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首页> 外文期刊>RSC Advances >Morphology and hydroscopic properties of acrylic/thermoplastic polyurethane core-shell electrospun micro/nano fibrous mats with tunable porosity
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Morphology and hydroscopic properties of acrylic/thermoplastic polyurethane core-shell electrospun micro/nano fibrous mats with tunable porosity

机译：可调谐孔隙率丙烯酸/热塑性聚氨酯芯 - 壳体壳体微/纳米纤维垫的形态学和水上磷酸性能

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A coaxial electrospinning set up was developed in an electrospinning machine to produce core-shell nanofibers of hydrophobic thermoplastic polyurethane (TPU) and acrylic (textile grade, hydrophilic polyacrylonitrile - PAN). The TEM images showed the average diameter of PAN/TPU to be 107 nm with a core of 65 nm while TPU/PAN core-shell nanofibers have 156 nm average diameter with 82 nm core. FTIR data confirms the presence of TPU and PAN on core-shell electrospun micro/nano fibrous mats. The PAN/TPU core-shell electrospun mat exhibited better mechanical properties compared to TPU/PAN core-shell fibrous mats. Water contact angle results indicate that the shell polymer's hydroscopic (hydrophilic/hydrophobic) property influences the surface properties of electrospun mats. The water retention value tests were also performed for all electrospun fibers. The swelling thickness and porosity change in water were studied for pure TPU and PAN/TPU core-shell electrospun mats at two different temperatures (28 degrees C and 45 degrees C) for 20 min. The PAN/TPU core-shell mat showed an increase in swelled fiber diameter and a decrease in overall porosity with time which is more prominent at higher temperature (45 degrees C) due to the increase in vapor pressure from the hydrophilic core to its hydrophobic shell. The average porosity was found to be decreased from 62% to 48% at 45 degrees C while it was decreased from 61% to 52% at 28 degrees C, with immersion time of 20 min. Such an effect is not observed for pure TPU mat. Porosity increases at higher temperature as this elastomer shrinks. This property of PAN/TPU core-shell electrospun membrane makes it a good candidate for smart waterproof membranes.
机译：在静电纺丝机中开发了一种同轴电纺丝设置，以生产疏水性热塑性聚氨酯（TPU）和丙烯酸（纺织级，亲水聚丙烯腈 - 锅）的核 - 壳纳米纤维。 TEM图像显示PAN / TPU的平均直径为107nm，核心为65nm，而TPU / PAN核壳纳米纤维具有156nm平均直径，具有82nm核心。 FTIR数据证实了TPU的存在和芯壳Electrowun微/纳米纤维垫上的锅。与TPU / PAN芯壳纤维垫相比，PAN / TPU芯壳电纺MAT表现出更好的机械性能。水接触角结果表明壳体聚合物的脊椎（亲水/疏水性）性能影响Electrom淘垫的表面性质。还对所有电纺纤维进行水保持值测试。研究了水的溶胀厚度和孔隙率变化，用于纯TPU和PAN / TPU核心 - 壳电纺垫，在两个不同的温度（28℃和45℃）下20分钟。 PAN / TPU核 - 壳垫显示出膨胀的纤维直径增加，并且由于来自亲水核的蒸气压增加而在较高温度（45℃）上的较高温度（45摄氏度）的趋散率下降。发现平均孔隙率在45摄氏度下从62％降低到45℃，而在28℃下从61％降至52％，浸入时间为20分钟。纯TPU垫未观察到这种效果。当该弹性体收缩时，孔隙率在较高温度下增加。 PAN / TPU核心壳电纺器膜的这种特性使其成为智能防水膜的良好候选者。

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  • 来源
    《RSC Advances》 |2016年第59期|共7页
  • 作者

    Safeeda Fathima N. V; Gopinathan Janarthanan; Indumathi Balakrishnan; Thomas Sabu; Bhattacharyya Amitava;

  • 作者单位

    PSG Inst Adv Studies Adv Text &

    Polymer Res Lab Coimbatore 641004 Tamil Nadu India;

    PSG Inst Adv Studies Adv Text &

    Polymer Res Lab Coimbatore 641004 Tamil Nadu India;

    PSG Inst Adv Studies Adv Text &

    Polymer Res Lab Coimbatore 641004 Tamil Nadu India;

    Mahatma Gandhi Univ Sch Chem Sci Kottayam 686560 India;

    PSG Inst Adv Studies Adv Text &

    Polymer Res Lab Coimbatore 641004 Tamil Nadu India;

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