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SYNTHESIS AND CHARACTERIZATION OF COMB-LIKE POLYMERS BEARING heterocyclic azo group AND MESOGENIC group

Chinese Journal of Polymer Science 1999年第1期17卷 57-63页

作者：黄文强 The State Key Laboratory of Functional Polymer Materials for Adsorption and Separation Institute of Polymer Chemistry Nankai University Tianjin 300071 China

The synthesis and characterization of a series of novel comb-like polymethacrylates bearing heterocyclic azo group and mesogenic group are described. The thermal properties of the polymers such as thermal stability and phase transition behavior were investigated by thermogravimetric analysis, differential thermal analysis and polarizing optical microscopy techniques. The experimental results show that all the synthesized polymers do not exhibit liquid crystallinity except the homopolymer of the mesogenic monomer MAPB2 and the glass transition temperatures of the polymers increase with increasing content of azo moiety in polymers linearly.

关键词： comb-like polymers heterocyclic azo group mesogenic group

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SYNTHESIS AND CHARACTERIZATI0N OF POLYMETHACRYLATES BEARING heterocyclic azo group AND MESOGENIC group FOR NONLINEAR OPTICS

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Chinese Journal of Polymer Science 1998年第1期16卷 38-47页

作者：张会旗李晨曦黄文强印寿根吴强宋正纪何炳林 The State Key Laboratory of Functional Polymer Materials for Adsorption and Separation Institute of Polymer Chemistry Nankai University Tianjin 300071 China Department of Applied Chemistry Tianjin University Tianjin 300072 China Department of Applied Chemistry Tianjin University Tianjin 300072 China The State Key Laboratory of Functional Polymer Materials for Adsorption and Separation Institute of Polymer Chemistry Nankai University Tianjin 300071 China

The methacrylate monomers bearing mesogenic group and heterocyclicazo dye have been synthesized. The monomeric dye was copolymerized with the mesogenicmonomer using a free radical initiator to produce polymers useful for nonlinear optics. Themonomers and polymers were characterized by IR,;H-NMR, and UV-Vis spectra. Theaverage molecular weight （M;and M;） of the polymers were determined by gel permeationchromatography. The thermal properties of the polymers such as thermal stability andphase transition behavior were studied by thermogravimetric analysis, differential thermalanalysis, polarizing optical microscope and X-ray diffractometer. The results demonstratethat the synthesized polymers are crystalline polymers at room temperature and no liquidcrystalline phases were observed for all of them.

关键词： heterocyclic azo group Mesogenic group Nonlinear optics Liquid crystalline polymers Crystalline polymers Polymethacrylate

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