WATER-ABSORPTION EFFECTS ON THE THERMAL TRANSITION AND STIFFNESS OF ETHYLENE IONOMERS

被引：20

作者：

TACHINO, H ^{[1
]}

HARA, H ^{[1
]}

HIRASAWA, E ^{[1
]}

KUTSUMIZU, S ^{[1
]}

YANO, S ^{[1
]}

机构：

[1] GIFU UNIV,FAC ENGN,DEPT CHEM,GIFU 50111,JAPAN

来源：

JOURNAL OF APPLIED POLYMER SCIENCE | 1995年 / 55卷 / 01期

关键词：

D O I：

10.1002/app.1995.070550115

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Changes in the thermal transition and stiffness of ionomers occurring during aging or water absorption were investigated. Ionomers used in this study are Na, K, Mg, and Zn salts of poly(ethylene-co-methacrylic acid) (EMAA), whose methacrylic acid unit is 5.4 mol %. It was found that ionomer stiffness is subject to water absorption and the effect differs with the neutralizing cations. Water absorption effects on the thermal transition, measured by differential scanning calorimetry (DSC), indicate that there are no significant changes in the higher-temperature endotherm assigned to a melting of polyethylene (PE) crystallites. However, the lower-temperature endotherm, which we attribute to an order-disorder transition of ionic aggregates (T(i)), exhibits significant changes upon water absorption. The mechanism of the water absorption effects on the thermal transition and stiffness is described. (C) 1995 John Wiley & Sons, Inc.

引用

页码：131 / 138

页数：8

共 25 条

[1]

[Anonymous], 1970, MACROMOLECULES, DOI DOI 10.1021/MA901668W

[2]

Bonotto S., 1968, MACROMOLECULES, V1, P510

[3] MODEL FOR THE CLUSTERING OF MULTIPLETS IN IONOMERS [J].