Introduction We reported that metal ion binds to the side-chain carboxyl group of molecular chain of half-esterified or etherified wood, and that the mobility of modified wood components, in particular, of cellulose mainchains, changes remarkably by the introduction of metal ions (Nakano 1990, 1991). Furthermore, it was clarified that divalent and trivalent metal ions form crosslinks between the main-chains, while monovalent metal ions do not. Factor related to the mobility are the charge (valency), the radius, and the amount of metal ion. The relationship among them is represented by a simple equation (Nakano 1991). If the bonding between metal ion and the side-chain carboxyl group of molecular chain of Carboxymethylated wood is ionic, crosslinking can be broken in water or acid solution because of dissociation of containing metal ions. The interaction between mainchains is then influenced by both nature of metal ion and the degree of ionization. In this work, in order to clarify the effects caused by dissociation of metal ion in water, stress relaxation property of Carboxymethylated wood (CMW) containing various metal ions is examined in water; the measurement is also made by replacing the water with acetic acid 10 minutes after the measurement in water.
Holzforschung - International Journal of the Biology, Chemistry, Physics and Technology of Wood – de Gruyter
Published: Jan 1, 1993
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