纤维素-甲基丙烯酸丁酯的原子转移自由基聚合

tAtom transfer radical polymerization of Cellulose-butyl methacrylate

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）。成功地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、1H-NMR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、溶剂对聚合物分子量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 。

Abstract:

A well-defined graft polymer cellulose and poly butyl methacrylate was synthesized by atom transfer radical polymerization with cellulose –Br which was synthesized by2 – bromopropionyl bromide and cellulose in ionic liquid[AMIM]Cl, CuBr and PMDETA as initiating system , DMF as solvent. The macroinitiator and polymers were confirmed by means of FTIR , 1H-NMR and GPC. The experiment studied the polymerization activity and the impact on polymer molecular weight and molecular weight distribution by time, catalytic systems ,solvent and other characteristics. The results show that reaction conversion rate increased linearly with time, the process is active and controlled polymerization, the reaction process used PMDETA / CuBr and DMF is more efficient.