Thermoresponsive sodium alginate-g-poly(N-isopropylacrylamide) copolymers III. Solution properties

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[1] Cheaburu, Catalina Natalia
[2] Ciocoiu, Oana-Nicoleta
[3] 2,Staikos, Georgios
[4] Vasile, Cornelia
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Staikos, G. (staikos@chemeng.upatras.gr) | 1600年 / John Wiley and Sons Inc卷 / 127期
关键词：
Stimuli-responsive biocompatible and biodegradable materials can be obtained by combining polysaccharides with polymers exhibiting lower critical solution temperature (LCST) phase behavior; such as poly(N-isopropylacrylamide) (PNIPAAm). The behavior of aqueous solutions of sodium alginate (NaAl) grafted with PNIPAAm (NaAl-g-PNIPAAm) copolymers as a function of composition and temperature is presented. The products obtained exhibit a remarkable thermothickening behavior in aqueous solutions if the degree of grafting; the concentration; and the temperature are higher than some critical values. The sol-gel-phase transition temperatures have been determined. It was found that at temperatures below LCST the systems behave like a solution; whereas at temperatures above LCST; the solutions behave like a stiff gel; because of PNIPAAm segregation. This behavior is reversible and could find applications in tissue engineering and drug delivery systems. Copyright © 2012 Wiley Periodicals; Inc;
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