Polydimethylsiloxane-modified chitosan I. Synthesis and structural characterisation of graft and crosslinked copolymers |
| |
Authors: | Daniela Enescu Viorica Hamciuc Lucia Pricop Thierry Hamaide Valeria Harabagiu Bogdan C Simionescu |
| |
Affiliation: | (1) Departament of Macromolecules, “Gh. Asachi” Technical University, 700050 Iasi, Romania;(2) “Petru Poni” Institute of Macromolecular Chemistry, 700487 Iasi, Romania;(3) Ecole Supérieure de Chimie Physique Electronique de Lyon, BP 2077, 43, Boulevard du 11 Novembre 1918, 69616 Villeurbanne cedex, France |
| |
Abstract: | Graft and crosslinked polydimethylsiloxane (PDMS)-chitosan copolymers were prepared through the reaction between mono and
difunctional glycidoxypropyl-terminated PDMSs and chitosan. The transformation of amino groups of chitosan through the reaction
with epoxy groups was confirmed by FT-IR and 13C cross-polarization (CP) magic-angle spinning (MAS)-NMR analysis. Chitosan-based materials modified with about 40% and 60%
hydrophobic polydimethylsiloxane were obtained, respectively. As proved by wide angle X-ray analysis, the crystallinity of
chitosan was strongly decreased through the incorporation of PDMS sequences. However, both graft and crosslinked copolymers
still present a partial crystalline structure. Their X-ray patterns are not only different as compared to chitosan but also
as compared to each other. For the graft copolymer, three diffraction peaks were observed at 2θ = 8.4°, 11.2° and 21.2°, indicating the formation of a new partially crystalline phase and the modification of the interplanar
distances for the phases similar to chitosan. The crosslinked copolymer is even less crystalline, the peak around 2θ = 20° being strongly decreased. Different thermal behaviour of siloxane modified chitosan was registered for graft and crosslinked
copolymers; the graft sample is less stable than chitosan, while the crosslinked copolymer showed an intermediate stability
between chitosan and polydimethylsiloxane precursors. |
| |
Keywords: | Chitosan Polydimethylsiloxane Chemical modification |
本文献已被 SpringerLink 等数据库收录! |
|