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首页> 外文期刊>Journal of Applied Polymer Science >PVA/PAA thermo-induced hydrogel fiber: Preparation and pH-sensitive behavior in electrolyte solution
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PVA/PAA thermo-induced hydrogel fiber: Preparation and pH-sensitive behavior in electrolyte solution

机译：PVA / PAA热诱导水凝胶纤维：在电解质溶液中的制备及其对pH的敏感行为

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摘要

The preparation of thermo-induced hydrogel fibers composed of poly(vinyl alcohol) and poly(acrylic acid) is presented. The hydrogel fiber was prepared by extruding the spinning dope from in situ polymerization of acrylic acid in the presence of PVA into a coagulating bath of saturated ammonium sulfate aqueous solution. The network was formed by thermally heating the dried fibers under vacuum. The final hydrogel fibers exhibit pH-sensitive behavior and show a hysteresis loop in the pH range from 3.0 to 12.0. The pH value, at which the swelling elongation ratio of the fiber had a jump, shifted to a lower value with increasing PAA content within the network. Increasing the heating temperature and time for the fibers, decreased the swelling elongation ratio, and the jump point pH shifted to higher pH value. The oscillatory swelling/contracting behavior of the hydrogel fiber exhibited a good reversible pH-responsive property. Transmission Electron Microscopy (TEM) showed that PVA and PAA have good compatibility and give a relative independent interpenetrating network. Scanning Electron Microscopy (SEM) showed that in the surface of the fibers there were microholes and ditches due to some diffusion of PAA into the coagulating solution. (C) 2002 Wiley Periodicals, Inc. [References: 32]
机译：介绍了由聚乙烯醇和聚丙烯酸组成的热诱导水凝胶纤维的制备方法。通过在PVA存在下将丙烯酸原位聚合挤出纺丝原液到饱和硫酸铵水溶液的凝结浴中来制备水凝胶纤维。通过在真空下加热干燥的纤维来形成网络。最终的水凝胶纤维表现出对pH敏感的行为，并在3.0至12.0的pH范围内显示出滞后回线。随着网络中PAA含量的增加，纤维的溶胀伸长率出现跳跃的pH值移至较低的值。增加纤维的加热温度和时间，降低溶胀伸长率，并且将跳跃点的pH值移至较高的pH值。水凝胶纤维的振荡溶胀/收缩行为表现出良好的可逆pH响应特性。透射电子显微镜（TEM）表明PVA和PAA具有良好的相容性，并提供了相对独立的互穿网络。扫描电子显微镜（SEM）显示，由于PAA在凝结溶液中的某些扩散，在纤维表面存在微孔和沟槽。 （C）2002 Wiley Periodicals，Inc. [参考：32]

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