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利用热孔计法(Thermoporometry)和压汞法研究湿法纺丝过程中初生纤维孔结构的变化规律。讨论牵伸倍数和牵伸温度对初生纤维孔结构的影响。结果表明,一浴纤维和二浴纤维以介孔和大孔为主且多为开孔,热牵纤维以介孔为主且部分孔发生闭合;初生纤维的孔径和孔隙率随着纺丝过程进行逐渐变小,孔分布也逐渐变窄;孔径和孔隙率随着牵伸倍数的增加而减小,提高温度有利于加速这一过程。就分析方法而言,压汞法可以避免热孔计法在分析大孔方面的不足,比较适合分析一浴纤维和二浴纤维的孔结构;而热孔计法可以避免压汞法不能分析开孔的弊端,因此更适合分析热牵纤维的孔结构。
The pore structure of primary fibers during wet spinning was investigated by Thermoporometry and mercury intrusion porosimetry. The effects of draw ratio and draw temperature on the pore structure of primary fibers were discussed. The results show that one-bath fibers and two-bath fibers are mostly mesopores and macropores and are mostly open cells. The mesopores of the hot-drawn fibers are predominant and some of the pores are closed. The pore size and porosity of nascent fibers vary with the spinning process The pore size and pore size decrease gradually with the increase of draw ratio. Increasing the temperature will accelerate the process. In terms of analytical methods, mercury intrusion method can avoid the shortcomings of the hot hole method in the analysis of large holes, more suitable for analysis of the bath structure of a bath fiber and two bath fiber; Hole defects, it is more suitable for analysis of the fiber structure of the hot pull fiber.