期刊
MACROMOLECULAR CHEMISTRY AND PHYSICS
卷 212, 期 18, 页码 1987-1998出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/macp.201100228
关键词
conjugated polymers; degradation; gel permeation chromatography (GPC); isomers/isomerization; polyacetylenes
资金
- Ministry of Education of the Czech Republic [MSM0021620857]
- Czech Science Foundation [203/09/0803, P108/11/1661, 203/08/H032]
- Science Foundation of Charles University [315/2008 B-CH]
Newly prepared high-cis poly(2,4-difluorophenylacetylene) is found to undergo simultaneous cis-to-trans isomerization and degradation during aging in THF-d(8) solution exposed to the atmosphere. Partly aged polymers contain two microstructurally differing fractions: deeply isomerized macromolecules of lower MW and microstructurally unperturbed high-cis macromolecules of higher MW. SEC/DAD provides an unambiguous distinction and UV-Vis characterization of these fractions. The non-uniform MW distribution of isomerized and high-cis macromolecules is assumed to result from acceleration of degradation of polymer chains by simultaneous cis-to-trans isomerization.
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