Wideline NMR studies of polyacrylonitrile
作者:
P. E. McMahon,
期刊:
Journal of Polymer Science Part A‐2: Polymer Physics
(WILEY Available online 1967)
卷期:
Volume 5,
issue 2
页码: 271-276
ISSN:0449-2978
年代: 1967
DOI:10.1002/pol.1967.160050203
出版商: John Wiley&Sons, Inc.
数据来源: WILEY
摘要:
AbstractNMR linewidth studies of molecular motion in several polyacrylonitrile samples have been carried out. The motional transition temperature is found in the 105–124°C. range and depends upon polymerization conditions. In addition, the thermal activation energy for the motional process underlying this transition was evaluated at 16.4 kcal./mole. Finally, measurement of the transition temperature for one of the specimens in three different physical states (bulk, spun only, and spun and drawn with a ratio of 3:1), revealed that no change in the transition temperature was effected by either spinning or drawi
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