synthesis of acyclic polyimides

S Y N T H E S I S OF A C Y C L I C P O L Y I M I D E S

V . V . K o r s h a k , S . V . V t n o g r a d o v a , V . A . V a s n e v , a n d E . L . B a r a n o v

UDC 542.91+541,64+547.398.1

We have p repared acyclic polyimides for the f i rs t time, the synthetic p rocess of which can be r e - p resen ted by the following scheme:

CIC--R--CCI -~- HN (R')C--R--CN (W)I{ 2n,x i! [I u 'l - - 2 R 3 N . I I C I o o 6 o

. . . . C--R--C--N--C--R--C--N . . . . I! !' I I !1 I o o R 'O OR'

CIC--R -CC1- u C6}I~NI{~ 2R,N ~.. .--C--R--C--N . . . . , :1 li --2R,.','.HCl il !1 I 0 0 0 0 C~I]~

2---% 2--% - ,~ . /_ \ c/_Xo=,,,-, R'=cou~-; . c ~ m ~ -

R = - - ~ - ; ( - - I F'>-c=o % /

The polyimides were obtained by addition of the diacid chloride to a solution of diamide (0.1-0.2 mole / l i te r ) and tr tethylamine in nitrobenzene at 50~ and the polycondensation was continued for 2 h. Dimethylacetamide, acetone, and cyclohexanone were used as other solvents. Polytmides were obtained in a yield of 25-60% of theor, as a resul t of the experiments; reduced viscosi t ies of 0.5% solutions of the po lymers in te t rachloroethane at 25~ were found to be in the region of 0.08-0.14 dl/g.

All of the synthesized polyimides dissolved in various organic solvents and melted in the interval of 175-220~ Tempera tu res of s tar t of decomposition of the polymers in argon lie in the region of 35WC.

Institute of I teteroorganic Compounds, Academy of Sciences of the USSR. Transla ted f rom Izvest iya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 6, p. 1402, June, 1969. Original letter submitted March 14, 1969.

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