섬유

effect of refining with sodium hydroxide-urea solution on the acetylation behaviour of cellulosic fibres

  • 출판일1999.03
  • 저자
  • 서지사항
  • 등록일 2016.11.02
  • 조회수 266
the presence of urea during cold and hot alkali refining of bagasse kraft pulp and cotton linters improves their properties. the physical and submicroscopic characteristics of linters are mainly affected. the presence of urea increases the degradation and solubility of the more hydrophilic short-chain carbohydrates and results in better homogenization of the pulp. hot refining in the presence of urea results in decrystallization of the long-chain cellulose macromolecules and thus increases the accessibility and reactivity of the pulp towards xanthation. the presence of urea improves the reactivity towards acetylation and results in acetate with better thermal stability. also, the better degree of homogenization of the pulp decreases the probability of the filter clogging during filtration and is reflected in better chemical and physical characteristics of the acetate. (author abstract) 8 refs
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