Soluble polyimides with trifluoromethyl pendent groups

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Unsymmetrical and symmetrical diamine monomers containing trifluoromethyl groups, 2-trifluoro methyl-4,4'-diaminodiphenyl sulfide and 2,2'-bis(trifluoromethyl)-4,4'-diamino-diphenyl sulfide, were synthesized from 2-chloro-5-nitrobenzotrifluoride as a starting material in two steps, respectively. Diamine monomers were polymerized with PMDA, BPDA, BTDA, and ODPA using a solution imidization method with N-methyl-2-pyrrolidone as a solvent at 190 degrees C to obtain the corresponding polyimides. They had inherent viscosities that ranged from 0.54 to 0.71 dL/g in N-methyl-2-pyrrolidone at 30 C. All of the synthesized polyimides showed good solubility in polar aprotic solvents and phenolic solvents regardless of the number of trifluoromethyl groups. The 5% weight loss temperatures of the polyimides are in the range of 534-561 degrees C in nitrogen, and 505-542 C in air. The Tg values and the thermal expansion coefficients of these polymers are in the range of 234-325 degrees C and in the range of 47.4 63.2 ppm/degrees C, respectively. Also, all of the synthesized polyimides have relatively low refractive indices (around 1.6) and birefringence (below 0.36). Published by Elsevier Ltd.
Publisher
ELSEVIER SCI LTD
Issue Date
2013-10
Language
English
Article Type
Article
Keywords

AROMATIC-SUBSTITUTION REACTION; NITRO DISPLACEMENT REACTION; POLY(BIPHENYLENE OXIDE)S; UNSYMMETRICAL DIAMINE; FLUORINATED POLYIMIDES; RELATIVE PERMITTIVITY; POLY(ARYLENE ETHER)S; REFRACTIVE-INDEXES; CYANO GROUPS; FREE-VOLUME

Citation

POLYMER, v.54, no.21, pp.5648 - 5654

ISSN
0032-3861
DOI
10.1016/j.polymer.2013.08.057
URI
http://hdl.handle.net/10203/187407
Appears in Collection
CH-Journal Papers(저널논문)
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