摘要
采用种子乳液聚合方法,在交联的丁苯(SBR)乳胶粒子上接枝甲基丙烯酸甲酯(MMA)和苯乙烯(St),制得MBS核-壳接枝共聚物,并将其作为增韧剂与聚氯乙烯(PVC)共混制备MBS/PVC共混物。分析了MBS的结构特征,考察了不同核壳比的MBS在PVC中的分散状态以及对MBS/PVC共混物力学性能和透光性能的影响,以制备高透光高韧性的MBS/PVC共混物。实验结果表明:当MBS壳层中PMMA量少时,MBS粒子在PVC基体中不能实现良好分散,MBS粒子呈聚集状态;随着MBS壳层中PMMA含量增加,MBS粒子由团聚状态转变成网络状,当MBS壳层量增加到一定量时,MBS粒子以单一粒子状态实现均匀分散。随着MBS壳层量增加,使PVC/MBS共混物实现脆韧转变所需的SBR橡胶的质量分数降低,共混物的透光率降低;小粒径MBS增韧PVC的主要机制是基体的剪切屈服。
Methyl methacrylate-butadiene-styrene（MBS） core-shell copolymer was synthesized by grafting methyl methacrylate and styrene on SBR rubber particles using the seed emulsion polymerization.MBS/PVC blends were obtained by melt blending.The structure characteristics of MBS were analyzed,and the effects of different core/shell ratios in MBS on the disperse morphology,mechanical property and transparency property of MBS/PVC blends were investigated for obtaining high ductility and transparency MBS/PVC blends.With increasing the shell amount of MBS,dispersion states showed aggregation,network dispersion and homogeneous dispersion,the SBR brittle-ductile transition content for MBS/PVC blends decreases and the transparency of MBS/PVC blends decreases.The toughening mechanism of PVC blends with small MBS particles is shear yielding of the PVC matrix.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2010年第1期32-36,共5页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(50803007)
关键词
核壳改性剂
结构特征
聚氯乙烯
增韧机制
脆韧转变
core-shell modifier
structure characteristics
poly（vinyl chloride）
toughening mechanism
brittle-ductile transition
