Abstract
A series of PEPA-TAP-ODA-6FDA branched phenylethynyl-terminated polyimides (BPIs) are successfully synthesized by incorporation of branching units into the linear PI. The molecular structures, thermal and rheological properties of the BPIs are investigated and characterized by FTIR, 1H NMR, elemental analysis, TGA and rheological test. All the BPIs exhibit high transparent in visible region, high solubility, excellent thermal stabilities and melting processability. All the BPIs have excellent thermal stabilities, and the corresponding T5 and heat resistance index values of the BPIs are all higher than 470 and 265 °C, respectively. All the BPIs have a relatively lower melt viscosity values. Compared to that of neat PI, the minimum melt viscosity values of the BPIs are all decreased obviously. Herein, BPIs-b exhibits the minimum melt viscosity (210 Pa•s), far below than that of neat PI (1260 Pa•s).
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Acknowledgments
The authors are grateful for the financial support provided by the National Natural Science Foundation of China (51403175, 81400765 and 51173146); National High Technology Research and Development Program of China (2012AA02A404); Shanxi National Science Foundation (2014JQ6203); Space Supporting Fund from China Aerospace Science and Industry Corporation (2014-HT-XGD) and the Fundamental Research Funds for the Central Universities (3102015ZY066).
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Sun, W., Gu, J., Tian, L. et al. Synthesis and characterization of branched phenylethynyl-terminated polyimides. J Polym Res 22, 85 (2015). https://doi.org/10.1007/s10965-015-0735-1
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DOI: https://doi.org/10.1007/s10965-015-0735-1