NDLI: Low degree of substitution cellulosic textile coatings with improved physiological parameters

Content Provider	Springer Nature Link
Author	Braun, M. A. Effenberger, F. Hermanutz, F.
Copyright Year	2013
Abstract	To further improve the physiological properties of textiles, solutions of low degree of substitution cellulose derivatives, i.e. carbamates and acetates, containing finely dispersed sub-micron scaled NaCl particles (d16 = 269 nm, d50 = 275 nm, d84 = 283 nm) serving as templates were coated on textiles. By wet milling of NaCl particles in a 12.5 wt% solution of polyvinylpyrrolidone in dimethylacetamide (DMAc) as dispersing agent, a stable, processable dispersion was obtained, which could be diluted with LiCl/DMAc without any flocculation. For the preparation of the coating solution, the NaCl/DMAc dispersions were diluted with LiCl/DMAc and added to the DMAc-swollen cellulose derivatives. After application onto the textiles, the NaCl particle-containing coating had to be coagulated directly after application in a solvent bath, otherwise slow replacement of hygroscopic DMAc by water lead to the dissolution and recrystallisation of NaCl on the surface of the coating, thereby changing particle distribution and diameter. The solvent for the coagulation bath was chosen in a way that it allows for a high coagulation speed for the cellulose derivative matrix while possessing a low solubility product for NaCl (e.g., 2-propanol) in order to prevent any loss of the NaCl particles. Due to the highly porous structure created, increased water retention values and increased water vapour permeabilities were observed under preservation of the number of accessible hydroxyl groups of the cellulose derivatives. Both the templated and non-templated coatings could be processed on various textile substrates (e.g., on PET and PP). An important feature of these new materials, i.e. the possibility to apply an antibacterial finish, is discussed within the context of a potential use in the medical sector.
Starting Page	803
Ending Page	812
Page Count	10
File Format	PDF
ISSN	09690239
Journal	Cellulose
Volume Number	21
Issue Number	1
e-ISSN	1572882X
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-10-25
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Substituted cellulose Textile coating Porous matrix Bioorganic Chemistry Physical Chemistry Organic Chemistry Polymer Sciences
Content Type	Text
Resource Type	Article
Subject	Polymers and Plastics

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