Photoinduced Holographic Gratings in Azobenzene-Functionalized Poly(amideimide)s

Abstract

ABSTRACT:We present the diffraction grating recording in a series of poly(amideimide)s functionalized with methyl-substituted azobenzene chromophore as side group and correlate the results with the molecular structure. Poly-(amideimide)s, differing in their backbone structure and in position in which azobenzene group is attached to polymer chain, were synthesized and characterized by the spectroscopic methods. Diffraction gratings were fabricated using degenerate two-wave mixing technique with cw Ar þ laser working at ! ¼ 514:5 nm and monitored by light diffraction of low power He-Ne probe beam ! ¼ 632:8 nm in a transmission mode. Two qualitatively different configurations of the recording beam polarizations were used s-s and s-p. The dynamics of diffraction grating inscription was described by mono-or biexponential growth functions. The surface relief grating formation was also examined in poly(amideimide)s. They were studied by atomic force microscope and revealed the strong dependence on the writing beams polarization. Additionally the thermal stability of the photoinduced surface gratings was checked.

Photochromic supramolecular azopolyimides based on hydrogen bonds

“…This work is a part of our ongoing effort in developing new photochromic polymers with imide rings containing azo-based chromophores [29][30][31][32][33][34][35]48]. In the present study new supramolecular azopolyimides were papered using azochromophores from Azo-1 to Azo-4 and polymers with imides units PETIs and PESIs, which chemical structures are shown in Fig.…”

“…The one of the ways to overcome mentioned above problems is the attaching chromophores covalently to the polymer chains. Such functionalized polymers, in which chromospheres are covalently attached, have already been widely investigated in the literature [6,28] as well as in our researcher group [29][30][31][32][33][34][35][36][37][38]. The drawback of these systems is the fact that for each combination of a polymer and an active molecule an organic synthesis is required which makes the sample preparation slower and more expensive.…”

“…To the best of our knowledge, the idea of the preparation of the supramolecular systems based on polyimides and azochromophore supramolecular azopolymers, based on H-bonds between the and the polyimides as a matrix, was for the first time applied in our previous work [48]. Polyimides (PIs) represent an important class of high-performance polymers which can be useful in a variety of applications [49] and are investigated as potential materials in the fields of optoelectronics and photonics [29][30][31][32][33][34][35][50][51][52][53]. In previous work we described the holographic diffraction grating formation in the supramolecular films built on the basis of the hydrogen bonds between the hydroxyl or carboxylic groups of poly(esterimide)s (PESIs) and poly(etherimide)s (PETIs) and azocompounds, that is, 4-[4-(3-hydroxypropyloxy)phenylazo]pyridine and 4-[4-(6-hydroxyhexyloxy)phenylazo]pyridine [48].…”

On the long time holographic grating recording process in azo-polymer

“…[1][2][3][4][5][6][7][8] The interest of the topic results from observation of the light-induced mass transport and surface relief gratings ͑SRGs͒ formation [1][2][3][4][5][7][8][9][10][11][12] and possible application of this phenomenon especially in photonics. 3,9,10,[13][14][15][16][17][18][19][20] Many papers were devoted to SRGs characterization, [1][2][3][4]9,11,12 mechanisms of the SRGs formation, 3,9,11,12 and potential application of SRGs, 3,9,10,[13][14][15][16][17][18]…”

“…The degenerate two-wave mixing technique was used in the grating writing. 5,6,24 Experimental conditions were as follows:…”