自由基调聚法合成聚丙烯酸叔丁酯调聚物  

Synthesis of poly(tert-butyl acrylate)telomer by free-radical telomerization

作　　者：李光华[1] 杨苹苹[1] 赵治巨[1] 高振胜[1] 何丽秋[1] 童张法[1] 

机构地区：[1]广西大学化学化工学院,广西南宁530004

出　　处：《化工学报》2011年第7期2061-2066,共6页CIESC Journal

基　　金：教育部留学回国人员科研启动基金项目([2008]890);广西大学科研基金项目(X071018)~~

摘　　要：以丙烯酸叔丁酯（tBA）为单体,CBr4为调聚剂,利用自由基调聚反应,合成了末端有—CBr3基团的聚丙烯酸叔丁酯（PtBA-Br）调聚物。利用GPC和1H NMR对PtBA-Br的数均分子量（Mn）进行了测定,其值为2730~9200。为了准确地控制调聚物的分子量,利用Mayo方程和模拟的方法得到了CBr4对丙烯酸叔丁酯聚合的链转移常数值（Cs）,在60℃下,其值为1.11。当单体的转化率由25%增加到73%时,调聚物的Mn为5940~6450,这与理论模拟值是一致的,并且分子量分布小于1.70。Poly（tert-butyl acrylate）（PtBA）telomer with tribromomethyl end group was synthesized by radical telomerization of tert-butyl acrylate（tBA）with CBr4 as telogen and 2,2′-azobisisobutyronitrile（AIBN）as initiator.The number-average molecular weight（Mn）of PtBA-Br telomers was determined by GPC and 1H NMR,and PtBA-Br telomers with Mn of 2730—9200 were obtained.The Mncalculated from 1H NMR spectrum matched well with the Mn,GPC results.In order to accurately control the molecular weight of PtBA-Br telomers,the chain transfer constant（Cs）of CBr4 was determined by using the Mayo equation and simulation,and the value was 1.11 at 60℃.When the ratio of telogen and monomer concentration was 0.02,the Mnof PtBA-Br telomers at 60℃ was between 5940 and 6450 at increased conversion from 25% to 73%.The Mn values were consistent with simulation results and the molecular weight distributions were all under 1.70.

关 键 词：丙烯酸叔丁酯 自由基调聚反应 链转移常数 模拟 

分 类 号：O632.5[理学—高分子化学]