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Study on Synthesis and Properties of Alternating Copolymers Containing Ionic Conductivity

Author: LiuYu
Tutor: LiXiaoYu;WangHaiQiao
School: Beijing University of Chemical Technology
Course: Polymer Chemistry and Physics
Keywords: Synthesis Ion conduction Polyethylene glycol Alternating copolymer Light-emitting electrochemical cell Electroluminescent Photophysical Properties The phase structure
CLC: O631
Type: Master's thesis
Year: 2004
Downloads: 63
Quote: 2
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Abstract


Polymer light-emitting electrochemical cell (LEC) have been available for more than ten years, compared to the LED it has a lot of advantages, but so far has not been a major breakthrough, especially for existing material system, strong pole the ionic conductivity of the polymer and weakly polar conjugate compatibility of the light-emitting segment is not good, so there are some unsatisfactory when used in the preparation LEC. To effectively solve this problem, this paper has designed a series of molecular main chain of alternately key to access different lengths of the ion-conductive segments PEO and fluorescent segment gathered phenylene vinylene (PPV derivative) novel functional emitting polymer; and Qi polyethylene glycol, and as the raw material of p-hydroxybenzaldehyde, using the Wittig and Mitsunobu reaction Synthesis seven alternating polymer, wherein the polymer P4, P5, P6 and P7 are no literature reports of a new polymer. By IR, NMR, elemental analysis, gel permeation chromatography method to clarify the structure of the polymer; through UV - visible absorption spectroscopy, fluorescence spectroscopy, and cyclic voltammetry test was measured by means of which the five kinds of polymers P1 and P2 , P3, P4 and P7 photophysical properties and its electrochemical properties in chloroform solution and solid film. And by differential scanning calorimetry, X-ray diffraction, polarized light, phase contrast microscopy, transmission electron microscopy and atomic force microscope and other instruments for the first time to study the capacity and phase structure of polymer molecules in the crystallization of the PEO segments of different lengths, and systems analysis PEO chain segment length, alkoxy substituted polymer photophysical properties and phase structure. The results showed that: ① The polymer of the ion-conductive segment of PEO increase in length, can improve the dissolution of the polymer properties and processing properties, while improving the quantum efficiency of the polymer can be given LT; WP = 4 GT; polymer excited state relaxation mechanism; ② When the methoxy group is attached to the PPV intermediate on the benzene ring, can not only improve the solubility of the polymer, and also can inhibit the generation of the crystallization of the main chain PEO chains. Push electronic effect ultimately affect the smaller band gap of the polymer, oxidation starter potential significant negative shift occurs, the polymer absorption and emission wavelengths produce a certain degree of redshift. Further, the presence of a methoxy group can significantly improve the quantum efficiency of fluorescence of the polymer. ③ in the light emitting polymer addition of the dissolving ability of the PEO can significantly improve the material of the lithium salt, but will also cause severe phase separation. (4) to design reasonable assembly LEC luminescent materials, should try to avoid the generation of macro-photogenic separation, PEO segments into the polymer main chain but also attention to the selection of a suitable PEO segment length, so as to avoid long PEO chain segment crystallization.

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Polymer physics and physical chemistry of polymers
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