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Study of water vapor permeability of shape memory polyurethane nanofibrous nonwovens

机译:形状记忆聚氨酯纳米纤维非织造布的水蒸气透过性研究

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摘要

In this paper, water vapor permeability (WVP) properties of shape memory polyurethane (SMPU) nanofibrous nonwovensrnare investigated systematically. The results indicate that, in addition to the excellent shape memory effect, the SMPUrnnanofibrous nonwovens show excellent liquid transfer properties and water vapor transport properties. Moreover, thernWVP of a SMPU nanofibrous nonwoven is sensitive to the change of relative humidity (RH) and temperature. Forrnexample, the WVP decreases with the increase of RH above a critical RH, e.g. 50%, and increases significantly with thernincrease of temperature below a turnover temperature, e.g. 50u0002C. The diameter of the nanofiber has little influence onrnthe WVP while the turnover temperature is higher in SMPU nanofibrous nonwovens with larger diameters. Finally, SEMrnimages at a higher temperature suggest that the porous nanofibrous nonwoven structure is the foundation of uniquernWVP properties, and the collapse of the nanofiber at the higher temperature results in the abrupt decrease in WVP.
机译:本文系统地研究了形状记忆聚氨酯(SMPU)纳米纤维非织造布的水蒸气透过率(WVP)性能。结果表明,除了优异的形状记忆效果以外,SMPU纳米纤维非织造布还显示出优异的液体转移性能和水蒸气输送性能。此外,SMPU纳米纤维非织造布的WVP对相对湿度(RH)和温度的变化敏感。举例来说,WVP随相对湿度(RH)高于临界相对湿度(例如RH)的增加而降低。 50%,并且在低于周转温度(例如,最高温度)时温度升高而显着增加。 50u0002C。纳米纤维的直径对WVP影响很小,而直径较大的SMPU纳米纤维非织造布的周转温度较高。最后,在较高温度下的SEM图像表明,多孔纳米纤维非织造结构是独特的WVP性能的基础,而纳米纤维在较高温度下的塌陷导致WVP的突然降低。

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