Preparation and antibacterial activity of superhydrophobic PET fabric

doi:10.3969/j.issn.0438-1157.2014.04.049

Abstract

Abstract: The textile fabric possessing superhydrophobic surface can exhibit excellent self-cleaning performance. In this work, PET nonwoven fabric was used as substrate and a route to fabricating superhydrophobic coating possessing hierarchical micro/nano structures with a sol-gel method on the pretreated PET fabric surface was explored. The microstructure and wettability of the modified PET fabric surfaces were characterized with SEM and water contact angle measurement. Furthermore, the antibacterial activities of the modified PET fabric against E. coli and S. aureus were evaluated and analyzed via the bacterial transfer method and the inhibition zone test, respectively. The results indicated that the hierarchical micro/nano structures could be successfully constructed on the PET fabric surface by the in-situ formation of SiO₂ nanoparticles on the alkali-treated PET fabric surface, which was conducted via the modified Stöber sol-gel process, and the subsequent surface modification with n-dodecyltrimethoxysilane (DTMS) bearing long hydrophobic chain followed by appropriate heat treatment. The as-prepared PET fabric surface could exhibit superhydrophobicity with a water contact angle of 163°. Besides, the prepared superhydrophobic PET fabric could suppress bacterial growth and reproduction on its surface, thus showing obvious antibacterial activity.

Key words: PET fabric, superhydrophobic surface, nanotechnology, silica, sol-gel method, antibacterial activity

摘要： 纺织物表面的超疏水特性将赋予其优异的自清洁性能。以PET无纺布为基材，探索了利用溶胶-凝胶法在预处理后的PET织物表面构筑具有微纳结构的超疏水涂层的方法；并利用扫描电镜（SEM）、接触角测量仪表征了改性PET织物表面的微观结构和润湿性。进一步地，分别以大肠杆菌和金黄色葡萄球菌为试验菌株，通过细菌转移法和抑菌圈法评价与分析了改性PET织物表面的抗菌性能。研究表明：利用改进的Stöber溶胶-凝胶过程能够在经碱减量法预处理的PET表面原位形成SiO₂纳米粒子；再用含疏水性长链的十二烷基硅烷对这一表面进行改性，并经过表面热处理，就能够成功地在PET织物表面构筑多层次的微/纳结构，从而制得表面具有超疏水特性的PET织物，其接触角可达到163°。这一超疏水PET织物能够抑制细菌在其表面的生长繁殖，表现出了明显的抗菌特性。

关键词: PET织物, 超疏水表面, 纳米技术, 二氧化硅, 溶胶-凝胶法, 抗菌性能

CLC Number:

F768.1

LIU Yunhong, LI Guangji, CHEN Chao, PENG Xinyan, WANG Liying, CHEN Zhifeng. Preparation and antibacterial activity of superhydrophobic PET fabric[J]. CIESC Journal, 2014, 65(4): 1517-1525.

刘云鸿, 李光吉, 陈超, 彭新艳, 王立莹, 陈志锋. 超疏水PET织物的制备及其抗菌性能[J]. 化工学报, 2014, 65(4): 1517-1525.

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