Dependence of Relaxation Property of Succinylated Wood on Side-Chain lonization

Dependence of Relaxation Property of Succinylated Wood on Side-Chain lonization Introduction It is well-known that the conformation of polyelectrolyte depends remarkably on the degree of ionization (Peller 1959; Wada 1960; Strauss etal. 1954; Schneider et al. 1954; Harris et al. 1954). The structure is transformed from random coil to rodlike conformation with an increase in the degree of ionization. The change of conformation is related to electrostatic repulsion of side chain. In a previous report (Nakano 1993), we assumed that one of the factors related to the decrease of relaxation rigidity Gr with an increase in the amount of side chains of carboxymethylated wood is the electrostatic repulsion of ionized side chain; the interaction between the main chains decreases because of expanded space among wood components. Thus, in analogy with polyelectrolyte, we can predict that relaxation properties of chemically-modified wood with a dissociative group such as the carboxyl group in side chain depend upon the degree of ionization. In the present report, we will try to clarify the relationship between the degree of ionization of side chain and the mobility of wood components. We examine the effect of pH and the content of salt on relaxation properties in aqueous solution for Succinylated wood (SW) with carboxyl group in http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Holzforschung - International Journal of the Biology, Chemistry, Physics and Technology of Wood de Gruyter

Dependence of Relaxation Property of Succinylated Wood on Side-Chain lonization

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Publisher
de Gruyter
Copyright
Copyright © 2009 Walter de Gruyter
ISSN
0018-3830
eISSN
1437-434X
DOI
10.1515/hfsg.1993.47.4.278
Publisher site
See Article on Publisher Site

Abstract

Introduction It is well-known that the conformation of polyelectrolyte depends remarkably on the degree of ionization (Peller 1959; Wada 1960; Strauss etal. 1954; Schneider et al. 1954; Harris et al. 1954). The structure is transformed from random coil to rodlike conformation with an increase in the degree of ionization. The change of conformation is related to electrostatic repulsion of side chain. In a previous report (Nakano 1993), we assumed that one of the factors related to the decrease of relaxation rigidity Gr with an increase in the amount of side chains of carboxymethylated wood is the electrostatic repulsion of ionized side chain; the interaction between the main chains decreases because of expanded space among wood components. Thus, in analogy with polyelectrolyte, we can predict that relaxation properties of chemically-modified wood with a dissociative group such as the carboxyl group in side chain depend upon the degree of ionization. In the present report, we will try to clarify the relationship between the degree of ionization of side chain and the mobility of wood components. We examine the effect of pH and the content of salt on relaxation properties in aqueous solution for Succinylated wood (SW) with carboxyl group in

Journal

Holzforschung - International Journal of the Biology, Chemistry, Physics and Technology of Woodde Gruyter

Published: Jan 1, 1993

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