原位乳液聚合改性玻璃纤维增强SAN
详细信息Improving the strength of SAN with modified glass fiber via in-situ emulsion copolymerization
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摘要: 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。Abstract: To improve the interface adhesion between glass fiber (GF) and styrene acrylonit rile copolymer (SAN)，GF was treated firstly with silane coupling agent，then the surface modified with styrene (St) and acrylonitrile (AN) via in-situ emulsion polymerization. Three types of GF-g-SANs with different GF/St mass ratios were copolymerized and then filled in the melting SAN resin to prepare GF/SAN composites. The impact strength，morphology and dynamic mechanical property of the composites were characterized by impact test instrument，SEM and DMA，respectively. The Young‘s modulus of GF/SAN composite was calculated by the COX model. The results show that there is high interface adhesion between GF-g-SAN and SAN. The tough and rigid properties of the composites can be increased effectively with low content of short GF-g-SAN and high content of long GF-g-SAN，and the result predicted via the COX model is close to the experimental data.
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