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  • Title: Composite structure of temperature sensitive chitosan microgel and anomalous behavior in alcohol solutions.
    Author: Liu W, Huang Y, Liu H, Hu Y.
    Journal: J Colloid Interface Sci; 2007 Sep 01; 313(1):117-21. PubMed ID: 17512941.
    Abstract:
    Poly(N-isopropylacrylamide)/chitosan (PNIPAM/CS) core-shell microgel was synthesized by graft copolymerization. The microstructure of copolymers was characterized by FT-IR spectrum and (1)H-nuclear magnetic resonance ((1)H NMR). Transmission electron microscope (TEM) and dynamic light scattering (DLS) measurements display that the microgel has high monodispersity and with a core-shell structure. For swelling the microgel in various alcohol solutions, the particles first shrink; then flocculation occurs resulted from weak aggregation of particles with the increase of alcohol concentration. The investigation of the size of microgels as a function of temperature shows that the thermo-sensitive property is markedly exhibited when the alcohol concentration is low, and vanishes when the alcohol concentration exceeds some value where the microgels have the lowest size.
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