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Home  >  Journal list  >  Polymer Journal  >  Vol.32  No.4 (2000)  >  pp.361-369

Polymer Journal
<<Previous article Vol.32  No.4 (2000)   pp.361 - 369 Next article>>

Determination of Stereochemical Compositions of Oligo- and Poly(α-methylstyrene)s by 1H and 13C NMR

Masashi OSA1), Masakazu SUMIDA1), Takenao YOSHIZAKI1), Hiromi YAMAKAWA1), Koichi UTE2), Tatsuki KITAYAMA2) and Koichi HATADA2)
1) Depertment of Polymer Chemistry, Kyoto University, Kyoto 606-8501, Japan
2) Department of Chemistry, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan


ABSTRACT:  A set of oligo- and poly(α-methylstyrene) samples were prepared by anionic polymerization, giving particular attention to the polymerization temperature and the initial monomer concentration. The samples were characterized by 1H and 13C NMR spectroscopy and also by three kinds of two-dimensional NMR spectroscopy. It is shown that they have almost the same value 0.72±0.01 of the fraction fr of racemo diads independent of molecular weight, indicating that they are adequate for a study of dilute polymer solutions within the new framework of polymer solution science based on the helical wormlike chain model.


Keyword:
Poly(α-methylstyrene)/ α-Methylstyrene Oligomer/ 1H Nuclear Magnetic Resonance/ 13C Nuclear Magnetic Resonance/ 2D Nuclear Magnetic Resonance/ Gauge-Independent Atomic Orbital Method/ Modified Neglect of Diatomic Overlap Method/ Stereochemical Composition/ Helical Wormlike Chain

Published online: June 29, 2001
© Copyright, 2000 by The Society of Polymer Science, Japan

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