氯乙烯-N-苯基马来酰亚胺(-丙烯腈)悬浮共聚物的耐热性能  

HEAT RESISTANT PROPERTIES OF VINYL CHLORIDE-N-PHENYLMALEIMIDE (-ACRYLONITRILE) SUSPENSION POLYMERIZED COPOLYMER

作　　者：杜淼[1] 翁志学[1] 单国荣[1] 黄志明[1] 潘祖仁[1] 

机构地区：[1]浙江大学高分子工程研究所,杭州310027

出　　处：《高分子学报》2002年第1期78-82,共5页Acta Polymerica Sinica

基　　金：;国家教育部博士学科点专项基金资助课题 (批准号 95 335 0 4)

摘　　要：用玻璃化转变前后储能模量的变化、储能模量的变化速率以及内耗的大小等参数来考察氯乙烯(VC) N 苯基马来酰亚胺 (PMI)以及氯乙烯 N 苯基马来酰亚胺 丙烯腈 (AN)悬浮共聚物的耐热性能 ,辅以维卡软化点测定进行比较 .用动态力学分析方法的研究结果表明 ,共聚物发生玻璃化转变时 ,储能模量随温度的最大变化速率的绝对值越小 。Vinyl chloride/ N-phenylmaleimide copolymer ( VC/PMI) and vinyl chloride/ N-phenylmaleimide/ acrylonitrile terpolymer (VC/PMI/AN) were synthesized in the suspension copolymerization process for improving the heat resistance of poly( vinyl chloride) PVC) This paper emphasized on the studies on the characterization of the heat resistant properties of these three co) polymers mainly by means of dynamic mechanical experiment with the change of storage modulus ( E'), change rate of E' with temperature and mechanical loss factor ( tandelta) near the glass transition. The Vicat softening point ( VSP) was also tested supplementally for comparison. The lower the change rate of E' with temperature is, the higher the heat resistance of VC/PMI and VC/PMI/AN will be. The effects of the amount of PMI and AN in the recipes of copolymerization on the change rate of E' with temperature, tandelta and VSP were also investigated. The results show that the increase of the amount of PMI will increase the rigidity of the backbone of the copolymer chain so as to improve the heat resistance. On the other hand, the introduction of AN into the copolymer will give more uniform distribution of PMI unit or segment in the backbone, and thus improves the heat resistance of the copolymer further. It is discovered that there are two peaks of mechanical loss or two glass transition temperatures of VC/PMI/AN copolymerization product. It may be interpreted from the higher reactivities of PMI and AN than VC. During the copolymerization process of VC, PMI and AN, the more active PMI and AN will copolymerize more rapidly and will consume entirely at conversion of about 45% similar to 50%. Thereafter, VC continues to homopolymerize to form PVC homopolymer until a final conversion of 85%. Actually, the final product is a mixture of VC/PMI/AN terpolymer and homo-PVC, showing two T(g)s.

关 键 词：氯乙烯 N-苯基马来酰亚胺 丙烯腈 悬浮共聚物 耐热性能 聚氯乙烯 

分 类 号：TQ325[化学工程—合成树脂塑料工业]