本发明的方法包括以下步骤：在溶剂中溶解聚合度为500-1600的纤维素形成溶液；
The method of the invention comprises the following steps: cellulose with the degree of polymerization of 500 to 1600 is dissolved in a solvent to form a solution;
本发明的方法包括以下步骤：在溶剂中溶解聚合度为500-1600的纤维素形成溶液；
The method of the invention comprises the following steps: cellulose with the degree of polymerization of 500 to 1600 is dissolved in a solvent to form a solution;
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