カルボキシメチルセルロ-ス繊維より成る紙質における湿潤強度の発現
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概要
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The present study was carried out to obtain a fundamental information about the generation of wet strength based on the natural aging and the heat treatment of paper sheet made of fibrous carboxymethyl cellulose (CMC). Amounts of ester or lactone linkage formed by the heat treatment in CMC fibers with various degrees of substitution (DS) were determined by the indirect iodometry, and the relationship between the chemical changes and the mechanical properties of CMC paper was investigated. The results are as follows : <BR>(1) By examining the hydroxylamine-ferric chloride test, the cleavage reaction of ester linkages by a KI-KIO<SUB>3</SUB> solution and the reduction treatment with NaBH<SUB>4</SUB>, it was confirmed that a small part of free carboxyl groups in CMC samples was consumed to form ester and lactone linkages in the processes of the natural aging and the heat treatment. <BR>(2) The amount of ester linkage formed in CMC differed with the DS of the samples and rose with the increasing DS. However, the estimated change was less than about 10% of the total carboxyl group in CMC, indicating not a large part of the carboxyl group to participate to the chemical change. <BR>(3) It was believed that the inteamolecular, intermolecular and interfiber dehydrations in CMC samples by the natural aging and the heat treatment lead to the formation of ester or lactone linkage, which constructs the cross-linked structure, resulting directly in the generation of wet strength and the lowering of alkali solubility of CMC paper.
- 紙パルプ技術協会の論文
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