Synthesis of Superheat-Resistant Polyimides with High Tg and Low Coefficient of Thermal Expansion by
Introduction of Strong Intermolecular Interaction
Posted on 2018-12-06 - 13:19
The
development of polyimides (PIs) with a superheat resistance and a
high thermal dimensional stability is required urgently for application
in the rapidly growing area of flexible-display substrates. Based
on an enhanced intermolecular interaction, 2,2′-p-phenylenebis(5-aminobenzimidazole) (DP) that contains bis-benzimidazole
was synthesized, and two series of its copolyimides (PI-a and PI-b)
were prepared by copolycondensation with 5-amino-2-(4-aminobenzene)benzimidazole
(PABZ) and 5-amino-2-(3-aminobenzene)benzimidazole (i-PABZ), respectively. The high density and packing coefficient
of the resulting PIs caused by the strong intermolecular interaction
from the hydrogen bonds and the charge-transfer complex provided the
PI films with a very high glass-transition temperature (Tg > 450 °C) and an extremely low coefficient of
thermal expansion (CTE) below 10 ppm/K for PI-a. Such good thermal
properties expand their application as high thermostable materials.
Furthermore, the PI-b had a higher Tg than
PI-a, whereas the latter had lower CTE values because of the configuration
difference of their polymer chains. These data indicate that the resultant
thermostable copolyimides have potential application as a flexible-display
substrate and provide a feasible method to improve the thermal properties
by incorporating bis-benzimidazole moieties.
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Lian, Meng; Lu, Xuemin; Lu, Qinghua (2018). Synthesis of Superheat-Resistant Polyimides with High Tg and Low Coefficient of Thermal Expansion by
Introduction of Strong Intermolecular Interaction. ACS Publications. Collection. https://doi.org/10.1021/acs.macromol.8b02282
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