Toward microphase separation in epoxy systems containing PEO-PPO-PEO block copolymers by controlling cure conditions and molar ratios between blocks

被引：22

作者：

Larranaga, M. ^{[1
]}

Martin, M. D. ^{[1
]}

Gabilondo, N. ^{[1
]}

Kortaberria, G. ^{[1
]}

Eceiza, A. ^{[1
]}

Riccardi, C. C. ^{[1
]}

Mondragon, I. ^{[1
]}

机构：

[1] Univ Basque Country, Escuela Politecn, Dept Ing Quim & Med Ambiente, Mat & Technol Grp, San Sebastian 20018, Spain

来源：

COLLOID AND POLYMER SCIENCE | 2006年 / 284卷 / 12期

关键词：

epoxy; triblock copolymers; cure kinetics; mechanistic approach;

D O I：

10.1007/s00396-006-1512-9

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Nanostructuring of thermosetting systems using the concept of templating and taking advantage of the self-assembling capability of block copolymers is an exciting way for designing new materials for nanotechnological applications. In this first part of the work, reactive blends based on stoichiometric amounts of a diglycidylether of bisphenol-A epoxy resin and 4,4'-diaminodiphenylmethane cure agent modified with three poly(ethylene oxide)-co-poly(propylene oxide)-co-poly(ethylene oxide) block copolymers were studied. Cure advancement of these systems was analyzed by differential scanning calorimetry. The experimental results show a delay of cure rate, which increases as copolymer content and PEO molar ratio in the block copolymer rise. Infrared spectroscopy shows that PEO block is mainly responsible of physical interactions between the hydroxyl groups of growing epoxy thermoset and ether bonds of block copolymer. These interactions are mainly responsible for the delaying of cure kinetics. The molar ratio between blocks also has a critical influence on the delaying of the cure rate. A mechanistic approach of cure kinetics allows us to relate the delay of cure as a consequence of block copolymer adding to physical interactions between components.

引用

页码：1403 / 1410

页数：8