NDLI: Thermo-responsive stick-slip behavior of advancing water contact angle on the surfaces of poly(N-isopropylacrylamide)-grafted polypropylene membranes

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Thermo-responsive stick-slip behavior of advancing water contact angle on the surfaces of poly(N-isopropylacrylamide)-grafted polypropylene membranes

Content Provider	Springer Nature Link
Author	Wan, LingShu Meng, XiangLin Yang, YunFeng Tian, Jing Xu, ZhiKang
Copyright Year	2010
Abstract	Wettability of a solid surface is highly important to its practical application, especially for the surface that shows thermo-responsive properties. In this paper, we describe a thermo-responsive stick-slip behavior of water droplets on the surfaces of poly(N-isopropylacrylamide) (PNIPAM)-grafted polypropylene membranes. Field emission scanning electron microscope (FESEM) images elucidate that the morphology of PNIPAM-grafted membrane surface is thermo-responsive, i.e., the surface becomes rougher above the lower critical solution temperature (LCST) of PNIPAM. On the surface of nascent polypropylene membranes, the water droplet shows a smooth motion resulting in advancing and receding water contact angles of 111° and ∼65°, respectively. On the PNIPAM-grafted membrane surfaces, the water droplet shows a stick-slip pattern above the LCST, whereas it advances smoothly below the LCST. This phenomenon is reproducible and can be ascribed to the energy barriers enhanced by the shrink of PNIPAM chains above the LCST. We also find that the slip contact angle decreases from 102° to 92° after several stick-slip cycles. This decrease is attributed to the water adsorption on the grafted PNIPAM layer, which is confirmed by the continuous decrease of the receding water contact angle.
Starting Page	183
Ending Page	189
Page Count	7
File Format	PDF
ISSN	16747291
Journal	Science in China Series B: Chemistry
Volume Number	53
Issue Number	1
e-ISSN	18622771
Language	English
Publisher	SP Science in China Press
Publisher Date	2010-02-07
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	stick-slip behavior water contact angle thermo-responsive surface poly(N-isopropylacrylamide) polypropylene membrane Chemistry/Food Science
Content Type	Text
Resource Type	Article
Subject	Chemistry

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