Radiation-induced crosslinking of polysaccharide derivatives; The Control of the gelation by changing irradiation temperature-p

Nagasawa, Naotsugu; Yagi, Toshiaki; Tamada, Masao; Pham, T. L. H.*

Recently, we have reported the synthesis of hydrogels of polysaccharide derivatives such as carboxymethylcellulose (CMC), carboxymethylchitin, etc., by radiation-induced crosslinking methods. Control of gelation of polysaccharide derivatives by radiation is very important factor for various applications. It was investigated that control temperature during irradiation affects on crosslinking behavior of CMC. The gel fraction and swelling of CMC gel after irradiation at temperature of -78 to 70 C were determined. The more pronounced gelation was occurred in lower temperature region of -78 to 0 C when compared to the other region of 0 to 70 C. It found that gelation could be controlled by changing temperature at the time of the irradiation when it was made to put a polysaccharide derivative such as CMCT and CMS on the crosslinking with the radiation and gel was formed.