Polyblends of poly(styrene-b-butadiene-b-styrene) and polystyrene. II. Electron microscopy
作者:
M. Niinomi,
G. Akovali,
M. Shen,
期刊:
Journal of Macromolecular Science, Part B
(Taylor Available online 1977)
卷期:
Volume 13,
issue 1
页码: 133-150
ISSN:0022-2348
年代: 1977
DOI:10.1080/00222347708208758
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Electron micrographs of a series of polyblends of poly(styrene-b-butadiene-b-styrene (SBS) and polystyrene (PS) are presented. These poly blends were cast from three different solvents, i.e., tetrahydrofuran—methyl ethyl ketone (THF/ MEK), benzene—heptane, and carbon tetrachloride. PS of four different molecular weights were used. It is shown that when the molecular weight of PS exceeds that in the block copolymer, a third phase in the form of “islands” is formed. Lamellarlike structures are formed in the block domains upon the addition of homopolymer. Stretching perturbs the morphology of the block domains somewhat, and produces craze marks in the PS islands. The craze marks are removed upon annealing. These results are discussed in conjunction with the observed mechanical behavior of the same polyblends reported in Part I of this series.
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