Synthesis and Properties of Side Chain Azobenzene Liquid Crystalline Polymers

Dan Shu Yao; Jun He; Hai Yan Wang; Mei Tian; Xiao Zhi He; Jian She Hu

doi:10.4028/www.scientific.net/AMR.781-784.436

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 781-784Synthesis and Properties of Side Chain Azobenzene...

Synthesis and Properties of Side Chain Azobenzene Liquid Crystalline Polymers

Abstract:

A series of new azobenzene side chain liquid crystalline polymers were synthesized by two different azo mesogen monomers, 4-((4-(ethoxycarbonyl) phenyl) diazenyl) phenyl 4-(allyloxy) benzoate (M₁) and (4-((4-(ethoxycarbonyl) phenyl) diazenyl) phenoxy) methyl acetyl 4-(allyloxy) benzoate (M₂). All polymers (P₁~P₈) were synthesized by graft polymerization using polymethyl hydrosiloxane as backbone. Their chemical structures were confirmed by FTIR and ¹HNMR spectra. The mesomorphic properties and phase behavior were investigated by differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and thermogravimetric analyzer (TG) measurements. The results showed that P₁~P₈ exhibited thermotropic liquid crystalline properties and revealed nematic thread texture with wide mesophase temperature ranges. The temperatures when 5% weight loss occurred were higher than 305°C, which declared that the synthesized azobenzene liquid crystalline polymers had a high thermal stability.