The paper introduces the present research carboxymethyl starch synthesis principle and method, and the substitution degree of carboxymethyl starch test methods were introduced in detail.
本文介绍了羧甲基淀粉的研究现状，合成原理和方法，并对羧甲基淀粉取代度测试的方法进行了详细的介绍。
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The application test of guar gum as a new strengthening agent in cultural paper was carried out in laboratory scale. Its strengthening effect was compared with that of cationic starch.