Journal article
Role of free volume in molecular mobility and performance of glassy polymers for corrosion-protective coatings
Corrosion Engineering, Science, and Technology, Vol.55(2), pp.145-158
17/02/2020
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Abstract
Glassy polymer coatings on metal substrates rely on their mechanical, physical, and transport properties for corrosion protection. These properties are influenced by free volume between polymer chains that plays a critical role in coating performance. Free volume permits local segmental mobility that affects mechanical properties, such as yield and adhesion, and also permits diffusion of small molecules (water, ions, and oxygen) through the coating to the substrate. Fractional free volume is calculated from the specific volume and Bondi group contribution theory for the occupied volume. Free volume distribution (free volume element size and number) is measured by positron annihilation lifetime spectroscopy (PALS) using the ortho-positronium (oPs) probe, which detects free volume elements in glassy polymer coatings. The oPs probe is sensitive to phenomena that affect both the mechanical and barrier properties of coatings including physical ageing, water sorption, and plasticisation, making PALS a suitable allied testing method for corrosion-protective coatings.
Details
- Title
- Role of free volume in molecular mobility and performance of glassy polymers for corrosion-protective coatings
- Creators
- A. J. Hill - Commonwealth Scientific and Industrial Research OrganisationA. W. Thornton - Commonwealth Scientific and Industrial Research OrganisationR. H. J. Hannink - Commonwealth Scientific and Industrial Research OrganisationJ. D. Moon - The University of Texas at AustinB. D. Freeman - The University of Texas at Austin
- Publication Details
- Corrosion Engineering, Science, and Technology, Vol.55(2), pp.145-158
- Publisher
- Taylor & Francis
- Grant note
- B.D.F. gratefully acknowledges partial support by the Australian-American Fulbright Commission for the award to B.D.F. of the U.S. Fulbright Distinguished Chair in Science, Technology and Innovation sponsored by the Commonwealth Scientific and Industrial Research Organisation (CSIRO) [grant no. 6535]. This material is based upon work supported in part by the National Science Foundation Graduate Research Fellowship Program [grant no. DGE-1610403 awarded to J.D.M.].
- Identifiers
- 991013036378502368
- Academic Unit
- Science; Faculty of Science and Engineering
- Language
- English
- Resource Type
- Journal article