Chain‐configurational properties of novolac phenol–formaldehyde resins
作者:
Fred L. Tobiason,
Greg H. Cain,
Steve M. Gregory,
期刊:
Journal of Polymer Science: Polymer Chemistry Edition
(WILEY Available online 1978)
卷期:
Volume 16,
issue 3
页码: 659-666
ISSN:0360-6376
年代: 1978
DOI:10.1002/pol.1978.170160310
出版商: John Wiley&Sons, Inc.
数据来源: WILEY
摘要:
AbstractRotational isomeric‐state chain‐configurational calculations have been applied to the novolac phenol–formaldehyde structure. Steric interference allows the chain to be considered with a twofold potential energy barrier model. Computations that fit the observed dipole‐moment data over a range of molecular weights indicate that the conformational angle is near ±80°, with theg±g=states on the average being 155 cal/mole below theg±g±states. The limiting dipole‐moment ratio is computed to be 1.47, compared to the experimental value of 1.48. A negative temperature coefficient agrees in sign with the experimental value, and the characteristic ratio of the end‐to‐end molecular dimensions is calculated to be 3.27, as compared to the experime
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