含稀土的N-环己基马来酰亚胺耐热改性剂的合成及其与聚氯乙烯共混的研究

Synthesis of N-cyclohexyimaleimide Heat Resistant Modifier Containing Rare Earth and Its Blend with Poly(vinyl chloride)

用乳液聚合的方法制备了马来酸单十二酯谰-N-环己基马来酰亚胺-苯乙烯-甲基丙烯酸甲酯四元共聚物,将其作为耐热改性剂与聚氯乙烯(PVC)共混。研究了马来酸单十二酯镧的用量对共聚物组成、玻璃化转变温度及共混物热性能和力学性能的影响。结果表明,当马来酸单十二酯镧的用量为5%(质量分数,下同)、N-环己基马来酰亚胺用量为9.5%时.且此共聚物的用量为 PVC 的20%时,所得共混改性 PVC 的维卡软化点比纯 PVC 提高了4.7℃,失重1%时的热分解温度比纯 PVC 提高了32.64℃,热分解50%时的温度与纯 PVC 相比提高约17 31℃,冲击强度、拉伸强度与纯 PVC 相比分别提高了1.62%和3.35%。

Quadripolymer of tris （monododecy ester maleate） lanthanum, N-cyclohexyl-maleimide, styrene, and methyl methacrylate was synthesized via emulsion copolymerization and employed in PVC to improve its heat resistance. When the amount of LaTM and N-cyclohexylmaleimide in copolymer was 5 and 9.5 wt%, respectively, and the loading of quadripolymer in PVC was 20 wt%, the Vicar soften- ing temperature, the 1% and 50 % weight loss temperature of the blends increased 4.7℃ , 32.64℃, and 17.31 ℃ based on neat PVC, respectively. In addition, the tensile and impact strengths of the blends increased 3.35 % and 1.62 %, respectively.