Crystallizable Polyphenylacetylene-Preparation and Solution Properties
作者:
B. Biyani,
A.J. Campagna,
D. Daruwalla,
C.M. Srivastava,
P. Ehrlich,
期刊:
Journal of Macromolecular Science: Part A - Chemistry
(Taylor Available online 1975)
卷期:
Volume 9,
issue 3
页码: 327-339
ISSN:0022-233X
年代: 1975
DOI:10.1080/00222337508065859
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The molecular weight distribution (MWD) of crystallizable polyphenylacetylene prepared near room temperature in the presence of ferric acetylacetonate and triethylaluminum was determined through use of fractions characterized by vapor pressure osmometry and gel permeation chromatography (GPC). The number- and weight-average molecular weights (MnandMw) are both less than the molecular weight corresponding to the maximum of the weight distribution function, which lacks a high molecular weight tail.MwandMnis less than is consistent with models allowing for chain termination characteristic of vinyl polymers. GPC elution volumes are much less than those characteristic of polystyrene of similar molecular weight, and the Mark-Houwink exponent is high (2.4 forMv4800 to 6800). These data indicate more rodlike behavior than for polystyrene of equivalent molecular weight. The MWD and other data suggest intramolecular chain termination, possibly associated with the molecule's tendency to form paramagnetic defect states.
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