NDLI: Mechanism of structure formation and dissolution of regenerated cellulose from cellulose/aqueous sodium hydroxide solution and formation of molecular sheets deduced from the mechanism

Content Provider	Springer Nature Link
Author	Yamane, Chihiro Hirase, Ryuji Miyamoto, Hitomi Kuwamoto, Shigeo Yuguchi, Yoshiaki
Copyright Year	2015
Abstract	The structure formation of regenerated cellulose from aqueous sodium hydroxide solution was investigated using synchrotron X-ray radiation. The diffraction shoulder, which was possibly assigned to the molecular sheet structure, was observed in the wide angle scattering region during the gelation process of the solution. Molecular sheets were progressively piled to more than three layers at the final stage of gelation, as deduced from small angle X-ray scattering. These results suggested that the molecular sheet was formed at the initial stage of structure formation. The model of the molecular sheet structure is reasonably stable in aqueous media because of its hydrophilic exterior and hydrophobic interior. The dissolution of cellulose in aqueous sodium hydroxide solution was also investigated and the molecular sheet was found to remain in the dissolving system until the last stage of dissolving. These results, namely, the molecular sheet firstly appeared from the cellulose solution in the coagulating process and finally disappeared in the dissolving process, indicates that structure formation and dissolution are “two sides of the same coin”. The X-ray diffraction peak, which could not be assigned to any crystalline diffraction, was observed for the regenerated cellulose films prepared from aqueous sodium hydroxide solution. The scattering vector q of the diffraction was 14 nm−1, which was equivalent to the spacing between cellulose chains in the molecular sheet, 0.45 nm. The trace of the molecular sheet possibly exists in the regenerated cellulose.
Starting Page	2971
Ending Page	2982
Page Count	12
File Format	PDF
ISSN	09690239
Journal	Cellulose
Volume Number	22
Issue Number	5
e-ISSN	1572882X
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-07-25
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Structure formation Cellulose Regenerated cellulose Synchrotron X-ray Molecular sheet Regeneration Bioorganic Chemistry Physical Chemistry Organic Chemistry Polymer Sciences
Content Type	Text
Resource Type	Article
Subject	Polymers and Plastics

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