The Stereochemistry of Styrene-Maleic Anhydride Copolymers:13C-NMR Study and Pvcilo and Indo/1 Calculations
作者:
GeorgeB. Butler,
ChoonH. Do,
MichaelC. Zerner,
期刊:
Journal of Macromolecular Science: Part A - Chemistry
(Taylor Available online 1989)
卷期:
Volume 26,
issue 8
页码: 1115-1135
ISSN:0022-233X
年代: 1989
DOI:10.1080/00222338908052038
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The stereochemistry of alternating copolymers of styrene (ST) with maleic anhydride (MA) was examined by13C-NMR spectroscopy, and the stabilization energies and the most stable geometries of complexes and adducts between ST and MA were calculated by the PVCILO program and by INDO/1. The methine and carbonyl carbon atoms of the MA portion and the quaternary carbon atom of the ST portion reveal different stereochemistries due to various polymerization conditions, suggesting that the donor-acceptor complex may participate in the co-polymerization. The complex postulated according to the Diels-Alder geometry was more stable than that according to [2+2] cycloaddition geometry. It is believed that the stabilization energy is so great that the copolymerization occurs spontaneously via forming a donor-acceptor complex and adducts. The geometries of 1:1 adducts formed by endo and exo approaches in the Diels-Alder geometry mode were also calculated.
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