6. A simple test method for the ash content of cellulose ether: weigh one to two grams of cellulose ether, ignite it with a lighter, weigh the ash residue left by the combustion of cellulose ether, and when the ash residue / cellulose ether is ≥ 5%, the quality of cellulose ether is basically unqualified. (there are sometimes errors in this method. First, the manufacturer compounded the products suitable for specific customers for customers before leaving the factory; second, the agents or manufacturers added flammable substances with low ash content when adulterating)

The general chemical structure of MHEC is presented in Fig. 2. According to supplier information, the sample employed in the study exhibited a degree of substitution relative to methylation (DS value) of 1.81, and a molar degree of substitution relative to hydroxyethylation (MS) of 0.15. Gel permeation chromatography (GPC) analysis produced molar masses of 2.48·10⁵ g/mol (M_w) and of 1.74·10⁵ g/mol (M_n), respectively (Table 2). Using the GPC method, a hydrodynamic radius R_h(z) of 31.0 nm and a

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