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Structural Reasons for Restricted Backbone Motion in Poly( n ‐alkyl methacrylates): Degree of Polymerization, Tacticity and Side‐Chain Length
Author(s) -
Wind Michael,
Graf Robert,
Renker Sabine,
Spiess Hans Wolfgang
Publication year - 2005
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.200400219
Subject(s) - tacticity , alkyl , polymer chemistry , polymerization , monomer , methacrylate , degree of polymerization , polymer , relaxation (psychology) , materials science , side chain , chemistry , organic chemistry , composite material , psychology , social psychology
Summary: The complex dynamics of poly( n ‐alkyl methacrylates) is studied by advanced 13 C NMR spectroscopy as well as mechanical and dielectric relaxation. Extended backbone conformations are identified as the molecular units involved in structural relaxation. From the variation in the degree of polymerization and a comparison with the presence of stereoregular sequences in the sample, the length of the extended units is determined to involve about five, at most ten monomeric units. Syndiotactic and isotactic sequences behave similarly. These findings are indicative of locally structured polymer melts.