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Thermostable birefringent copolyimide films based on azobenzene-containing pyrimidine diamines

Abstract

Azobenzene (azo)-containing polymers have attracted continuous attention due to their excellent photosensitivity. However, practical applications of their photo-induced birefringence have been hampered by low thermal stability. In this work, we report a series of polyimides synthesized by a low-temperature co-polycondensation of azo-containing pyrimidyl diamine, 4,4'-diaminodiphenyl ether, and 4,4'-oxydiphthalic anhydride. The obtained co-polyimides (co-PIs) show good thermal stability, with high glass transition temperatures (Tg) of more than 200 °C and 5% weight loss temperatures (T5%) as high as about 400 °C in nitrogen. Their photo-induced birefringence (Δn) has been determined as 0.013 at room temperature and up to 0.017 at 100 °C. The photo-induced reorientation property of the as-prepared highly thermostable azo-PIs is expected to have wide applications in image recording and electro-optical devices.

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Publication details

The article was received on 02 Jul 2017, accepted on 12 Sep 2017 and first published on 14 Sep 2017


Article type: Paper
DOI: 10.1039/C7TC02958F
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Thermostable birefringent copolyimide films based on azobenzene-containing pyrimidine diamines

    F. Tong, Z. Chen, X. Lu and Q. Lu, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC02958F

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