Surface modification of solid phase objects by poly(vinyl alcohol)
US7179506B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 3, 2002 |
| Grant date | Feb 20, 2007 |
| Priority date | — |
| Expiry date | Jun 3, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31971
- WIPO fieldMicro-structural and nano-technology
- WIPO sectorChemistry
Abstract
The adsorption of poly(vinyl alcohol) (PVOH) from aqueous solution to hydrophobic solid-phase objects with varying chemical compositions, sizes, and geometries, is assessed as a new approach for surface modification. The effects of PVOH concentration, adsorption kinetics, PVOH molecular weight, adsorption temperature, solution ionic strength and stepwise deposition on wettability and adsorbed amounts were analyzed by water contact angle and X-ray Photoelectron Spectroscopy. PVOH adsorbs to solids significantly different than do other molecules. A much larger adsorbed amount and more dramatic improvement of wettability occurs compared to other molecules. The low solubility of PVOH, the strong tendency for it to crystallize at the solid/water interface and stabilization of the PVOH film by inter- and intra-molecular hydrogen bonding give additional driving forces for adsorption. The available —OH group from adsorbed PVOH is a versatile functional group and is further chemically transformed to a range of other functional groups to impart desired surface properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.