1. Dielectric and Mechanical Investigations on the Hydrophilicity and Hydrophobicity of Polyethylene Oxide Modified on a Silicon Surface
- Author
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Jing Shang, Jian Shen, Kunlun Hong, Tao Wang, and Dan Zhu
- Subjects
Materials science ,Silicon ,Ultra-high vacuum ,chemistry.chemical_element ,macromolecular substances ,02 engineering and technology ,Dielectric ,010402 general chemistry ,01 natural sciences ,Contact angle ,Monolayer ,Polymer chemistry ,Electrochemistry ,General Materials Science ,Spectroscopy ,Aqueous solution ,technology, industry, and agriculture ,Surfaces and Interfaces ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,0104 chemical sciences ,Dielectric spectroscopy ,Anionic addition polymerization ,Chemical engineering ,chemistry ,0210 nano-technology - Abstract
Polyethylene oxide (PEO) has been widely used in biomedical fields. The antibiofouling property of the PEO-modified surface has been extensively investigated but is far from being fully understood. A series of PEOs with narrowly distributed molecular weight (Mw), synthesized with the technique of high vacuum anionic polymerization, have been successfully grafted onto the surface of silicon wafers. The power-law relationship between the thickness of the monolayer versus the Mw of the grafted PEO shows a scaling of 0.3, indicating compact condensing of the chains. The static contact angles show higher hydrophobicity for the layer of PEO with higher Mw, which can be attributed to the closely packed conformation of the chains with high density. The frequency shift of the contact resonance indicates that the Young’s modulus decreases and the loss factor increases with the increase in the Mw of PEO and the thickness of the PEO layers. Dielectric spectroscopy of bare or PEO-grafted wafers in the aqueous solution...
- Published
- 2016