

FOLLOWUS
a.School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, China
b.Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
fengld@ciac.ac.cn (L.D.F.)
xschen@ciac.ac.cn (X.S.C.)
Received:03 May 2024,
Revised:2024-09-06,
Accepted:11 September 2024,
Online First:11 November 2024,
Published:01 December 2024
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Wang, H.; Liu, Z. C.; Shang, X.; Feng, L. D.; Bian, X. C.; Chen, X. S. Crosslinked colorless polyimide films via oxazole groups as crosslinking agent: preparation and properties. Chinese J. Polym. Sci. 2024, 42, 1905–1914
He Wang, Zhen-Chao Liu, Xue Shang, et al. Crosslinked Colorless Polyimide Films
Wang, H.; Liu, Z. C.; Shang, X.; Feng, L. D.; Bian, X. C.; Chen, X. S. Crosslinked colorless polyimide films via oxazole groups as crosslinking agent: preparation and properties. Chinese J. Polym. Sci. 2024, 42, 1905–1914 DOI: 10.1007/s10118-024-3235-0.
He Wang, Zhen-Chao Liu, Xue Shang, et al. Crosslinked Colorless Polyimide Films
A series of crosslinked CPI films were prepared by incorporating 1
3-PBO as a crosslinking agent. The reaction between oxazole and carboxyl groups forms crosslinked structures
while partially transforms the rigid imide rings into more flexible groups. This approach provides an efficient strategy to enhance the comprehensive performance of CPI by balancing the formation of crosslinks with chain flexibility.
A series of transparent crosslinked colorless polyimide (CPI) films are prepared from 3
3’
4
4’-biphenyltetracarboxylic dianhydride (BPDA)
2
2’-bis(trifluoro-methyl)benzidine (TFMB)
and 4
4’-oxydianiline (ODA) by thermal imidization
incorporating varying contents of 2
2'-(1
3-phenylene)bis(2-oxazoline) (1
3-PBO) as the crosslinking agent. Following the incorporation of the crosslinking structure
the CPI films show good optical transparency (approximately 85% winthin visible light range)
enhanced glass transition temperature (from 325 °C to 341 °C)
and improved thermal stability
and tensile strength. Notably
compared with the pristine uncrosslinked CPI
these crosslinked CPI films significantly increase in elongation at break (from 5.4% to 44.2%). Furthermore
the new approach ensures that crosslinked CPIs improve heat resistance and mechanical properties
while avoiding the embrittlement of materials. This study also offeres straightforward preparation methods for optically transparent crosslinked polyimides without additional processing steps. All these results make this approach can effectively improve the competitive performance of the CPI films for potential applications in microelectronic and optoelectronic fields.
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