Pulsed plasma polymerized maleic anhydride films in humid air and in aqueous solutions studied with optical waveguide spectroscopy

Langmuir : the ACS Journal of Surfaces and Colloids
Li-Qiang ChuWolfgang Knoll

Abstract

Optical waveguide spectroscopy (OWS) was employed to monitor the swelling behavior of pulsed plasma polymerized maleic anhydride (PPPMA) films in humid air and in aqueous solutions by measuring the film thicknesses and refractive indices. With the relative humidity of air increasing, both the thickness and the refractive index of the PPPMA films increased, indicating water penetration into and uptake by the films. The swelling of the hydrated PPPMA films in humid air is reversible. In aqueous media, the thickness and the refractive index of the washed PPPMA film increased with an increase of pH and ionic strength, respectively. On the basis of the present data, a hypothesis concerning the structure of the PPPMA film is proposed. Our model suggests that the unique structure of the PPPMA films originates from the cyclic structure of maleic anhydride and depends on parameters of the plasma deposition process, and the interaction between H(2)O and the carboxylic groups.

References

Mar 12, 2004·Annual Review of Physical Chemistry·W Knoll

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Citations

Dec 7, 2018·Biointerphases·Hannah J AskewSally L McArthur
May 7, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Gautam Mishra, Sally L McArthur
Sep 14, 2010·Biomacromolecules·Luis DuqueRenate Förch
Nov 9, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·P SamynV Roucoules
Jul 24, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Yang ZhouMark D Foster

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