文献类型：期刊文献

中文题名：BMA和MMA共聚合参数的测定与研究

英文题名：DETERMINATION AND STUDY ON REACTIVITY RATIOS OF BUTYL METHACRYLATE AND METHYL METHACRYLATE

作者：韩哲文[1];陆琛[1];吴玉芳[1];吴平平[1];朱清仁[2]

机构：[1]华东理工大学高分子材料系;[2]中国科技大学结构成分分析开放实验室

年份：1997

卷号：13

期号：S1

起止页码：29

中文期刊名：高分子材料科学与工程

外文期刊名：Polymer Materials Science & Engineering

收录：CSTPCD;;Scopus;北大核心:【北大核心1996】；CSCD:【CSCD2011_2012】；

语种：中文

中文关键词：甲基丙烯酸丁酯;甲基丙烯酸甲酯;共聚合反应;竞聚率

外文关键词：butyl methacrylate, methyl methacrylate, reactivity ratio, copolymerization

摘要：用敏感点法设计实验，通过核磁共振方法测定甲基丙烯酸丁酯（ＢＭＡ，Ｍ１）和甲基丙烯酸甲酯（ＭＭＡ，Ｍ２）共聚物的组成，用Ｅｒｒｏｒ－ｉｎ－ＶａｒｉａｂｌｅＭｅｔｈｏｄ（ＥＶＭ）计算方法求得在６０、８０、１００、１２０和１４０℃时自由基本体聚合时体系的竞聚率，分别为（ｒ１＝１．０１９８，ｒ２＝０．９９４６）、（１．０００．１．０３８）、（１．０６１４，０．９９２７）、（１．００８８，１．００１７）、（１．０９６２，１．０２０８）。以及温度对竞聚率的影响，由竞聚率的结果表明，这一对单体从共聚合角度看，其结构非常相似，共聚合反应接近于理想共聚合。
n this study, comonomer mixtures of butyl methacrylate(BMA,M1) and methyl methacrylate(MMA,M2) were prepared at two sensitive points: f1=0.67,f1=0.33, which were calculated by equations f1=2/(2+r1) and f1=r2/(2+r2) with literature data. Copolymerization were carried out at 60, 80, 100, 120 and 140 ℃ while AIBN was used as initiator. After purification, the copolymers were analyzed by 1HNMR, and the compositions were calculated by peak areas of -OCH2- of BMA and -OCH3 of MMA. The relative reactivity ratios and 95% joint confidence intervals are calculated by ErrorinVariable Method(EVM) to be find (r1=1.0198,r2=0.9946), (1.000.1.038), (1.0614,0.9927), (1.0088,1.0017), (1.0962,1.0208) at different of temperatures With the obtained reactivity ratios, the effect of temperature on copolymer compositions were studied. The ratios of frequency factors, Aii/Aij, the difference of activation energies (ΔEii-ΔEij), entropies (ΔS≠ii-ΔS≠ij) and ethalpies (ΔH≠ii-ΔH≠ij) between homopropagation and heteropropagation were caculated through the linear relationship between lnr and 1000/T.