Lee Suhyun, Park Chung Hee
Department of Textiles, Merchandising and Fashion Design, Seoul National University Seoul 08826 Republic of Korea
RSC Adv. 2018 Sep 4;8(54):31008-31018. doi: 10.1039/c8ra05530k. eCollection 2018 Aug 30.
This study was carried out to improve durability and reduce conductivity degradation of polypyrrole-deposited cotton fabrics by introducting a superhydrophobic surface. An polymerization method was used to polymerize the polypyrrole on the cotton fabric, and the surface energy was lowered using -dodecyltrimethoxysilane to create a superhydrophobic surface. In particular, to investigate the durability of the conductivity according to the superhydrophobic surface, the changes of surface resistance were examined after repeated exposure to air, moisture, and friction. The polypyrrole-deposited cotton fabric displayed excellent electrical heating features originating from the conductive polymer, although the surface resistance was somewhat increased by the superhydrophobic coating. In addition, nano-roughness was obtained by the pyrrol-deposition on the fabric surface, creating a dual-roughness property required for the superhydrophobic surface. Accordingly, the conductive superhydrophobic cotton fabric had a contact angle of more than 150° and a shedding angle of less than 10°, maintaining superhydrophobicity even during electrical heating. Above all, the superhydrophobic layer contributed to the functional durability of the conductive fabrics by protecting the conductive layer. After atmospheric aging for 20 weeks, undergoing a water spray test for 20 cycles, and a rubbing test with tape, the increment of surface resistance of the superhydrophobic coated cotton fabrics with polypyrrole was increased by up to 30% compared to the polypyrrole treated specimen without the coating, which showed a decrease of conductivity of over 74%. It is confirmed that the self-cleaning properties can easily remove dirt on the cotton fabric surface by roll-off of water droplets, thereby preventing the degradation of conductivity due to moisture and contamination.
本研究旨在通过引入超疏水表面来提高聚吡咯沉积棉织物的耐久性并减少其导电性退化。采用一种聚合方法在棉织物上聚合聚吡咯，并使用十二烷基三甲氧基硅烷降低表面能以形成超疏水表面。特别地，为了研究超疏水表面对导电性耐久性的影响，在反复暴露于空气、湿气和摩擦后检测表面电阻的变化。尽管超疏水涂层使表面电阻有所增加，但聚吡咯沉积棉织物仍展现出源自导电聚合物的优异电加热特性。此外，通过在织物表面沉积吡咯获得了纳米粗糙度，形成了超疏水表面所需的双重粗糙度特性。因此，导电超疏水棉织物的接触角大于150°，滚落角小于10°，即使在电加热过程中也能保持超疏水性。最重要的是，超疏水层通过保护导电层有助于提高导电织物的功能耐久性。在经过20周的大气老化、20次循环的喷水试验以及用胶带进行的摩擦试验后，与未涂层的聚吡咯处理试样相比，涂覆有聚吡咯的超疏水棉织物的表面电阻增量最多增加了30%，而未涂层试样的导电性下降超过74%。证实了自清洁性能可通过水滴滚落轻松去除棉织物表面的污垢，从而防止因湿气和污染导致的导电性退化。
