稻草芦苇及其浆料制备羧甲基纤维素的比较

研究了直接由草粉或浆料制备羧甲基纤维素钠的溶剂适应性,并对产品的结构、粘度、取代度做了分析。结果表明,丙酮做溶剂时羧甲基纤维素合成的得率最高、取代度最大。草粉和草浆在丙酮溶剂中经过一次反应得到的羧甲基纤维素取代度均可达0.7以上。红外光谱表明,从草粉和从浆料制得的羧甲基纤维素样品结构上没有明显差别。以不同程度预处理的草粉为原料,可以得到取代度0.5~1.1之间的不同品质的羧甲基纤维素产品。

Synthesis and Characterization of Carboxymethylated Cellulose from Rice Straw and Reed

The synthesis and characterization of carboxymethylated cellulose from rice straw and reed was focused on. Carboxymethylated was synthesized directly from straw mills or straw pulps, the yields, viscosity, degree of substitution （DS）, and FT- IR absorptions were compared, respectively. Results showed that either straw mills or straw pulps were available for using as raw materials. Acetone showed the best accessibility in the reaction process, the yields, DS, viscosity of the products which were got from acetone had the best characteristics. The DS can reach O. 7 both for straw mills and straw pulps starting materials. There was no significant difference on FT- IR measured structure between carboxymethylated celluloses from mills or pulps. In addition, changing the pretreatment degree of raw materials, the DS of products can be changed from 0.5 to 1.1 according to necessary.