摘要
在过氧化物引发剂作用下 ,用角鲨烷模拟乙丙共聚物与马来酸酐进行接枝反应 .产物的质谱图显示产物中兼有马来酸酐自聚物和接枝产物 ,证明体系中存在着马来酸酐自聚和马来酸酐在角鲨烷上接枝一对竞争反应 ,马来酸酐在本实验条件下并不存在一个自聚上限温度 .核磁共振碳谱显示马来酸酐很大一部分是以单个分子接枝在角鲨烷上 ,并且没有固定的接枝点 ,可以接在次甲基上 ,也可以接在亚甲基上 ,但接在次甲基上的概率要大于接在亚甲基上 .
Squalane has been used as a simulated substrate to investigate the reaction mechanism of maleic anhydride in grafting onto ethylene propylene copolymer in the presence of a peroxide initiator. Mass spectrometric analysis shows the products contain both poly(maleic anhydride) and squalane grafted maleic anhydride. This result indicates that instead of 150 ℃, the ceiling polymerization temperature of maleic anhydride as suggested by Gaylo rd , maleic anhydride can form short chain homopolymer even at 170 ℃, the reaction tempe rature used in this paper, in case of V (sq)∶ W (MA)∶ W (init)=100∶2∶0 2. 13 C NMR study shows that maleic anhydride can be grafted onto both methine carbons and methylene carbons of squalane, but the amount of maleic anhydride grafted onto methine carbons is greater than that onto methylene carbons. Most maleic anhydride are grafted onto squalane in form of single unit due to the inter and intramolecular hydrogen transfer.
出处
《应用化学》
CAS
CSCD
北大核心
2000年第3期256-259,共4页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金! (5 98730 2 2 )
"九七三"项目 !(G19990 6 480 6 )
关键词
乙丙共聚物
接枝反应
角鲨烷
马来酸酐
乙丙橡胶
ethylene propylene copolymer,grafting reaction,squalane,maleic anhydride,simulation investigation
