This paper reports novel photoresponsive, processable poly(esterimide)s functionalized with the azobenzene and tricyanovinylene groups. Post and prepolymerization strategies were utilized for preparation of the new photochromic polymers with imide rings. The postpolymerization method of azopolymer synthesis included a functionalization of precursor poly(esterimide) containing dialkylaminophenyl groups with diazonium salt of aniline. The precursor poly(esterimide) was obtained from synthe-

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In this paper, novel poly(esterimide)s with attached as a side group azobenzene chromophores are presented. The polymers differing in substituents on the azobenzene moieties and chromophore concentration. Azopolymers were obtained by a twostep synthetic approach. This include the preparation of a precursor poly(esterimide) with benzene moiety pendant from main chains, followed by the covalent bonding of the NLO chromophores onto the polyimide backbone by a post-azo-coupling reaction using the following coupling components: p-nitroaniline, 2-cyan-4-nitroanilin, 2,4-dinitroaniline and Disperse Orange 3. The precursor poly(esterimide) was obtained from synthesized 2,2 0 [N-phenylethyloaniline-di(4-estro-1,2-dicarboxylic)]anhydride and 4,4 0 -methylene bis(2,6-dimethylaniline). The degree of functionalization of the poly(esterimide)s was estimated by UV-vis spectroscopy. The obtained polymers were characterized and evaluated by FT-IR, 1 H NMR, X-ray, UV-vis, DSC and TGA. The results showed the azopolymers exhibited high glass transition temperatures (T g ¼ 159{224 C), high thermal stability with decomposition temperatures in the range of 311-334 C and good solubilities in common organic solvents. First time two-photon absorption (TPA) coefficient in cast films of amorphous azopoly(esterimide)s was measured using Z-scan experiment which was performed with femtosecond laser pulses 100 fs at 800 nm. The TPA coefficient was determined to be in the range of 1.54-11.69 cm/GW.

The spacings of t h e smectic layers are compared with t h e lengths of molecules of p-substituted phenyl 4-(trans-4'-n-decylcyclohexyl) benzoattes. It has been found t h a t if the NO,, CN or CHO groups are substituted in the p-position of t h e phenyl, then t h e smectic layers consist of dimers, whereas in the presence of the NCS, COCH,, T, C1, Br, F substituents the srnectic layers reveal a monomolecular spacing.Die nicken der smektischen Schichten wurden mit der Molekulliinge von 4-(trans-4'n-llecylcyclohexyl) benzoaten dem p-substituierten Phenyl verglichen. Es wurde festgestellt, da13, wenn als p-Substituent im Phenyl eine der folgenden Gruppen NO,, CN, COH vorliegt, sich die smektischen Schichten aus Dimeren zusammensetzen, dagegen sind in Anwesenheit von den Substituenten NCS, COCH,, J, CI, Br, F die smektischen Schichten an GroRe dem einzelnen Molekul gleich. __

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