Thermal stability of some polyquinazolone polymers: Effect of acid catalysis |
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Authors: | Hardy S O Chan Yee -Hing Lai J R Lusty E Khor |
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Institution: | (1) Department of Chemistry, National University of Singapore, 0511 Kent Ridge, Singapore;(2) School of Chemistry, Robert Gordon's Institute of Technology, St. Andrew Street, AB1 1HG Aberdeen, Scotland |
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Abstract: | Thermal properties of polyquinazolones (PQ) polymers prepared from 4,4 -diaminodiphenyl-3,3 -dicarboxylic acid (BDC) and 4,6-diamino-isophthalic acid (DAIA) with diacetamido derivative of a number of diammines have been studied by thermogravimetry (TG) and differential scanning calorimetry (DSC). The effect of acid catalysis was also investigated. The results show that polyquinazolones prepared from DAIA have higher thermal stabilities and glass transition temperatures compared to those prepared from BDC. This can be attributed to the more stable and rigid fused quinazolone backbone unit in the PQ/DAIA system. Both polymer systems show improved thermal stability in the presence of catalyst which is a direct result of increased number of fully cyclised quinazolone rings in the polymer.
Zusammenfassung Thermische Eigenschaften von aus 4,4-Diaminodiphenyl-3,3 -dicarbonsäure (BDC) und 4,6-Diaminoisophtalsäure (DAIA) mit Diacetoimido-Derivaten einer Auswahl von Diaminen hergestellten Polymeren von Polyquinazolon (PQ) wurden mittels TG und DSC untersucht. Die mit DAIA erhaltenen Polyquinazolone sind thermisch stabiler und weisen höhere Glasübergangstemperaturen auf als die mit BDC hergestellten. Das kann der stabileren und fester ankondensierten Quinazolonhauptketteneinheit im PQ/DAIA-System zugeschrieben werden. Beide Polymersysteme weisen in Gegenwart eines Katalysators eine verbesserte thermische Stabilität auf, was auf eine größere Anzahl von voll zyklisierten Quinazolonringen im Polymer zurückzuführen ist.
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Paper presented at the World Conference on Thermal Analysis, Madeira (Portugal), 1986. |
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