NDLI: Influence of molar mass on the diffusion and solubility behaviour of methyl ethyl ketone-isopropyl alcohol mixtures in poly(methyl methacrylate)

Content Provider	Royal Society of Chemistry (RSC)
Author	Pethrick, Richard A. Rankin, Kathleen E.
Copyright Year	1998
Abstract	Poly(methyl methacrylate) PMMA is used extensively as an electron beam resist. The development of the lithographic pattern after exposure of the polymer to electron beam irradiation is achieved by contacting the film with a solvent mixture of isopropyl alcohol and methyl ethyl ketone. In this paper the mutual diffusion coefficients for isopropyl alcohol-methyl ethyl ketone mixed solvents into PMMA of narrow molar mass distribution with a range from 49000 to 400000 g mol –1 are reported. The mutual diffusion coefficient indicates that the behaviour was both a function of molar mass and solvent composition. The ability for the PMMA to swell in the solvent was found to be molar mass dependent. Cloud point measurements on solutions indicated that change in the molar mass influenced the temperature at which precipitation occurred in the mixed solvents. The cloud points also depended on the quality of the solvent; occurring at lower temperature for the better solvent [1:1 w/w isopropyl alcohol (IPA)-methyl ethyl ketone (MEK)] and being higher for the poorer solvent (4:1 w/w IPA-MEK). The swelling characteristics indicate that an increase in the degree of chain entanglement leads to suppression of the degree of swelling. The electron beam sensitivity suggests a complex interplay of the effects of the molar mass on the chain scission process, on the ability of solvent to enter the degraded matrix and on the solubility of the polymer on the solvent mixture. The casting solvent has an effect on the structure of the solid and influences the behaviour of the films when exposed to the developing solvent.
Starting Page	2599
Ending Page	2603
Page Count	5
File Format	PDF
ISSN	09599428
Volume Number	8
Issue Number	12
Journal	Journal of Materials Chemistry
DOI	10.1039/a802465k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	PMMA Poly(methyl methacrylate) Para-Methoxy-N-methylamphetamine Polymer Solvent Isopropyl alcohol Butanone Diffusion Propyl group Ketone Molar mass distribution Molar mass Cloud point Cloud Interplay Entertainment
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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