摘要
在氯化1-烯丙基-3-甲基咪唑([AMIM]Cl)离子液体中,采用原子转移自由基(ATRP)法接枝改性微晶纤维素,合成了微晶纤维素-g-甲基丙烯酸二乙氨基乙酯(MCC-g-PDEAEMA)聚合物分子刷。通过加入助溶剂形成均相反应体系,解决了功能性单体甲基丙烯酸二乙氨基乙酯(DEAEMA)在[AMIM]Cl离子液体中的溶解问题。分别研究了离子液体中均相与非均相的反应机理,结果表明:在均相体系中,生成的反应副产物PDEAEMA较少,聚合物分子刷的接枝效率较高,分子量分布窄,ATRP反应可控性好。实验确定了均相体系最佳反应条件:Cu Br/PMDETA/DEAEMA/乙醇的摩尔比为1:15:150:300,MCC-g-PDEAEMA的接枝效率可达78.1%。通过红外、核磁和GPC对聚合物表征发现,侧链PDEAEMA成功地接枝到微晶纤维素骨架上,生成的聚合物分子刷的分子量分布均匀。
The microcrystalline cellulose-g-poly[2-（diethylamino）ethyl methacrylate] （MCC-g-PDEAEMA） polymer brushes were synthesized under control by atom transfer radical polymerization （ATRP） in the ionic liquid 1-allyl-3-methylimidazolium chloride （[AMIM]Cl）. Ethyl alcohol was used as the cosolvent to form a homogeneous system and solve the problem that the functional monomerN,N-diethylamino-2-ethyl methacrylate （DEAEMA） hardly dissolved in [AMIM]Cl. The synthetic mechanism of heterogeneous system and homogeneous system in [AMIM]Cl was analyzed. The experiments showed that the byproduct PDEAEMA in the homogeneous system was reduced and the grafting efficiency of the polymer brushes was improved. Meanwhile, the molecular weight distribution was narrow and ATRP was easily controlled. Optimum reaction conditions in the homogeneous system were attained at CuBr/PMDETA/DEAEMA/ethyl alcohol molar ratio of 1：15：150：300. The grafting efficiency could reach to 78.1%. MCC-g-PDEAEMA was characterized through FTIR spectroscopy,1H NMR spectroscopy and GPC. The results proved that the PDEAEMA side chains were covalently bonded to the MCC backbone and the molecular weight distribution of the polymer brushes were even.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2015年第10期4275-4280,共6页
CIESC Journal
基金
国家自然科学基金项目(21304030)
河北省自然科学基金项目(B2013208183)~~
关键词
离子液体
ATRP
微晶纤维素
界面
均化作用
ionic liquid
ATRP
microcrystalline cellulose
interface
homogenization
