PVC/木粉复合材料抗冲改性研究

Research on the impact modification of PVC/wood flour composites

用甲基丙烯酸、丙烯酸丁酯、甲基丙烯酸甲酯三元共聚物P(MAA-BA-MMA)对木粉进行预处理,再利用CPE、ACR和nano-CaCO_3对PVC/木粉复合材料进行增韧改性。结果表明,木粉经P(MAA-BA-MMA)预处理后,使用ACR增韧时效果最好,其拉伸强度、弯曲强度、冲击强度和断裂伸长率分别提高了7.97%、5.26%、68.85%和571.26%。SEM结果表明,木粉预处理后再增韧,复合材料界面模糊,断面呈一定的韧性断裂特征。

Wood flour was pretreated with terpolymer of methacrylic acid, butyl acrylate and methyl methacrylate [P（MAA-BA- MMA）], and then the PVC/wood flour composite materials were toughness modified by CPE,ACR and nano- CaCO3. The results showed that the effects were the best when wood flour was pretreated by P（MAA- BA- MMA） and then the composites were toughened by ACR, and the tensile strength, flexural strength, impact strength and elongation at break of PVC/wood flour composites were increased by 7.97% ,5.26% ,68.85% and 571.26%, resp. The SEM results showed that the interface of composites was blurry and the fracture surfaces exhibited toughness characteristics when the wood flour was pretreated by P（MAA- BA- MMA） and then the composites were toughened by impact modifier.