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With polar side groups polyparaphenylene benzoxazole synthesis and characterization

Author: ShiHongWei
Tutor: ZhengShiJun；MaoLuYuan
School: Zhengzhou University
Course: Polymer Chemistry and Physics
Keywords: Polyphenylene benzoxazole Soluble fusible Fluorescent material Concentration quenching effect
CLC: O633.5
Type: Master's thesis
Year: 2007
Downloads: 88
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Abstract


In order to improve polyparaphenylene benzoxazole (PBO), was dissolved melting properties, to study their optical properties, was designed and synthesized with a strongly polar group of the chlorine and fluorine atoms in the two side groups Element polyparaphenylene benzoxazine the azole polymer PBTCO and PBTFO. First, the design and synthesis of 4,6 - diamino the dihydrochloride (DADHB) required for the polymerization of the three monomers, 4 - chloro - phenyl - diindolo - terephthalic acid (TCTA) and 4 - fluoro - phenyl - diindolo - condensation polymerization of terephthalic acid (TFTA), the three polymer of PBO, PBTCO and PBTFO. Monomer by FT-IR, the 1 HNMR and 13 3 CNMR determine the structure, and the polymers were determined by FT-IR. Secondly, the fully processed on PBTCO and PBTFO to found PBTCO and PBTFO can be partially dissolved in DMF, and to improve the mechanical polyparaphenylene benzoxazole-based polymer in the solubility in common solvents. Polymer can be dissolved in DMF PBTCOD, and PBTFOD and do not dissolve DMF polymer PBTCOM and the PBTFOM characterized. The DSC PBTCOD and PBTFOD diagram melting peak appears to the PBTCOD and PBTFOD molten at this temperature was observed through a polarizing microscope, after entering the liquid crystal state, and the photo birefringence of the liquid crystal state. A viscosity method Determination of PBTCOM and PBTFOM MW, the result showed that the the are the obtained PBTCOM and PBTFOM has a larger molecular weight, to meet the requirements of the application of the material. In through to the GPC measurement PBTCOD and PBTFOD MW, they have a large molecular weight and a narrow molecular weight distribution. Thermal analysis showed 5% weight loss temperature than PBO has decreased to some extent, but still above 300 ℃, to meet the requirements as a general photovoltaic materials. Finally, the study of the optical properties of the polymer synthesized. Measured to got PBTCOD and PBTFOD quantum efficiency of 0.51 and 0.18 respectively. At the same concentration, PBTCOM PBTFOM compared with PBO, the fluorescence emission intensity increased significantly, but still there is a strong concentration of quenching effect. Compared with PBTCOD, PBTFOD the concentration quenching effect was significantly reduced. With the increase of the concentration, caused due to the state of aggregation redshift peak enhancement, PBTFOD fluorescence of the solution changes from blue to nearly white. The solid film also displays a width of nearly white light emission peak, indicating PBTFOD application is expected to be obtained in the illumination field of light emitting material.

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Miscellaneous Chain Polymers > Heterocyclic polymer chain (chain polymer containing heterocyclic )
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