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Title 

Soluble polyimides from unsymmetrical diamine containing benzimidazole ring and trifluoromethyl pendent group

Authors 

H ChoiIm Sik ChungK HongC E ParkS Y Kim

Publisher 

Elsevier

Issue Date 

2008

Citation 

Polymer, vol. 49, no. 11, pp. 2644-2649

Keywords 

benzimidazole ringsoluble polyimidestrifluoromethyl pendent group

Abstract 

New unsymmetrical diamine monomer containing both the benzimidazole ring and trifluoromethyl group, 6,4′-diamino-2′-trifluoromethyl-2-phenylbenzimidazole, was prepared from 2-bromo-5-nitrobenzotrifluoride and 4-nitro-1,2-phenylenediamine. The monomer was polymerized with ODPA, BTDA and 6FDA by using one-pot synthetic method to obtain corresponding polyimides. All the prepared polyimides were soluble in aprotic polar solvents. Incorporation of trifluoromethyl groups unsymmetrically in the rigid polyimides improves their solubility without decreasing their physical properties. The polymers showed high glass transition temperature (Tg = 289-352 °C), high thermal stability (Td10 > 500 °C), and relatively low coefficient of thermal expansion (CTE = 26.1-46.4 ppm/°C) because of their rigid-rod like structure. Also, they showed low refractive indexes (n = 1.46-1.68) and low birefringence (Δ ? 0.02) due to the trifluoromethyl pendent groups that interrupt chain packing and increase free volume.

ISSN 

0032-3861

Link 

http://dx.doi.org/10.1016/j.polymer.2008.04.019

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2017-04-19


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