强度和动态力学性能,并采用COX模型进行力学模型分析。冲击性能测试、SEM形貌分析和DMA表征均说明改性后的玻纤同SAN之间具有良好的界面粘合力;GF/St质量比为1∶1时,短GF在低含量范围内、长玻纤在较高含量时能有效改善SAN的刚性和韧性;采用COX模型计算的结果与实验数据接近。
In-situ emulsion copolymerization grafting method was used to improve interfacial adhesion between glass fiber (GF) and styrene-acrylonitrile copolymer (SAN). GF was prepared by pretreatment of silane coupling agent (GF-g-SAN) with different GF / monomer weight ratio by using styrene (St) and acrylonitrile Then with the SAN resin blending, GF-g-SAN / SAN composites with different GF-g-SAN content were prepared. The morphology of impact section was studied by SEM, the impact strength and dynamic mechanical properties of GF-g-SAN / SAN were tested, and the mechanical model was analyzed by COX model. The impact properties, SEM morphology and DMA characterization all showed that the modified glass fiber had good interfacial adhesion with SAN. When the mass ratio of GF / St was 1: 1, the short GF was in the low content range, The long glass fiber can effectively improve the rigidity and toughness of SAN at higher content. The results calculated by COX model are close to the experimental data.