研究了醋酸羟丙基甲基纤维素琥珀酸酯(HPMCAS)溶液高压静电场纺丝过程中高聚物分子量、溶液浓度、静电场强度对成纤性和纤维直径的影响,制备出直径范围为0.43μm～1.0μm的纤维.当溶剂、溶液浓度及静电场强度一定时,重均分子量M_W分别为2.6万、4.8万和7.2万,HPMCAS溶液中只有7.2万者能纺丝得到光滑纤维.在静电场强度、溶剂组成一定条件下,HPMCAS可纺丝浓度范围为8%～15%(质量分数,下同),且随着纺丝溶液浓度的增大,所得纤维的平均直径逐渐增大.当其它条件保持一定时,随着纺丝电压的增大,所得纤维的平均直径呈下降的趋势,所得纤维结晶度略微增大.
The effect of weight-average molecular weight, solution concentration and electrostatic field strength on the formation and diameter of the fibers were investigated in the process of electrospinning of hydroxypropyl methylcellulose acetate succinate(HPMCAS) solutions, the average diameter of as-spun fibers ranged between 0.43 μm and 1.0μm. The results show that for fixed solvent, concentration and electrostatic field strength, the HPMCAS molecular weight that supports normal cylindrical fiber generation is 72 000. For fixed solvent and electrostatic field strength, the concentration range suitable for electrospinning is from 8% to 15 %, the average fiber diameter increases with increasing concentration. For fixed solvent and concentration, average fiber diameter decreases with increasing electrostatic field strength, in contrast the crystallinity of the fiber increases with increasing electrostatic field voltage.
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