60Co-γ共辐射阳离子接枝淀粉的制备

Preparation of cation grafted starch by ^(60)Co-γ irradiation

采用辐射的方法对天然淀粉进行接枝改性,将一定量的绝干玉米淀粉与DMC的水溶液均匀混合,在60Co-γ辐射场中辐射后,经烘干、粉碎、离心萃取制备阳离子接枝淀粉。研究反应介质、预聚物配比、辐射剂量及辐射剂量率对样品制备的影响,并分析产生这些影响的原因,得出制备此种阳离子接枝淀粉的最佳工艺参数:反应介质(水)配比0.28、预聚物配比0.06、辐射剂量6 kGy、辐射剂量率10 Gy/min。

The grafting modification of natural starch was carried out by the use of 60 Co-γ irradiation. Cation grafted starch was prepared by three steps： first mix a certain amount of corn starch with DMC＇s aqueous solution uniformly, then the resultant product is radiated in the 60 Co-γ radiation field, finally＇it is subjected to drying, crushing, and centrifugal extraction. The effects of reaction medium, monomer ratio, radiation dose and dose rate on the sample were investigated, and the affecting factors were analyzed. The best technical parameters of grafting cations onto the starch were determined： ratio of reaction medium（water）, 0.28; monomer ratio, 0.06; radiation dose, 6 kGy; and radiation dose rate, 10 Gy/min .