Preparation of atactic poly(vinyl alcohol) nanoweb having high water resistance by heat treatment


W. Lyoo1, S. Lee1, J. Cha1, M. Kim1, S. Lee1, S. Han1, M. Lee1, C. Kim2, Y. Chung3 and S. Han1

1Division of Advanced Organic Materials, School of Textiles, Yeungnam University, Gyeongsan, Korea
2WooJinChem Co., Ltd., Gyochon-ri, Jain-Myeon, Gyeongsan-si, Gyeongsangbuk-do, Korea
3Department of Textile Engineering, Chunbuk National University, Jeonju, Korea

Keywords: electrospinning
property: water resistance
material: a-PVA nanoweb

Poly(vinyl alcohol) (PVA) is typically water-soluble polymer, which is a good material of no toxicity for human, and biodegradable polymer. Nanoscale materials can be rationally designed to exhibit significantly changed physical, chemical, and biological properties, because of extremely small dimension. Therefore, atactic PVA (a-PVA) nanowebs by electrospinning technique have very high water solubility owing to its nanoscale compared with microscale materials such as fiber and film. Electrospinning for the preparation of ultrafine polymer fibers has been drawing great attention due to their various applications in separation filters, wound dressing materials, tissue scaffolds, and sensors, etc. It is obviously desirable to reduce the diameter of ultrafine fibers as much as possible in order to obtain outstanding properties such as high specific surface area and high porosity. In this study, we prepared water-soluble atactic PVA (a-PVA) nanoweb using electrospinning. Then, to improve water-resistance of PVA nanoweb prepared, the nanoweb was heat-treated at four different temperatures. The structure and properties of PVA nanoweb were investigated by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), wide-angle X-ray diffractometer (WAXD), Instron, and degree of solubility. The melting temperature of heat-treated PVA nanowebs shifted toward the low temperature with an increase in the heat treat temperature, indicating that micronetwork domains formed. Moreover, with the exception of PVA nanoweb treated at excessive heat treatment temperature, heat-treated PVA nanowebs showed higher crystalline properties and mechanical properties to a pure PVA nanoweb. This work was supported by grant No. RTI04-01-04 from the Regional Technology Innovation Program of the Ministry of Knowledge Economy (MKE).

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