Thermotropic poly(azomethine-urethane)s with non linear optical properties: Synthesis and characterization

Abstract

Two series of the thermotropic main chain poly(azomethine-urethane)s were synthesized by the polyaddition of azadiol, 1,8 octandiol with methylene bis(phenyl isocyanate) (MDI) and tolylene 2,4 diiso cyanate (TDI) respectively. The mesomorphic properties and phase transition temperature of the polymers were characterized by differential scanning calorimetry and hot stage polarizing microscopy. These polymers showed nematic messophase. The non linear optical (NLO) activity of the polymers was also investigated.

Photophysical, Electrochemical, Thermal and Morphological Properties of Polyurethanes Containing Azomethine Bonding

“…Moreover, various derivatives of PAMs, such as poly(azomethine-ether)s (16), poly(azomethinesulfone)s (17) and poly(azomethine-ester)s (18), have been synthesized and reported in the literature. Polyurethane containing azomethine, which are also known as poly(azomethine-urethane)s, have also been reported in the literature (19,20), and their thermal stability (21), semicrystalline behavior (22), non-linear optical (23) and electrochemical properties (24), solar cell (25) and ion sensor applications (26,27) have been clarified. To the best of our knowledge, there is not too much paper in the literature on polyurethanes containing azomethine.…”

Studies on Thermal and Photoisomerization Properties of Polyesters Possessing Azomethine Moieties in the Back Bone

“…These limitations frequently limit their use in a variety of applications. Along with its intriguing qualities including syn-anti isomerism [4], excellent heat stability [5], optical activity [6], liquid crystallinity [7], and dielectric properties [8] the existence of azomethine linkage in the polymer is of specific interest.…”

Synthesis of Novel crosslinked Poly(azomethine-urethane)s: Photophysical and thermal properties

“…The most appropriate method to increase their thermal stability is structural modification via copolymerization with more thermally stable polymers like polyurea, polyazomethine, and polyimide [22e25]. Poly(azomethine-urethane)s (PAMUs) with high thermal stabilities [26] have been investigated in terms of morphological characteristics [27], semi crystalline behavior [28], optical properties [29], and ion sensing applications [30]. According to these studies, many features of PAMUs have been affected by chemical modifications.…”