Kontaktujte nás | Jazyk: čeština English
Název: | Estimation of conformational characteristics of bisphenol-A based poly(hydroxyethers) | ||||||||||
Autor: | Kaštánek, Alois; Podzimek, Štěpán; Dostál, Jiří; Šimek, Lubomír; Bohdanecký, Miloslav | ||||||||||
Typ dokumentu: | Recenzovaný odborný článek (English) | ||||||||||
Zdrojový dok.: | Polymer. 2000-04, vol. 41, issue 8, p. 2865-2870 | ||||||||||
ISSN: | 0032-3861 (Sherpa/RoMEO, JCR) | ||||||||||
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DOI: | https://doi.org/10.1016/S0032-3861(99)00474-7 | ||||||||||
Abstrakt: | Two samples of bisphenol-A based epoxy resins (poly(hydroxy ethers)) were fractionated by precipitation. The fractions were characterized by the weight-average molecular weight (1.3 < M-w 10(-3) < 40) and the intrinsic viscosity in tetrahydrofuran and chloroform. Theories based on the worm-like touched-bead model were used to treat the molecular-weight dependence of the intrinsic viscosity and to estimate the conformational characteristics (Kuhn statistical segment length l(K), Flory characteristic ratio C-infinity, and steric factor sigma). Low values of these characteristics indicating rather high flexibility of the chain are discussed. (C) 2000 Elsevier Science Ltd. All rights reserved. | ||||||||||
Plný text: | https://www.sciencedirect.com/science/article/pii/S0032386199004747 | ||||||||||
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