甲基丙烯酸三丁基锡酯与甲基丙烯酸甲酯共聚物的分子量测定和K、α值的订定

Determination of Molecular Weight and K,α Values for Copolymers of Tri-n-butyltin Methacrylate and Methyl Methacrylate

研究了不同投料比的甲基丙烯酸三丁基锡酯 (TBTMA)与甲基丙烯酸甲酯 (MMA)共聚物的合成和分级方法 ,测定了各级分的分子量和对应的特性粘数 ,订定了 Mark-Houwink方程式的 K、α值 .当n(TBTMA)∶ n(MMA) =1∶ 1时 ,K=0 .2 2 5,α=0 .4 6,d=2 .3 2 .当 n(TBTMA)∶ n(MMA) =1∶ 2时 ,K=1 .69× 1 0 - 4 ,α=1 .1 8,d=1 .2

Synthesis and fractionation of copolymes of tri n butyltin methacrylate(TBTMA) with MMA have been investigated. The fractionated molecular weight and corresponding [ η ] of copolymers and K and α values in Mark Houwink equation of copolymers have been determined. In case of TBTMA∶MMA=1∶1 (feed molar ratio), K =0 225, α =0 46, the distribution of molecular weight d is 2 32 and in case of TBTMA∶MMA=1∶2 (feed molar ratio), K =1 69×10 -4 , α =1 18, d =1 23.