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Methanol desorption in poly(methyl methacrylate) with stress distributions

Published online by Cambridge University Press:  26 September 2014

Donyau Chiang ,
Fuqian Yang ,
Chi Wei Liu ,
Kuo-Chen Ho  and
Sanboh Lee
Donyau Chiang
Affiliation:
Instrument Technology Research Center, National Applied Research Laboratories, Hsinchu 300, Taiwan
Fuqian Yang
Affiliation:
Department of Chemical and Materials Engineering, University of Kentucky, Lexington, Kentucky 40506, USA
Chi Wei Liu
Affiliation:
Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 300, Taiwan
Kuo-Chen Ho*
Affiliation:
Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 300, Taiwan
Sanboh Lee*
Affiliation:
Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 300, Taiwan
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Understanding solvent transport in polymers is of practical importance for the applications of polymers in the fields of food packaging, biomedical bandages, materials engineering, etc. We studied one-side desorption in poly(methyl methacrylate) (PMMA). Experimental results showed that methanol desorption in PMMA depended on temperature and the initial distribution of concentration. The diffusion coefficient in PMMA and the evaporation rate of methanol across the PMMA surface followed the Arrhenius relation. The activation energies for the diffusion and the evaporation of methanol are 18.3, 42.6 and 8.6, 18.3 kJ/mol for the specimens with the ratio of initial mass to the equilibrium saturated absorbed mass, Mi/M∞, being 14.6% and 35.3%, respectively. The partial molal volume increased with the increase of the desorption temperature for Mi/M∞ = 14.6%, while it had an opposite trend for Mi/M∞ = 35.5%. The chemical stresses developed in PMMA during the desorption were also studied.

Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 18 , 28 September 2014 , pp. 2162 - 2169
Copyright
Copyright © Materials Research Society 2014 

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