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Projecting long-term non-Fickian diffusion behavior in polymeric composites based on short-term data: a 5-year validation study.

Projecting long-term non-Fickian diffusion behavior in polymeric composites based on short-term data: a 5-year validation study.

Authors :
Grace, Landon
Source :
Journal of Materials Science; Jan2016, Vol. 51 Issue 2, p845-853, 9p, 1 Black and White Photograph, 2 Charts, 5 Graphs
Publication Year :
2016

Abstract

The slow approach to equilibrium concentration indicative of non-Fickian diffusion in polymer composites necessitates experimental time frames which are often of limited feasibility. As a result, experimental studies are terminated prematurely due to time constraints or incorrect identification of equilibrium. Here, the three-dimensional anisotropic diffusion behaviors of six-, twelve-, and forty-ply quartz-reinforced bismaleimide laminates are quantified through a 5-year, full-immersion gravimetric absorption study. The applicability of the three-dimensional hindered diffusion model is investigated, while projections of future absorption behavior made at 21 months are revisited in light of 3 years of additional data. The mathematical equivalency of the hindered diffusion model and a diffusion-relaxation model under certain conditions is discussed. Moisture content rises continuously throughout the 5-year experiment for all samples. In the six-ply case, the standard termination criterion for the equilibrium condition is met before 6 months and 1.38 % moisture content by weight. Actual moisture content reaches 1.56 % after 5 years. The hindered diffusion model and associated forward projections of moisture content are found to conform well to experimental results. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00222461
Volume :
51
Issue :
2
Database :
Complementary Index
Journal :
Journal of Materials Science
Publication Type :
Academic Journal
Accession number :
110953085
Full Text :
https://doi.org/10.1007/s10853-015-9407-0