Investigation of Methacrylic Acid at High Pressure Using Neutron Diffraction

This article shows that pressure can be a low-intensity route to the synthesis of polymethacrylic acid. The exploration of perdeuterated methacrylic acid at high pressure using neutron diffraction reveals that methacrylic acid exhibits two polymorphic phase transformations at relatively low pressure...

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Bibliographic Details
Published in:The journal of physical chemistry. B 2015-09, Vol.119 (36), p.12147-12154
Main Authors: Marshall, William G, Urquhart, Andrew J, Oswald, Iain D.H
Format: Article
Language:English
Subjects:
Deterioration
Exploration
Low pressure
Methacrylates - chemistry
Methacrylic acid
Models, Molecular
Molecular Conformation
Neutron Diffraction
Phase transformations
Phase Transition
Polymerization
Pressure
Transformations
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Summary:This article shows that pressure can be a low-intensity route to the synthesis of polymethacrylic acid. The exploration of perdeuterated methacrylic acid at high pressure using neutron diffraction reveals that methacrylic acid exhibits two polymorphic phase transformations at relatively low pressures. The first is observed at 0.39 GPa, where both phases were observed simultaneously and confirm our previous observations. This transition is followed by a second transition at 1.2 GPa to a new polymorph that is characterized for the first time. On increasing pressure, the diffraction pattern of phase III deteriorates significantly. On decompression phase III persists to 0.54 GPa before transformation to the ambient pressure phase. There is significant loss of signal after decompression, signifying that there has been a loss of material through polymerization. The orientation of the molecules in phase III provides insight into the possible polymerization reaction.
ISSN:1520-6106
1520-5207
DOI:10.1021/acs.jpcb.5b07106