Photoanisotropy in polarization-sensitive medium developed on the basis of polar water-soluble components

Abstract

In order to obtain a polarization sensitive materials with improved characteristics, there was conducted intensify interaction between the components of recording media through the interaction between the molecular electrostatic forces. For creating materials there were used various organic dyes capable of photochemical geometric isomerization under the influence of actinic polarized light with a wavelength closed to the maximum of the absorption spectrum of each dye. Various polarization sensitive materials have been synthesized based on the polar water-soluble components. Substantial improvement photoanisotropic characteristics of these materials are revealed due to previously added ionizing functional groups in the chromophoric components. It is shown particular exemplary embodiment of synthesis the materials composed of dyes which communicate with certain polymers via dipole-ionic bonds. The research data of medium properties on their base have been brought up for the consideration. In the same way photoanisotropic materials are created on basis of various polar polymer matrixes which separate macromolecules are capable of establishing dipole-dipole bonds with each other. Thanks to this circumstance a supplementary number of polymer fragments which cannot afford direct connection with dye molecules are also able to get drawing into the photoanisotropy inducting processes. It is displayed the influence of such interactions on material kinetics and value of attainable photoanisotropy. A capability of achievement extremely high values of photoanisotropy is produced on the material samples based on the dyes with expanded number of ionized substituent.

Induction of the vector polyphotochromism in side-chain azopolymers

“…It is known that in conventional polarization-sensitive materials photoanisotropy is induced under the action of actinic polarized light. It reaches its maximum and then remains unchanged even after long exposure, remaining at a level of saturation, during which there is the maximum transmission of the probe beam ( Figure 1, curve 1) [4][5][6][7][8][9][10].…”

Photoanisotropy in polarization-sensitive polymer materials based on the media with covalently-bonded components

“…It reaches its maximum and then remains unchanged even after long exposure, remaining at a level of saturation, during which there is the maximum transmission of the probe beam ( Figure 1, curve 1). [4][5][6][7][8][9][10] Unlike this in some high-efficient polarization-sensitive materials obtained by us, we have observed the anomalous kinetics of photoanisotropy induction after reaching its maximum value when material is exposed by actinic linearly polarized radiation and simultaneously is probed by monochromatic nonactinic linearly polarized light beam. [11][12][13] After reaching the maximum the intensity of the transmitted probing beam starts decreasing with radiant exposure of inducing light increasing and almost reaches zero for the given wavelength of the probing beam ( Figure 1, curve 2).…”

Development of high-performance, stable, and moisture-resistant polarization-sensitive materials

“…In order to obtain high-performance and moisture-proof material which also enable store the induced photoanisotropic effects resistant to extreme ambient temperatures, we synthesized a polymer with high glass transition temperature (9) Ph-IzoPh-MCh, and (10) Ph-TerePh-MCh by interfacial polycondensation between phenolphthalein as bisphenol A and dichloranhydride phthalic acid. Ph-IzoPh-MCh (9) Ph-TerePh-MCh (10) The highest thermal stability of polymers is typical for linear and rigid structures of macromolecules in particular synthesized Ph-TerePh-MCh (10). Though in some cases of applications this molecular structure in the photoanisotropic materials the tendency to amorphous loss to form polymer crystallinity was noticed.…”

“…The carboxyl groups definitely hinder the dye solubility in solvents with low polarity and polymers in spite of own polarity, which positively influences the achievable photoanisotropy. 10 Together with the removal of the carboxyl group the two methyl groups were introduced into the basis of the structure of the modified dye molecule which increases the affinity of the dye with lipophilic polymer matrix. On the other hand the methyl groups enable diamine raw material to be apply for dye with more high chemical purity than the aromatic diamine raw without these groups, such as benzidine, which is more susceptible to oxidation than its derivative with methyl groups, such as on-tolidin.…”

“…10 By-turn this decreases the advantage of such materials and in some cases limits the field of their application. The creation of new polarization sensitive media on the basis of the hydrophobic components which does not require an additional protection from moisture is an urgent task.…”