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| Compared with the mono-substituted1B-TPA, the Tg of3B-TPAwas higher by 76.4 C. The DSC curves of the samples in the first and second heating runs are shown in Figs 1 and 2, respectively. In the first heating run, only compound 1B-TPAexhibited a very small meltingtransition peak at 236.5 C. In the second heating run, only a glass transition could be observed for each compound. This indicates that the compounds exhibited a very low tendency towards crystallization, as no melting peak could be detected, which is ascribed to the starburst structures. Amorphous mate-rials possessing a highTgcould have a better chance to retain film morphology during device operation |
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