Abstract
Recently, soluble poly(azomethine ester)s with good thermal stability and liquid crystalline properties are much sought after in opto-electronic field. One such attempt was to synthesize poly(azomethine ester)s with a pendent group. In this study, the newly synthesized diacid monomer benzalaniline 3’-4’dimethoxy terepthalic acid was condensed with two diol monomers to get the polymers with pendent benzylidene group. The diacid monomer was characterized by UV, IR, NMR and CHNS analysis. The polymers were characterized by IR, TGA, and for liquid crystalline property. Polymer-I showed the highest thermal stability upto 335°C. Polymer-II exhibited liquid crystalline nature along with good solubility and thermal stability.
Highlights
Aromatic polymers containing both ester and azomethine units are a type of high-performance polymers with excellent thermal, physical and mechanical properties and are utilized in various fields such as electric, electronic, photonics and in industrial material field [1,2,3,4,5,6]
We report the preparation and characterization of two polymers with a pendent dimethoxy benzylidene group—one having notable number of aromatic rings, azomethine and an oxygen atom in the back-bone and the other with less number of aromatic rings and methylene spacer in the main chain
The polymers were synthesized by phosphorylation method using dichloro phenyl phosphine/pyridine and LiCl dissolved in DMFas solvent
Summary
Aromatic polymers containing both ester and azomethine units are a type of high-performance polymers with excellent thermal, physical and mechanical properties and are utilized in various fields such as electric, electronic, photonics and in industrial material field [1,2,3,4,5,6]. Poly(azomethine) with oxygen atom in the backbone was found to be more amorphous and more luminescent properties [8]. Their poor solubility in organic solvents often restricts its use for many applications. It has been reported that the presence of oxygen atom contributes to increase in the basicity of the schiff base nitrogen atom in the polymer, resulting in the stronger interaction to the acid and increasing the solubility of poly(azomethine) [27]. We report the preparation and characterization of two polymers with a pendent dimethoxy benzylidene group—one having notable number of aromatic rings, azomethine and an oxygen atom in the back-bone and the other with less number of aromatic rings and methylene spacer in the main chain. The polymers were synthesized by phosphorylation method using dichloro phenyl phosphine/pyridine and LiCl dissolved in DMFas solvent
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