Melt blends of san with phenoxy
作者:
ChiHoon Choi,
SooMin Lee,
ByungKyu Kim,
期刊:
Journal of Macromolecular Science, Part B
(Taylor Available online 1994)
卷期:
Volume 33,
issue 3-4
页码: 317-332
ISSN:0022-2348
年代: 1994
DOI:10.1080/00222349408248095
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Melt blends of styrene-co-acrylonitrile (SAN) with phenoxy were prepared over a full range of compositions and were evaluated in terms of morphological, rheological, thermal, and mechanical properties. Viscosity-composition plots showed a crossover with the additivity line at 50/50 (SAN/phenoxy by weight), and deviations from semicircles in Cole‐Cole plots were seen for 70/30, 50/50, and 30/70 blends. Scanning electron micrographs (SEM) of the blends showed a two-phase morphology with a finer dispersion and well-elongated fibrils seen when SAN formed the dispersed phase. The glass transition temperature (Tg) of SAN was almost unchanged in the blends, whereasTgof phenoxy was increased over 5°C. Tensile modulus and strength generally showed synergistic effects in phenoxy-rich blends. In the 10/90 blend, the ultimate elongation was greater than for pure phenoxy, and a dramatic drop of Izod impact strength was observed.
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