Cationic copolymerization of cyclic ketene acetals: The effect of substituents on reactivity

被引：0
|
作者：
Wu, ZH [1 ]
Cao, LW [1 ]
Pittman, CU [1 ]
机构：
[1] Mississippi State Univ, Dept Chem, Univ Ind Chem Res Ctr, Mississippi State, MS 39762 USA
来源：
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY | 1998年 / 36卷 / 06期
关键词：
2-methylene-1,3-dioxane; 4-methyl-2-methylene-1,3-dioxane; 4,4,6-trimethyl-2-methylene-1,3-dioxane; 2-methylene-1,3-dioxolane; 4-methyl-2-methylene-1,3-dioxolane; 4,5-dimethyl-2-methylene-1,3-dioxolane; cationic copolymerization; reactivity ratio; relative reactivity; ring-retained polymerization; cyclic ketene acetals;
D O I：
10.1002/(SICI)1099-0518(19980430)36:6<861::AID-POLA1>3.3.CO;2-O
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Cationic copolymerizations of 4-methyl-2-methylene-1,3-dioxane, 2 (M-1), with 2-methylene-1,3-dioxane, 1 (M-2); of 4,4,6-trimethyl-2-methylene-1,3-dioxane, 3 (M-1), with 2-methylene-1,3-dioxane, 1 (M-2); of 4-methyl-2-methylene-1,3-dioxolane, 5 (M-1), with 2-methylene-1,3-dioxolane, 4 (M-2); and of 4,5-dimethyl-2-methylene-1,3-dioxolane, a (M-1), with 2-methylene-1,3-dioxolane, 4(M-2) were conducted. The reactivity ratios for these four types of copolymerizations were r(1) = 1.73 and r(2) = 0.846; r(1) = 2.26 and r(2) = 0.310; r(1) = 1.28 and r(2) = 0.825; r(1) = 2.23 and r(2) = 0.515, respectively. The relative reactivities of these monomers towards cationic polymerization are: 3 > 2 > 1; and 6 > 5 > 4. With both five-and six-membered ring cyclic ketene acetals, the reactivity increased with increasing methyl substitution on the ring. (C) 1998 John Wiley & Sons, Inc.
引用
收藏
页码：861 / 871
页数：11
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