摘要
以2-溴异丁酰溴为溴化剂,在离子液体([Amim]Cl)中与纤维素反应制备溴化纤维素大分子引发剂,以溴化纤维素/CuBr/N,N',N',N″,N″-五甲基二乙烯基三胺(PMDETA)为引发体系,N,N-二甲基甲酰胺(DMF)为溶剂,研究了甲基丙烯酸丁酯(BMA)的原子转移自由基聚合反应(ATRP)。合成了结构明晰的以纤维素为主链,聚甲基丙烯酸丁酯为支链的接枝共聚物Cellulose-g-PBMA。通过FTIR、1HNMR和GPC分别对大分子引发剂和接枝聚合物进行了分析。考察了聚合反应的活性特征,反应时间、催化体系、溶剂对聚合物相对分子质量(简称分子量,下同)及分子量分布的影响。结果表明,聚合反应转换率随时间呈线性增加,反应过程是活性可控聚合,催化剂和溶剂分别选用PMDETA/CuBr和DMF使反应更高效。
The atomic transfer radical polymerization of butyl methacrylate was studied by using 2- bromopropionyl bromide as brominating agent which reacted with cellulose in the preparation of brominated cellulose in ionic liquids （ [ Amim ] Cl）. The brominated cellulose/CuBr/PMDETA was selected as the initiator and the DMF as solvent. A well-defined graft polymer cellulose and poly butyl methacrylate was synthesized. FTIR, ^1HNMR and GPC were adopted to analyze the macromolecular initiator and the graft polymer. The characteristics of the activity of polymerization and the influence of reaction time, catalyst system and solvent on polymer molecular weight and molecular weight distribution were investigated. The results show that the reaction conversion rate increased linearly with time, the process was one of active and controlled polymerization, and the reaction process was more efficient when PMDETA/CuBr was used as catalyst and DMF as solvent.
出处
《精细化工》
EI
CAS
CSCD
北大核心
2012年第6期611-614,620,共5页
Fine Chemicals
基金
国家自然科学基金项目(20474003
90401028)~~
