Study On Preparation, Structure And Properties Of Main-Chain Azo Polymer

Azo polymers have not only optical activity of azobenzene ,but also good processability and mechanical properties of polymers. They are widely used in many fields such as, optical information storage materials, nonlinear optical materials, liquid crystal materials, light adjust and control materials of biological activity and nanophase materials. The developing trend of synthesis and application of azo compounds and polymers has been reviewed in this paper. Study on main-chain azo polymers was investigated in optical information storage materials, light adjust and control materials of biological activity, photochromism materials .The synthetic technique, structure and properties of main-chain azo polyamides , main-chain azo polyacylsemicarbazides and polycarbonate with azobenzene(PC-Azo) were studied systemically. The main results obtained can be summarized as follow:(1) Using p-nitrobenzoic acid , m-nitrobenzoic acid, 3-methyl-4-nitrobenzoic acid, 2-chloro-4-nitrobenzoic acid as materials , glucose as reductant and thionyl chloride as acylating agent, four azobenzene -dicarbonylic chlorides were synthesized. Using sodium borohydride as reductant and dimethyl sulfoxide as solvent, 3,3'-azobis(benzoylhydrazide) was synthesized from m-nitrobenzoylhydrazide via reduction.(2) The structures of four azobenzene-dicarbonylic chlorides and 3,3'-azobis(benzoylhydrazide) were confirmed by IR, ¹HNMR and elemental analysis. 3,3'-dimethy-azobenzene-4,4'-dicarbonylchloride and 3,3'-azobis(benzoylhydrazide) were synthesized in the first time.(3) Four main-chain azo polyamides containing ether and sulfone group were synthesized from bis[4-(4-aminophenoxy)phenyl sulfone] and four azobenzene -dicarbonylic chlorides by low-temperature-solution condensation polymerization. The optimum conditions of condensation polymerization were obtained. Inherent Viscosity of four main-chain azo polyamides containing ether and sulfone group is from 0.82-1.12(dl.g^-1).(4) The structures of four main-chain azo polyamides containing ether and sulfone group were confirmed by IR, ¹HNMR and elemental analysis. Incorporation...