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An elemental chlorine-free (ECF)-bleached soft-wood kraft pulp was treated first with a carboxymethyl cellulose (CMC, degree of substitution 0.3, 1% on pulp) and then with alkyltrimethylammonium bromides (alkyl chain lengths of C10 to C16). Surprisingly, the treatment with dodecyltrimethylammonium bromide (C12TAB) markedly increased the internal and tensile strengths of the handsheets prepared from...
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