A novel method of controlled grafting modification of chitosan via RAFT polymerization using chitosan-RAFT agent

The controlled grafting modification of chitosan has first been achieved by RAFT polymerization using chitosan-RAFT agent. The chitosan was first modified with S-1-dodecyl- S′-(α,α′-dimethyl-α′′-acetic acid)trithiocarbonate (DDACT) to serve as RAFT agent, and then the controlled grafting polymerizat...

Full description

Saved in:
Bibliographic Details
Published in:Carbohydrate polymers 2008-07, Vol.73 (1), p.98-104
Main Authors: Hua, Daoben, Tang, Jing, Cheng, Jianxin, Deng, Weicai, Zhu, Xiulin
Format: Article
Language:English
Subjects:
Applied sciences
Chitosan
composite polymers
Controlled modification
Exact sciences and technology
graft polymerization
Natural polymers
new methods
Physicochemistry of polymers
polymerization
RAFT polymerization
reversible addition-fragmentation chain transfer
Starch and polysaccharides
synthesis
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The controlled grafting modification of chitosan has first been achieved by RAFT polymerization using chitosan-RAFT agent. The chitosan was first modified with S-1-dodecyl- S′-(α,α′-dimethyl-α′′-acetic acid)trithiocarbonate (DDACT) to serve as RAFT agent, and then the controlled grafting polymerization of acrylic acid were performed. The resultant copolymers were characterized by 1H nuclear magnetic resonance ( 1H NMR), Fourier transform infrared spectrometer (FT-IR), X-ray powder diffractometer (XRD), high performance particle sizer (HPPS), and transmission electron microscopy (TEM). The results indicate that the graft copolymers were successfully synthesized and that the grafting polymerization was a first-order reaction with respect to monomer concentration. The size distribution of chitosan -g-PAA in ethanol is very narrow, which may be associated with the grafting density and the “well-defined” PAAs onto chitosan from RAFT polymerization. TEM shows chitosan -g-PAA in dilute ethanol dispersions is roughly 80 nm in size with some aggregation. This work provides a new method to prepare chitosan grafting copolymers with controlled molecular weights and “well-defined” structures.
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2007.11.008