Ethylene-co-vinyl alcohol blends
作者:
M.M. Coleman,
X. Yang,
H. Zhang,
P.C. Painter,
期刊:
Journal of Macromolecular Science, Part B
(Taylor Available online 1993)
卷期:
Volume 32,
issue 3
页码: 295-326
ISSN:0022-2348
年代: 1993
DOI:10.1080/00222349308215486
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The presence of the aliphatic hydroxyl group in poly(ethylene-co-vinyl alcohol) (EVOH) suggests that these copolymers have the potential for forming miscible blends with a variety of polymers containing complementary functional groups such as esters, (meth)acrylates, acetoxys, pyridines, etc. There is a paucity of examples of miscible EVOH blends in the literature, however. Hydrogen bonding, which is very complicated in EVOH copolymers and involves an extraordinary variety of nter- and intramolecular species, plays an important role in the phase behavior of EVOH blends. We have applied an association model to this problem and arrived at the following important conclusion. Miscibie EVOH blends with polymers containing ester or acetoxy groups do exist, but they have lower critical solution temperatures below normal processing temperatures (< 200 °C). This is primarily a consequence of the fact that EVOH copolymers are strongly self-associated, while the interassociation of the hydroxyl groups of EVOH with the carbonyl groups of the complementary polymers is comparatively weak.
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