不同纤维素原料上接枝合成ATRP大分子用引发剂的研究

Study on Synthesis of Cellulose-based Initiator for ATRP Reaction

原子转移自由基聚合(ATRP)备受瞩目,因使用该方法合成聚合物具有可控性。将该方法用于纤维素接枝共聚,就可能在纤维素上接枝功能性聚合物。在此类方法中能够决定ATRP反应成败的重要因素之一就是ATRP引发剂制备。本文以纳米纤维素(CNC)、微晶纤维素(MCC)、漂白桉木浆、未漂桉木浆为原料,以4-二甲氨基吡啶(DMAP)为催化剂,三乙胺(TEA)和四氢呋喃(THF)为溶剂在近乎无水的条件下与2-溴异丁酰溴酰化制备了可用于ATRP反应的重要的大分子引发剂。并通过红外、XPS等比较其接枝状况,为纤维素进行ATRP接枝聚合提供理论基础。

Recently, atom transfer radical polymerization （ATRP） has been attracting a lot of attention because the polymerization can be controlled with this method. When ATRP is applied in grafting of cellulose, various function materials can be manufactured based on cellulose raw materials. Among the factors affecting the ARTP reaction, the initiator for the ATRP is significant. Herein, the cellulose nanocrystal, cellulose microcrystalline, bleached eucalyptus pulp and unbleached eucalyptus pulp were used as raw materials to prepare cellulose based macromolecule initiator reacted with 2 -bromoisobuturyl bromide in the presence of catalyst DMAP and solvents TEA/THF. The products were characterized, and the surface grafting rates of cellulose nanocrystal were 49. 89% and 16.28% , respectively. The pulp samples can be grafted, but the provide a view for ATRP with cellulosic raw materials. and cellulose microcrystalline rate is low. These results can