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The occurrence of the hexagonal phase in two long chain monodisperse carboxylic acids at high pressure

Hosier, I.L. (2008) The occurrence of the hexagonal phase in two long chain monodisperse carboxylic acids at high pressure Polymer, 49, (8), pp. 2127-2132.

Record type: Article


High-pressure differential thermal analysis (DTA) experiments have allowed the pressure–temperature phase diagrams to be constructed for the monoacid CH3–(CH2)190–COOH and the diacid HOOC–(CH2)192–COOH. The current work follows on from previous work concerning the high-pressure phase of various monodisperse n-alkanes. The use of a diamond anvil cell calibrated from DTA data has allowed the morphology of each sample to be investigated as a function of pressure and temperature and for the crystallization, melting and hexagonal/orthorhombic transitions to be examined directly. It was shown that the monoacid displayed a similar behaviour to the n-alkane of twice its chain length due to end group pairing, whereas the diacid shows a wider hexagonal stable region, which extends to pressures as low as 0.35 GPa. This enhanced stability is thought to be due to increased configurational entropy due to unlimited end group association.

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Published date: April 2008
Organisations: Electronics & Computer Science, EEE


Local EPrints ID: 265715
ISSN: 0032-3861
PURE UUID: 73fc4be6-d9f8-4f22-b57c-77902ce2568a
ORCID for I.L. Hosier: ORCID iD

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Date deposited: 15 May 2008 09:30
Last modified: 18 Jul 2017 07:24

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Author: I.L. Hosier ORCID iD

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