Cyclodextrin-grafted cellulose: Physico-chemical characterization
Journal article, 2013
Cyclodextrins (CDs) can form inclusion complexes with a wide variety of molecules making them very attractive in different areas, such as pharmaceutics, biochemistry, food chemistry and textile. In this communication we will report on the physico-chemical characterization of cellulose modified with CDs by means of infra-red spectroscopy (FTIR), cross polarization magic angle spinning solid state nuclear magnetic resonance (CP-MAS NMR), polarized optical microscopy (POM) and thermal gravimetric analysis (TGA). Both CP-MAS NMR and FTIR indicate that CDs are chemically attached to cellulose backbone through the formation of ester bonds. Furthermore, the CD-grafted cellulose was dissolved in a "superphosphoric" acid solution but, despite the increase of hydrophilicity due to the modification, POM revealed that grafted cellulose was less soluble when compared to the unmodified polymer. The formation of a complex CD-cellulose network is suggested.
FTIR
Cellulose
Dissolution
Cyclodextrin
Polycarboxylic acid
Author
B. Medronho
Universidade do Algarve
Universidade de Coimbra, Faculdade de Ciencias e Tecnologia
R. Andrade
Universidade de Coimbra, Faculdade de Ciencias e Tecnologia
V. Vivod
Univerza v Mariboru
Åsa Östlund
Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry
M. G. Miguel
Universidade de Coimbra, Faculdade de Ciencias e Tecnologia
B. Lindman
Lunds Universitet
Universidade de Coimbra, Faculdade de Ciencias e Tecnologia
B. Voncina
Univerza v Mariboru
A. J. M. Valente
Universidade de Coimbra, Faculdade de Ciencias e Tecnologia
Carbohydrate Polymers
0144-8617 (ISSN)
Vol. 93 1 324-330Subject Categories (SSIF 2011)
Organic Chemistry
DOI
10.1016/j.carbpol.2012.08.109