volume 275, issue 1-2, P73-83 2004
DOI: 10.1016/j.ijpharm.2004.01.038
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Abstract: The structure that contributes glass transition is the main skeleton structure, such as benzene ring, while small group, like methyl, start to move at lower temperature than Tg. On the other hand, for the carbons, such as carbonyl, their structure was restricted by inter- and/or intramolecular interaction, therefore, their molecular mobility was significantly low above Tg.