nBA与HEA的共聚合及其竞聚率测定  

Copolymerization and Reactivity Ratio Measurement of n-Butylacrylate and Hydroxyethyl Acrylate

作　　者：邓双辉[1] 叶沪平 姜丹凤[1] 范传杰[1] 林群芳[3] 赵婧婧[1] 周晓东[1] 

机构地区：[1]华东理工大学化学工程联合国家重点实验室,上海200237 [2]上海通用识别技术研究所,上海201112 [3]华东理工大学材料科学与工程学院,上海200237

出　　处：《工程塑料应用》2013年第9期92-95,共4页Engineering Plastics Application

摘　　要：采用原子转移自由基聚合一步加料的方法,以α-溴代异丁酸乙酯为引发剂,溴化亚铜/N,N,N′,N′,N″-五甲基二亚乙基三胺为催化体系,环己酮为溶剂,于70℃下进行了丙烯酸正丁酯(nBA)与丙烯酸羟乙酯(HEA)的共聚合反应。采用傅立叶变换红外光谱、核磁共振氢谱、凝胶渗透色谱和动态力学分析等对共聚物进行了表征和测试,证实了无规共聚物PnBA-co-PHEA的成功合成,且其分子量分布较窄(<2.0),只具有一个玻璃化转变温度,其值为–27.35℃。通过改变单体投料比来分析共聚物组成,然后由拓展的Kelen-Tüdos法计算了两种单体的竞聚率分别为r HEA=1.505和r nBA=0.894,表明PnBA-co-PHEA确为无规共聚物。Atom transfer radical polymerization （ATRP） was employed to prepare the copolymer of n-butylacrylate （nBA） and hydroxyethyl acrylate （HEA）. The copolymerization reactions were carried out at 70 ℃ with ethyl 2-bromoisobutyrate as the initiator, copper bromide / N, N, N＇, N＇, N＂-pentamethyldi-ethylenetriamine as the catalyst system, and the cyclohexanone as the solvent. The copolymer products were characterized by fourier transform infrared spectroscopy, Xhydrogen-nuclear magnetic resonance, gel permeation chromatography and dynamic mechanical analysis. The results show that the random copolymer PnBA- co-PGMA is successfully synthesized via ATRP, its molecular weight distribution is very narrow and it has only a glass transition temperature which is -27.35 ℃. Through changing the monomer feeding ratio of HEA and nBA, the composition of the copolymer was analyzed. Finally, using the extended Kelen-Ttidos method from the copolymer composition datum, the monomer reactivity ratios were calculated to be rHEA=l.505 and rnBA=0.894 respectively, which illustrates that the copolymer PnBA-co-PGMA is really a random copolymer.

关 键 词：丙烯酸正丁酯 丙烯酸羟乙酯 原子转移自由基聚合法 竞聚率 

分 类 号：O631.5[理学—高分子化学]