Thermo-sensitive gels copolymers

The second example used visible light absorption that increased the temperature locally within the thermosensitive gel [39]. The gel consisted of a covalently cross-linked copolymer network of N-isopropylacrylamide and chloro-phyllin, a combination of a thermo-sensitive gel and a chromophore. In the absence of light, the gel volume changed sharply but continuously as the temperature was varied. Upon illumination the transition temperature was lowered, and beyond a certain irradiation threshold the volume transition became discontinuous. The phase transition was presumably induced by local heating of polymer chains due to the absorption and subsequent thermal dissipation of light energy by the chromophore. The details will be discussed in a later section. 

Thermo-Sensitive Gels Biodegradable Hydrogels from Enantiomeric Copolymers of Poly(lactide) and Poly(ethylene glycol)... 

Yoshida, R., Sakai, K., Okano, T., and Sakurai, Y. Modulating the phase transition temperature and thermo-sensitivity in iV-isopropylacrylamide copolymer gels, J. Biomater. Set Polymer Ed., 1994, 6, 585-598. 

Thermo-sensitive micro- or nano-gel particles can be obtained if the block copolymer formation is carried out in the presence of MBAm as a cross-linker. 

Y. Kaneko, R. Yoshida, K. Sakai, Y. Sakurai and T. Okano, Temperature-responsive shrinking kinetics of poly(Y-isopropylacrylamide) copolymer gels with hydrophilic and hydrophobic comonomers, J. Membr. Sci., 1995, 101, 13 Y.H. Lim, D. Kim and D.S. Lee, Drug releasing characteristics of thermo- and pH-sensitive interpenetrating polymer networks based on poly(W-isopropylacrylamide), J. Appl. Polym. Sci., 1997,... 

Woodcock, J., Wright, R., Jiang, X., O Lenick, T., Zhao, B. Dually responsive aqueous gels from thermo- and light-sensitive hydrophilic ABA triblock copolymers. Soft Matter 6(14), 3325 (2010)... 

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