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Open AccessArticle

Carborane-Containing Aromatic Polyimide Films with Ultrahigh Thermo-Oxidative Stability

1
Laboratory of Advanced Polymer Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
2
School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
3
Shanghai Institute of Aerospace Systems Engineering, Shanghai 201108, China
*
Authors to whom correspondence should be addressed.
Polymers 2019, 11(12), 1930; https://doi.org/10.3390/polym11121930
Received: 28 October 2019 / Revised: 11 November 2019 / Accepted: 12 November 2019 / Published: 22 November 2019
(This article belongs to the Section Polymer Processing and Performance)
Carborane-containing aromatic polyimide (CPI) films with ultrahigh thermo-oxidative stability at 700 °C have been prepared by casting poly(amic acid) (PAA) resin solution on a glass surface, followed by thermal imidization at elevated temperatures. The PAA solution was prepared by copolymerization of an aromatic dianhydride and an aromatic diamine mixture, including carborane-containing aromatic diamine in an aprotic solvent. The CPI films showed excellent thermo-oxidative stability at 700 °C due to the multilayered protection layers formed on the film surface by thermal conversion of the carborane group into boron oxides. The boron oxide layer enhanced the degradation activation energy and suppressed the direct contact of inner polymer materials with oxygen molecules in a high-temperature environment, acting as a “self-healing” skin layer on the polyimide materials. The CPI-50 film was still flexible and maintained 50% retention of mechanical strength even after thermo-oxidative aging at 700 °C/5 min. The mechanism of thermo-oxidative degradation was proposed. View Full-Text
Keywords: polyimide; carborane; thermo-oxidative stability; self-healing layer polyimide; carborane; thermo-oxidative stability; self-healing layer
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MDPI and ACS Style

Liu, F.; Fang, G.; Yang, H.; Yang, S.; Zhang, X.; Zhang, Z. Carborane-Containing Aromatic Polyimide Films with Ultrahigh Thermo-Oxidative Stability. Polymers 2019, 11, 1930.

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