作　　者： ; ; ; ; ;

机构地区： 东北大学理学院

出　　处： 《复合材料学报》 2005年第3期30-34,共5页

摘　　要： 采用自制的丙烯酸丁酯接枝甲基丙烯酸甲酯核壳结构增韧剂(PBAgPMMA,AIM)与聚氯乙烯(PVC)树脂熔融共混,制备了AIM/PVC共混物。研究了增韧剂粒子在PVC中的分散和空洞化、AIM/PVC共混物的断裂与脆韧转变。结果表明,球形的增韧剂粒子能够在PVC树脂中均匀分散并对PVC有很好的增韧作用,在PVC树脂中加入质量分数为6.5%AIM时,冲击样条以韧性方式断裂;样条冲击断面周围应力发白区域内产生了空洞。提出AIM增韧PVC的机理是橡胶粒子的空洞化与塑料基体剪切屈服协同作用。 Core-shell structured acrylate impact modifier (AIM) particles of poly (butyl acrylate) grafted poly (methyl methacrylate) (PBA-g-PMMA) were synthesized, which were used to prepare AIM/PVC blends by melting process. AIM particles distribution and its cavitations in PVC resin, the fracture and brittle-ductile transition of AIM/PVC blends were investigated. The results show that spherical AIM particles well disperse in the PVC matrix and toughen the PVC resin effectively. The impact test samples with 6.5% (mass fraction) AIM modifiers broke in ductile failure. It was found that cavitations are formed in the stress-whitened area near the fracture surface. The toughening mechanism of PVC is synergistic toughening by cavitations of the rubber particles and shear yielding of the matrix.

关 键 词： 核壳粒子 丙烯酸酯抗冲击改性剂 脆韧转变 空洞化

领　　域： [一般工业技术] [化学工程]