Isotope Institute of Henan Academy of Sciences, Zhengzhou 450015, China.
Carbohydr Polym. 2013 Jan 30;92(1):388-93. doi: 10.1016/j.carbpol.2012.10.002. Epub 2012 Oct 8.
Corn starch graft copolymers were prepared from acrylamide/dimethyl diallyl ammonium chloride binary monomers (AM/DMDAAC) by a simultaneous radiation grafting method, and were characterized by FTIR and (1)H NMR techniques, weight measurement and titration method. The copolymers with high grafting ratio and high grafting efficiency of binary monomers were achieved at absorbed doses of 2 kGy and 3 kGy using a 6:9.8:4.2 (w/w/w) ratio of starch/AM/DMDAAC, but their cationic degrees were low. Grafting ratio, grafting efficiency and cationic degree of the copolymers increased with increasing AM content in comonomer mixtures and then decreased at 3kGy using a 6:14 ratio of starch:total comonomers, but their cationic degrees generally decreased with increasing AM content. The grafting ratio, the grafting efficiency and the cationic degree of the copolymers increased, but the grafting efficiency of DMDAAC decreased with varying starch/(AM+DMDAAC) ratio from 6:3 to 6:18 at 3 kGy by using a fixed 7:3 ratio of AM:DMDAAC.
采用丙烯酰胺/二甲基二烯丙基氯化铵二元单体（AM/DMDAAC）的同时辐射接枝法制备了淀粉接枝共聚物，并通过傅里叶变换红外光谱（FTIR）和（1）H 核磁共振（NMR）技术、重量测量和滴定法对其进行了表征。在吸收剂量为 2 kGy 和 3 kGy 下，采用淀粉/AM/DMDAAC 的质量比为 6:9.8:4.2（w/w/w），可以得到接枝率和二元单体接枝效率较高的共聚物，但它们的阳离子度较低。在使用淀粉：总单体的质量比为 6:14 时，在 3 kGy 下，共聚物的接枝率、接枝效率和阳离子度随 AM 含量的增加而增加，然后降低，但阳离子度通常随 AM 含量的增加而降低。在 3 kGy 下，当淀粉/（AM+DMDAAC）的比值从 6:3 变化到 6:18 时，共聚物的接枝率、接枝效率和阳离子度增加，但 AM:DMDAAC 的固定比值为 7:3 时，DMDAAC 的接枝效率降低。
