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首页> 外文期刊>Journal of Applied Polymer Science >Compositional Changes During the Wet Spinning of Acrylic Fibers from Aqueous Sodium Thiocyanate Solvent
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Compositional Changes During the Wet Spinning of Acrylic Fibers from Aqueous Sodium Thiocyanate Solvent

机译：硫氰酸钠水溶液丙烯酸纤维湿纺过程中的成分变化

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摘要

The compositional changes taking place during the wet spinning of acrylic fibers from an aqueous sodium thiocyanate solvent were investigated.The composition of the fibers diverted from the precipitation bath after various immersion times was determined gravimetrically,while fiber diameters were imaged to ascertain volumetric changes with time.The kinetics of phase separation were approximated using light transmission and video techniques applied to acrylic films.For coagulation into water at 20 and 40 deg C and into 15% aqueoun NaSCN at 20 deg C,a greater influx of the nonsolvent to outflow of the solvent was recorded at short timescales. Unexpectedly,both the outflow of the solvent and nonsolvent against the concentration gradient was noted at longer timescales,suggested by the light transmission data to be after the primary phase separation.The consequent reduction in filament diameter,hence,the volume,is discussed in terms of a coarsening mechanism,whereby the mobile polymer lean phase has a route away from the filament into the bath during polymer coarsening.Finally,the compositional changes are plotted on a phase diagram for the system as trajectories into teh two-phase region.The polymer-coarsening effect renders the interpretation al longer timescales uncertain.
机译：研究了从硫氰酸钠水溶液湿纺丙烯酸纤维的过程中发生的成分变化。用重量分析法测定了在各种浸没时间后从沉淀浴中转移出来的纤维的组成，同时对纤维直径进行成像以确认体积随时间的变化。相分离的动力学是通过将光传输和视频技术应用于丙烯酸薄膜来估算的。为了在20和40摄氏度下凝结成水并在20摄氏度下凝结成15％的NaSCN水溶液，大量的非溶剂涌入在短时间内记录溶剂。出乎意料的是，在较长的时间范围内，溶剂和非溶剂都出现了针对浓度梯度的流出，这是由透光数据表明是在初相分离之后提出的。因此讨论了细丝直径，因此，体积的减小最后，在系统的相图上绘制了组成变化的相变图，作为进入两相区域的轨迹。粗化效果使解释的时间尺度更长。

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