取代基对系列有机锡单体与MMA共聚活性的影响

本文采用红外光谱技术测定了共聚物的组成,用最小二乘曲线拟合法计算了甲基丙烯酸三甲基锡酯(TMTM),三乙基锡酯(TETM),三丁基锡酯(TBTM),和三苯基锡酯(TPTM)与甲基丙烯酸甲酯(MMA)的共聚合竞聚率,其数值分别为:r_1=1.07,r_2=0.63(TMTM/MMA);0.87,0.62(TETM/MMA);0.62,0.58(TBTM/MMA);0.68,0.60(TPTM/MMA),并计算了各单体的δ和e值,讨论了不同取代基结构对其共聚合相对活性的影响。

EFFECT OF THE DIFFERENT SUBSTITUENT ON POLYMERIZATION ACTIVITY OF A SERIES OF ORGANOTIN MONOMERS

In the present work, the reactivity ratios of trimethyltin (TMTM), triethyltin (TETM), tributyltin (TBTM) and triphenyltin (TPTM) methacrylates with methyl methacrylate (MMA) have been determined. The experimental determination of the copolymer compositions formed from several different comonomer feed compositions involves the technique of FTIR spectros-copy. The nonlinear least-squares procedure is employed in estimating the r1 and r2 values which are 1.07/0.63 (TMTM/MMA); 0.87/0.62 (TETM/MMA); 0.62/0.58 (TBTM/MMA); 0.68/0.60 (TPTM/MMA), respectively. The Q and e values of these trialkyltin methacrylate monomers have been calculated. The relative reactivities of the organotin monomers have been compared and the effect of the different substituent on their copolymerization activity has been discussed.