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Accessibility of cellulose

Paper Chemistry, p.9-24

Blackie & Son Ltd 1991 ;ISBN: 9401164762 ;ISBN: 9789401164764 ;EISBN: 9789401164740 ;EISBN: 9401164746 ;DOI: 10.1007/978-94-011-6474-0_2

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  • Title:
    Accessibility of cellulose
  • Author: Roberts, G. A. F.
  • Subjects: Cotton Fibre ; Crystalline Region ; Crystallinity Index ; Paper Chemistry ; Wood Pulp
  • Is Part Of: Paper Chemistry, p.9-24
  • Description: Cellulose, in common with many other polymers, has a two-phase morphology containing both crystalline and non-crystalline (amorphous) material. The model most frequently used is the fringed micelle structure [1] in which individual chains pass through several crystalline and non-crystalline regions (Figure 2.1). Although this model is in agreement with many of the properties of cellulose [2] other models have been proposed, in many instances based on the observed properties of the microfibrils. These include the fringed-fibril structure [3] and paracrystalline structures [4–11] in which the noncrystalline component arises from dislocations and chain-ends within the highly crystalline fibrils [12] making up the microfibril (Figure 2.2). Krässig [13] has proposed a further model in which the elementary crystalline fibril is surrounded by one layer of amorphous (‘disturbed’) chains, whilst the layer of chains immediately within this amorphous layer is accessible to reagents such as water or deuterium oxide. Despite the occurrence of chain folding in cellulose single crystals [14] most of the available evidence is against such an arrangement in native cellulose [15–19].
  • Publisher: Dordrecht: Springer Netherlands
  • Language: English
  • Identifier: ISBN: 9401164762
    ISBN: 9789401164764
    EISBN: 9789401164740
    EISBN: 9401164746
    DOI: 10.1007/978-94-011-6474-0_2
  • Source: Alma/SFX Local Collection

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