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研究了几种纤维素混合醚酯的制备及其高压静电场纺丝性能,分析了溶剂组成、溶液浓度、分子量、酯化基团对成纤性和纤维直径的影响。结果表明:在非均相条件下,经过碱化、醚化与酯化,得到不同结构的纤维素混合醚酯HPMCP、HPMCT与HPMCAS,均可实现静电纺丝;在甲醇/二氯甲烷=1∶4的溶剂体系中易得到表面光滑纤维;在溶剂组成一定条件下,溶液仅在一定浓度范围可纺,且浓度越低、纺丝电压越高,纺丝平均直径越小;当溶剂组成、溶液浓度一定时,分子量对其溶液纺丝的可纺性有直接影响,HPMCAS仅重均分子量达到7.2×104才能获得表面光滑纺丝纤维;在溶剂组成、溶液浓度和分子量一定的条件下,相邻酰基间距离越小,酸性越强,溶液电导率越大,丝越细。
The effects of solvent composition, concentration, molecular weight, esterification groups on fiber formation and fiber diameter were investigated. The results showed that electrospinning of HPMCP, HPMCT and HPMCAS with different structures could be obtained under alkalization, etherification and esterification under heterogeneous conditions. When methanol / dichloromethane = 1 : 4, the surface smooth fibers are easily obtained in the solvent system. Under certain conditions of solvent composition, the solution can be spinnable only in a certain concentration range, and the lower the concentration, the higher the spinning voltage, the smaller the average diameter of the spinning. When the solvent composition, When the concentration of the solution is constant, the molecular weight has a direct influence on the spinnability of the solution spinning solution. The HPMCAS only has a weight average molecular weight of 7.2 × 104 in order to obtain a smooth surface spun fiber. Under the condition of the solvent composition, the solution concentration and the molecular weight, Acyl distance between the smaller, more acidic, the greater the conductivity of the solution, the finer the wire.