Synthesis and properties of chitosan-modified poly(vinyl butyrate) |
| |
Authors: | Sibel Akgün Gülsüm Ekici Nilüfer Mutlu Necati Be?irli Baki Hazer |
| |
Affiliation: | (1) Department of Chemistry, Bursa Uludag University, 16059 Bursa, Turkey;(2) Department of Chemistry, Zonguldak Karaelmas University, 67100 Zonguldak, Turkey |
| |
Abstract: | Modification of chitosan by grafting of vinyl butyrate was carried out in homogeneous phase using potassium persulfate as
redox initator and 1.5% acetic acid as solvent. The percent grafting and grafting efficiency were analysed and the high grafting
efficiency up to 94% was observed. The effects of reaction variables such as monomer concentration, initiator concentration,
temperature and reaction time were investigated. It was observed that the solubility of chitosan was markedly reduced after
grafting with vinyl butyrate. The grafted product is insoluble in common organic solvents as well in dilute organic and inorganic
acids. Characterization of the graft copolymers were carried out by using Fourier Transform Infrared Spectroscopy (FTIR),
Differential Scanning Calorimetry (DSC) and Scanning Electron Microscopy (SEM) technics. Characteristic signal of carbonyl
group was observed at 1,731 cm−1 which belongs to the poly vinyl butyrate segments in the graft copolymer. The melting transition of the chitosan main chain
in the copolymer shifted to 124°C from its original value 101°C. In addition to these, we have also studied topology of the
graft copolymer and the SEM micrograph showed continuous homogenous matrix which means there is no phase separation. |
| |
Keywords: | chitosan graft copolymer vinyl butyrate |
本文献已被 SpringerLink 等数据库收录! |
|