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Design, Synthesis and Structural Characterization of Novel Hyperbranched Poly(Phenylene Vinylene)

Author: SuJinJin
Tutor: LiShengBiao
School: Central China Normal University
Course: Pesticides
Keywords: Polystyrene support Hyperbranched conjugated polymers Luminescent materials Synthesis
CLC: O631.3
Type: Master's thesis
Year: 2009
Downloads: 26
Quote: 0
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Abstract


Scholars from various countries polyphenylene ethylene derivatives (PPVs) material early as the beginning of the study, its funding, currently it has become a class of polymer has good commercial prospects electric luminescent material. Polyphenylene ethylene still exists some defects, when the relatively large molecular weight of PPV, the solubility in an organic solvent may deteriorate, and prone to interaction between the chains, resulting in fluorescence quenching phenomenon is serious. There are two methods: one of its structural modification introduced in the structure and increase the solubility of the group. Second, the introduction of a large volume of the group or the like, such as hyperbranched structure forming the twisted structure of the non-coplanar. The objective of this paper is the design, synthesis and properties of organic light emitting material of the ethylene-based polymer explore novel polyphenylene soluble having a hyperbranched structure stays. The specific contents are as follows: 1. To mean three-benzyl bromide and 2 - methoxy -5 - (2'-ethyl-hexyloxy) -1,4 - dichloro-methylbenzene as monomers to 1:1.5, ratio of 1:4 and 1:9 for feeding Gilch reaction generates red polymer P 1 -P 3 , synthetic polymers in common solvents such as chloroform good solubility P 1 P 2 and the P 3 chloroform solution maximum UV absorption wavelength of 503,493 and 490nm, maximum fluorescence emission wavelength of 567nm, solid-state maximum UV absorption wavelength than liquid for redshift 38,29.5 and 27nm P 1 P 2 and P 3 < / sub> solid state thin film fluorescence emission wavelengths, respectively, than the liquid of the redshift 35,29, and 29nm. Polymer P 1 P 2 and P , began a large number of decomposition temperature of 375, 377 and 382 ° C, respectively. 2 1,3,5 - (tribromide triphenylphosphonium methylene) benzene and 2 - methoxy -5 - (2'-ethyl-hexyloxy) -1,4 - dialdehyde benzene aldehyde group-containing polymer through the end of the synthesis of the Wittig reaction as monomers, P4, with the polymer P 1 the structure has certain similar but due to the synthetic methods and the different monomers, and their molecular weight differences respectively 1.75 × 10 6 and 5.22 × 10 4 , and polymer P 1 both in the solid film or liquid state whether the maximum UV absorption wavelength or fluorescence emission wavelength than polymer P 4 redshift. Polymer P 1 and P , 4 decomposed temperature of 375 ° C and 373 ° C. 1,3,5 - (triphenylmethyl scales tribromide methylene) benzene and 1,4 - bis (5'-aldehyde thiophene thienyl -2 ') -2,5 - dioctyl oxybenzene for the monomer synthesis of the end of a main chain containing a benzene ring and thiophene aldehyde group-containing the broad absorption brown polymer P 5 , to a Wittig reaction. In the solid state of the film polymer P 5 absorption range of 375-550nm, the solid fluorescence emission wavelength of 560-620nm. Compared with the solid film in a solution state absorption range is narrow, the strongest absorption at 440nm, the fluorescence emission wavelength of 500-540nm. The polymer P 5 initial decomposition temperature of 369 ° C. The the The synthetic polymer P 1 -P 5 UV absorption, fluorescence emission, GPC, electrochemical, thermal gravimetric analysis, DSC, NMR, powder diffraction test, indicating that the Design and Synthesis of polymer P 1 -P 5 have good solubility in common solvents such as chloroform, and both have good thermal stability. Polymer P 1 -P 5 is likely to become a good performance of the electroluminescent material. Synthetic polymers in the organic light emitting device and a solar cell applications are for further study. No Chinese summary content

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