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| Content Provider | Springer Nature Link |
|---|---|
| Author | Khan, Abbas Akil, Hazizan Md Othman, Muhammad Bisyrul H. Chang, Boon Peng |
| Copyright Year | 2015 |
| Abstract | This study describes the synthesis, characterization and detailed physicochemical investigation on the stimuli-responsive behaviour of chitosan-poly (N-isopropylacrylamide) [chitosan-PNIPAM] copolymer microgels. Six different compositions of dual-responsive chitosan-PNIPAM based microgels were synthesized by soapless-emulsion free radical copolymerization method in an aqueous medium at 70 °C. The chemical composition, swelling/de-swelling, volume phase transitions, electrical properties, colloidal stability, and physicochemical behaviour under various pH/temperature conditions were investigated using Fourier transform infrared spectroscopy (FTIR), dynamic light scattering (DLS), zeta-potential, and rheology. Various functional groups present in the copolymer microgels were confirmed by FTIR analysis. The hydrodynamic diameter (D $_{h}$), volume phase transition temperature (VPTT), and swelling/de-swelling behaviour of microgels, under different pH and temperature conditions, in aqueous media were investigated using DLS measurements. Zeta potential measurements were used to evaluate the stability, electrical and electro-kinetic properties of the gels at various pH/temperatures. Likewise, the influence of temperature and chemical composition of microgels on the particle behaviour was investigated through rheological studies. A transition from sol-to-gel state at temperature beyond 50 °C was also noticed in all hydrogel samples. On the basis of results obtained, we observed that variables such as NIPAM/chitosan ratio, amount of cross-linker, and temperature/pH not only affect the above mentioned properties but also affect the dual-sensitivity and stability of the microgels. Most of the chitosan-PNIPAM particles remained soluble and maintained good stability without significant sedimentation in water through a wide range of pH (pH ≈ 2–8) for about 3 months at room temperature. |
| Starting Page | 317 |
| Ending Page | 328 |
| Page Count | 12 |
| File Format | |
| ISSN | 10261265 |
| Journal | Iranian Polymer Journal |
| Volume Number | 24 |
| Issue Number | 4 |
| e-ISSN | 17355265 |
| Language | English |
| Publisher | Springer Berlin Heidelberg |
| Publisher Date | 2015-03-10 |
| Publisher Place | Berlin, Heidelberg |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Polymer Sciences Colloidal stability Light scattering Stimuli-responsive polymers Ceramics, Glass, Composites, Natural Methods Phase changes Physicochemical properties |
| Content Type | Text |
| Resource Type | Article |
| Subject | Materials Chemistry Chemical Engineering Polymers and Plastics |
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