NDLI: Probing substrate effects on relaxation dynamics of ultrathin poly(vinyl acetate) films by dynamic wetting of water droplets on their surfaces

Content Provider	Royal Society of Chemistry (RSC)
Author	Zheng, Fanfan Zhu, Yumei Yang, Juping Wang, Xinping Zuo, Biao
Copyright Year	2013
Abstract	The dynamic wetting of water droplets on ultrathin poly(vinyl acetate) (PVAc) films supported by substrates with tunable surface hydroxyl group content was investigated at room temperature. The jumping angle of water droplets on the ultrathin PVAc films decreased with increasing hydroxyl content on the substrate surface, while a smooth evolution of the water droplet contacting line emerged for the film supported by a substrate with 100% hydroxyl groups. The critical thickness of ultrathin PAVc films, through which the interfacial effect from substrate chemistry on the dynamic wetting of water droplets on their surfaces will disappear, was measured by this novel method and the results showed that the critical thickness increased from ∼35 nm to ∼75 nm with increasing hydroxyl content from 41% to 100% on the substrate. This relationship between critical thickness and hydroxyl content was attributed to the intensities of the hydrogen bonds, resulting in lower chain mobility at the interface and a higher elastic modulus of the whole ultrathin film. This study demonstrates that the dynamic wetting of a liquid droplet on ultrathin polymer films is very sensitive and effective to access their mechanical properties, relaxation behavior and those properties affected by the substrate surface chemistry.
Starting Page	11680
Ending Page	11689
Page Count	10
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	9
Issue Number	48
Journal	Soft Matter
DOI	10.1039/c3sm52150h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Elastic modulus Hydroxy group Polymer Surface science Vinyl acetate Hydrogen bond
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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