Citation: Wei Chen, Mian Ji, Shi-yong Yang. High Thermal Stable Polyimide Resins Derived from Phenylethynylendcapped Fluorenyl Oligoimides with Low Melt Viscosities[J]. Chinese Journal of Polymer Science, ;2016, 34(8): 933-948. doi: 10.1007/s10118-016-1813-5 shu

High Thermal Stable Polyimide Resins Derived from Phenylethynylendcapped Fluorenyl Oligoimides with Low Melt Viscosities

Wei Chen ^a,b ,
Mian Ji ^a ,
Shi-yong Yang ^a,,

a.
Laboratory of Advanced Polymer Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
b.
University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: Shi-yong Yang, shiyang@iccas.ac.cn
Received Date: 7 February 2016
Revised Date: 3 April 2016
Accepted Date: 6 April 2016

Fund Project: This work was financially supported by the National Basic Research Program of China 2014CB643604

To improve the processability and thermal stability of polyimide, a series of novel phenylethynyl-endcapped oligoimides (PEPA-oligoimides) with calculated molecular weights (M_nC) were successfully prepared from thermal imidization of 4, 4'-(9-fluorenylidene) dianiline (BAFL) as fluorenyl diamine, 4, 4'-oxy-diphthalic anhydride (ODPA) as aromatic dianhydride and 4-phenylethynylphthalic anhydride (4-PEPA) acted as reactive end-capping reagent at elevated temperatures. Experiment results indicated that the oligoimides were the mixtures of PEPA-endcapped oligomers with different degrees of polymerization characterized by MALDI-TOF mass spectra. The influence of chemical structures on the melt processabilities of the oligoimides, the thermal, dielectric and mechanical properties of the thermoset resins was studied. The typical oligoimide resin owned minimum melt viscosity of 0.2 Pa·s at around 310℃ and wide melting processing window, suitable for resin transfer molding (RTM). Besides, its corresponding thermal-cured polyimide resin possessed glass transition temperature (T_g) as high as 514℃. The dielectric constants of polyimide resins decreased from 3.15 to 2.80 by reducing the M_nC. The mechanical properties of the polyimide neat resins were improved gradually with increasing M_nC. Finally, the carbon fiber/polyimide (C_f/PI) composite laminates showed excellent mechanical strength retention rate at 350℃, might be long-term served at extremely high temperature in aerospace and aviation field.
- Polyimide,
- Fluorene,
- Proccessability,
- Thermal stability,
- Composite
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