Abstract
Softening temperatures Ts and melting temperatures Tm of a great number of aromatic polyimides and their chemical derivatives have been studied. The results obtained are generalized. The analysis is based on the chemical classification of polyimides taking into account the presence and location of “hinge” atoms and atom groups making polymer chain flexible. If there are such “hinges” in both components of a monomer unit then Ts and T are distinctly revealed. For these polyimides the dependence of Ts and Tm on the number of “hinges” in a monomer unit cân be súccessfully explained by the well-known physical theories of transition temperatures of polymers. Other groups of polyimides have no distinct Ts and Tm and are usually considered as “infusible”. Calculations and experiments have shown that it is because in these groups the values of Ts and Tm are close to or higher than the value of the polyimide thermal degradation temperati e. The maximum values of Ts and Tm can be as high as ≃ 1000 and ≃ 1300°C, respectively. The influence of chemical structure on Ts and Tm for the whole class of aromatic polyimides can be understood if strong intermolecular interaction of benzimide rings and internal degrees of freedom in monomer units are taken into consideration. Simple models are used in this work for this purpose. The conclusions made here are thought to be valid both for aromatic polyimides and other related classes of polyheteroarylenes.
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Bessonov, M.I., Kuznetsov, N.P. (1984). Softening and Melting Temperatures of Aromatic Polyimides. In: Mittal, K.L. (eds) Polyimides. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-7637-2_26
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DOI: https://doi.org/10.1007/978-1-4615-7637-2_26
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