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SEC/DAD and 1 H NMR Study of Molecular Weight and Configurational Stability of Poly(2,4‐difluorophenylacetylene) and Polyphenylacetylene Prepared with Rh Catalyst
Author(s) -
Trhlíková Olga,
Zedník Jiří,
Vohlídal Jiří,
Sedláček Jan
Publication year - 2011
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201100228
Subject(s) - macromolecule , isomerization , polymer , degradation (telecommunications) , catalysis , chemistry , polymer chemistry , molar mass distribution , characterization (materials science) , materials science , organic chemistry , nanotechnology , telecommunications , biochemistry , computer science
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.