NDLI: Superhydrophobic foam-like cellulose made of hydrophobized cellulose fibres

Content Provider	Springer Nature Link
Author	Tejado, Alvaro Chen, Wei Chung Alam, Md Nur Ven, Theo G. M.
Copyright Year	2014
Abstract	Wood (kraft) pulp was first dried into a low-density foam-like material by solvent-exchange with anhydrous ethanol. X-Ray tomography showed that, while pulp fibres are flat and resemble ribbons when dried from water, those dried from ethanol are quasi-tubular, inferring that capillary forces derived from a low surface tension solvent are not strong enough to promote fibre lumen collapse, contrary to what happens in water. When the resulting foam-like pulp was then subjected to a vapour phase reaction with trichloromethylsilane (TCMS) a silicon based polymeric coating was created on the surface of the fibres, and the totality of the hydroxyl groups (–OH) on the external surface of cellulose fibres and the internal surface of micropores in the fibre wall became silylated, whereas the surface of the nanopores was inaccessible to TCMS. The novelty lies in the ability to modify both the external surface and the internal micropore structure of cellulose fibres from 50 to 100 % silane coverage, which results in a novel superhydrophobic material, with a contact angle of approximately 150°. This is the first time cellulose is hydrophobized both internally and externally. We refer to the resulting foam as Cellufoam.
Starting Page	1735
Ending Page	1743
Page Count	9
File Format	PDF
ISSN	09690239
Journal	Cellulose
Volume Number	21
Issue Number	3
e-ISSN	1572882X
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-03-22
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cellulose foam Superhydrophobic Vapour deposition Trichloromethylsilane (TCMS) Surface polymerization Bioorganic Chemistry Physical Chemistry Organic Chemistry Polymer Sciences
Content Type	Text
Resource Type	Article
Subject	Polymers and Plastics

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