甲基丙烯酸缩水甘油酯熔融接枝K树脂

摘要

The copolymer of glycidyl methacrylate(GMA) grafting styrene and butadiene block copolymer (referred to as K resin)(K-g-GMA) was prepared by melting extrusion with a co-rotating twin-screw extruder. The character and grafting ratio of K-g-GMA were studied by Fourier transform infrared spectroscopy (FTIR) and acid-base titration. The effects of GMA content on the grafting ratio and the melt flow rate of K-g-GMA were studied. The grafted copolymer was added to the blending system of K resin and styrene-acrylonitrile copolymer (SAN),and the K/SAN transparent alloy was prepared by melt blending process. The results show that the grafting ratio of K-g-GMA is increased with the increase of GMA content. The grafted copolymer has the highest grafting ratio and therefore good fluidity of its melt when the content of GMA is 4 phr. When the mass ratio of K resin to SAN is 15∶85 and mass percentage of K-g-GMA is 3%,the tensile strength,Izod notched impact strength and transmittance of the transparent alloy are increased by 6.08%,25.72%,0.92%,respectively in comparison with those of the alloy without K-g-GMA.%采用同向双螺杆挤出机熔融挤出制备甲基丙烯酸缩水甘油酯（GMA）接枝苯乙烯-丁二烯嵌段共聚物（简称K树脂）（K-g-GMA），用傅里叶变换红外光谱和酸碱滴定法对K-g-GMA进行表征并测定其接枝率，分析了GMA用量对K-g-GMA接枝率及熔体流动速率的影响。将K-g-GMA添加到K树脂与苯乙烯-丙烯腈共聚物（SAN）共混体系中，采用熔融共混法制备了K/SAN透明合金。结果表明：随着GMA用量的增加，K-g-GMA的接枝率逐渐升高，当GMA用量为4phr时，接枝率最高，熔体流动性较好。当K树脂与SAN质量比为15∶85，w（K-g-GMA）为3%时，与未加K-g-GMA相比，透明合金的拉伸强度、悬臂梁无缺口冲击强度和透光率分别提高6.08%，25.72%，0.92%。