Copper mediated controlled radical copolymerization of styrene and 2-ethylhexyl acrylate and determination of their reactivity ratios
Copper mediated controlled radical copolymerization of styrene and 2-ethylhexyl acrylate and determination of their reactivity ratios
复制标题
铜介导的苯乙烯与丙烯酸2-乙基己酯的受控自由基共聚及其反应活性比的测定
作者：
B. P. Koiry;N. Singha
共聚是一种重要的合成手段，用于制备具有不同均聚物难以达到的理想性能组合的聚合物。本文报道了以溴化铜（cur）为催化剂，N，N,N ',N″，N″-五甲基二乙烯三胺（PMDETA）为配体，1-苯乙基溴化剂（PEBr）为引发剂，丙烯酸乙酯（EHA）与苯乙烯的共聚反应。线性动力学图和分子量随转化率的线性增长表明共聚反应是可控的。通过1H NMR研究计算共聚物的组成。采用Finemann-Ross （FR）法、倒Finemann-Ross （IFR）法和Kelen-Tudos （KT）法测定苯乙烯与EHA （r1和r2）的反应比。并用热重分析（TGA）和差热分析（DSC）研究了共聚物的热性能。
Copolymerization is an important synthetic tool to prepare polymers with desirable combination of properties which are difficult to achieve from the different homopolymers concerned. This investigation reports the copolymerization of 2-ethylhexyl acrylate (EHA) and styrene using copper bromide (CuBr) as catalyst in combination with N,N,N′,N″,N″- pentamethyldiethylenetriamine (PMDETA) as ligand and 1-phenylethyl bromide (PEBr) as initiator. Linear kinetic plot and linear increase in molecular weights vs. conversion indicate that copolymerization reactions were controlled. The copolymer composition was calculated using 1H NMR studies. The reactivity ratio of styrene and EHA (r1 and r2) were determined using the Finemann–Ross (FR), inverted Finemann–Ross (IFR), and Kelen–Tudos (KT) methods. Thermal properties of the copolymers were also studied by using TGA and DSC analysis.