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

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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.

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Acknowledgments

The author wishes to acknowledge the support of Chugach, Inc. and the United States Air Force (W15P7T-09-D-S609) for partial support of this study.

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  1. Department of Mechanical and Aerospace Engineering, University of Miami, 1251 Memorial Dr. STE 205, Coral Gables, FL, 33146, USA

    Landon R. Grace

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  1. Landon R. Grace
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Correspondence to Landon R. Grace.

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Grace, L.R. Projecting long-term non-Fickian diffusion behavior in polymeric composites based on short-term data: a 5-year validation study. J Mater Sci 51, 845–853 (2016). https://doi.org/10.1007/s10853-015-9407-0

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  • DOI: https://doi.org/10.1007/s10853-015-9407-0

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