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With potassium hydroxide (KOH) as catalyst, hydroxypropyl guar gum (HPG) was successfully prepared under homogenous conditions in an ionic liquid 1-butyl-3-methylimidazolium chloride (BmimCl). The value of degree of molar substitution (MS) of HPG, which was determined by means of 1 H NMR, was easily controlled by varying the mass ratio of propylene oxide (PO) to guar gum (GG). The distribution...
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