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Journal of Macromolecular Science, Part A
Pure and Applied Chemistry
Volume 55, 2018 - Issue 1
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Original Articles

Synthesis, gas barrier and thermal properties of polyimide containing rigid planar fluorene moieties

Jinghua TanKey Laboratory of Advanced Packaging Materials and Technology of Hunan Province, School of Packaging and Materials Engineering, Department of Polymer Materials and Engineering, Hunan University of Technology, Zhuzhou, Hunan, China
,
Qian WangKey Laboratory of Advanced Packaging Materials and Technology of Hunan Province, School of Packaging and Materials Engineering, Department of Polymer Materials and Engineering, Hunan University of Technology, Zhuzhou, Hunan, China
,
Yiwu LiuKey Laboratory of Advanced Packaging Materials and Technology of Hunan Province, School of Packaging and Materials Engineering, Department of Polymer Materials and Engineering, Hunan University of Technology, Zhuzhou, Hunan, ChinaCorrespondence[email protected]
,
Yi ZengKey Laboratory of Advanced Packaging Materials and Technology of Hunan Province, School of Packaging and Materials Engineering, Department of Polymer Materials and Engineering, Hunan University of Technology, Zhuzhou, Hunan, China
,
Qian DingKey Laboratory of Advanced Packaging Materials and Technology of Hunan Province, School of Packaging and Materials Engineering, Department of Polymer Materials and Engineering, Hunan University of Technology, Zhuzhou, Hunan, China
,
Ruomei WuKey Laboratory of Advanced Packaging Materials and Technology of Hunan Province, School of Packaging and Materials Engineering, Department of Polymer Materials and Engineering, Hunan University of Technology, Zhuzhou, Hunan, China
,
Yuejun LiuKey Laboratory of Advanced Packaging Materials and Technology of Hunan Province, School of Packaging and Materials Engineering, Department of Polymer Materials and Engineering, Hunan University of Technology, Zhuzhou, Hunan, China
&
Xianwei XiangKey Laboratory of Advanced Packaging Materials and Technology of Hunan Province, School of Packaging and Materials Engineering, Department of Polymer Materials and Engineering, Hunan University of Technology, Zhuzhou, Hunan, China
 show all
Pages 75-84 | Received 06 Apr 2017, Accepted 29 Sep 2017, Published online: 06 Dec 2017
 
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ABSTRACT

In order to obtain pristine polyimides with high barrier properties, pyromellitic dianhydride (PMDA) and 9H-fluorene-2,7-diamine (FDA) containing rigid planar fluorene moieties were used to prepare polyimide (FPI) via a conventional two-step polymerization process in this paper. The synthesized polyimide shows good barrier properties, with oxygen transmission rate (OTR) and water vapor transmission rate (WVTR) low to 1.01 cm3 m−2 day−1 and 2.35 g m−2 day−1, respectively. The effect of rigid planar structure in main chain on the barrier properties of polyimide was studied by means of wide angle X-ray diffractograms (WAXD), molecular dynamics simulations and positron annihilation lifetime spectroscopy (PALS), which was rarely reported before. The results reveal that the good barrier properties of FPI are mainly due to the high crystallinity, high chain rigidity and low free volume, which are resulted from the rigid planar structure. Additionally, the polyimide exhibits excellent thermal and dimensional stability with 5 wt% loss temperature of 519°C, glass transition temperature of 370°C and coefficient of thermal expansion (CTE) of 5.72 ppm/K. The good gas barrier and thermostability endow the polyimide with promising potential in flexible electronics encapsulation applications.

Acknowledgements

The authors would like to thank Prof. Zhiquan Chen from Hubei Nuclear Solid Physics Key Laboratory, Department of Physics, Wuhan University for their help in the measurement of the polymer free volume.

Funding

The authors acknowledge the financial support by the National Natural Science Foundation of China (No. 51603066, 51703058), NSAF (U1730142), the China Postdoctoral Science Foundation (No. 2015M580692), the Science Research Project of Hunan Provincial Department of Education (No. 16B068, 17K028), the Research Funds for Key Laboratory of Functional and High Performance Polymeric Materials of Guangdong Province (No. 20151004), the Science and Technology Project of Zhuzhou City, and the Natural Science Foundation of Hunan Province (No. 2017JJ3055, 2015JJ6034).

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