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Title: Synthesis of poly(phenylene vinylene)s for light-emitting devices
Author: Chuah, B. S.
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 1999
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Electroactive polymers have been the subject of academic and industrial interest for many years. This research encompasses the synthesis and characterisation of semi-conducting polymers for light-emitting display applications. The concept of polymer electrolytes in such displays is discussed in the second part of this research. One of the objectives of this research was to synthesise novel derivatives based on the poly(1,4-phenylene vinylene) (PPV) backbone with an unconventional 2,3-disubstitution pattern on the phenylene ring. These polymers were synthesised using different methods of polymerisation, namely the Gilch dehydrohalogenation route and the Witting-Horner-Emmons polycondensation route. This class of polymers was found to be significantly blue-shifted to give yellow-green emission compared with their 2,5-dialkoxy-substituted counterparts which emit in the orange-red region. Model oligomeric compounds were also synthesised to explain the interesting behaviour of this class of polymers by use of single-crystal X-ray crystallography studies and semi-empirical calculations. Early investigations into the potential synthesis of copolymers of the same dialkoxy-substitution pattern using palladium-catalysed Heck coupling polymerisations is also briefly reported. This interest then extended to the effect of the substitution pattern on cyano-substituted PPV derivatives and comparisons were made with the well-established 2,5-disubstituted-cyano-PPV group of polymers. The second aim of this research was to investigate the viability of incorporating functional ion-transporting side chains directly onto the emissive polymer backbone of PPV derivatives. This then eliminates the need for polymeric blends with a second ion-transporting polymer such as PEO in light-emitting electrochemical cells (LECs). Investigations using oligo(ethylene oxide) as side chains provided promising results, indicating that ion-supporting side chains incorporated onto the emissive backbone are indeed effective. This then led to further investigations with possible ion-supporting crown ethers as the substituent group on the phenylene ring of the emissive PPV polymers.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available