CPE溶胀条件对ACS树脂结构与性能的影响

Effect of Swelling Condition of CPE Rubber on Structure and Properties of ACS Resin Through Bulk Polymerization

ACS树脂是将苯乙烯(St)和丙烯腈(AN)接到氯化聚乙烯(CPE)分子链上形成的一种接枝共聚物,采用本体法考察了CPE的溶胀条件对本体聚合合成ACS树脂的接枝率、冲击性能、相形态、游离苯乙烯丙烯腈共聚物(SAN)相对分子质量及其分布的影响。结果表明,CPE的溶胀温度和时间对接枝率、游离SAN树脂相对分子质量、冲击性能及相形态的影响较大,对游离SAN相对分子质量分布没影响;只有CPE被充分溶胀后,本体聚合成ACS树脂才能获得较高的接枝率、良好的相形态及冲击性能;100℃溶胀3h可使CPE最快充分溶胀,此条件下合成ACS树脂的接枝率最高(23.1%),冲击强度最大(57.4kJ/m2),分散相粒径最小且分散最好。

ACS resin is a type of grafting copolymer, in which styrene (St) and acrylonitrile (AN) as co-monomers were grafted onto the molecular chain of chlorinated polyethylene (CPE). The effect of swelling conditions of CPE rubber on the grafting rate, Izod impact strength and phase morphology of the ACS resin synthesized in this work through bulk polymerization were synthesized by bulk polymerization, and the molecular weight and molecular weight distribution of free SAN in the ACS resin were also investigated. The results indicated that the swelling temperature and time of CPE rubber significantly influenced the grafting rate, Izod impact strength and phase morphology of ACS resin and the molecular weight of free SAN in the ACS resin. However, there was no effect on the molecular weight distribution of free SAN. The optimum grafting rate, phase morphology, Izod impact strength of ACS resin and the optimum molecular weight of free SAN could be achieved for the synthesized resin only when CPE rubber swelled fully. The CPE rubber could swell quickly and fully at 100 ℃ within 3 h. The resin could gain an optimum grafting rate of 23.1 %, Izod impact strength and phase morphology under the above condition.