CONJUGATED POLYMERIC SYSTEMS.
Item
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Title
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CONJUGATED POLYMERIC SYSTEMS.
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Identifier
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AAI8501164
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identifier
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8501164
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Creator
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PEMAWANSA, KARIYAWASAM PATUWATA WITHANAGE.
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Contributor
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Nan-Loh Yan | George Odian
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Date
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1984
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Language
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English
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Publisher
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City University of New York.
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Subject
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Chemistry, Polymer
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Abstract
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A series of polymers containing modified polyphenylene structures have been synthesized by aromatic nuclear coupling of conjugated monomers with terminal aromatic groups and oxidative coupling of aromatic monomers with terminal acetylene groups. The monomers were cis- and trans-stilbene, diphenyl acetylene, 1,4-diphenyl-1,3-butadiyne and 4,4'-diethynylbiphenyl. The mechanism of aromatic nuclear coupling polymerization of cis- and trans-stilbene is probably radical cationic. Polymer structures were characterized by ('1)H and ('13)C NMR, IR, ESR, VPO and chemical methods. Results of such experiments revealed that aromatic nuclear coupling is a facile route to modified polyphenylenes. However, this reaction could be complicated if the monomer has triple bonds or double bonds attached to its phenyl groups. The electrical and thermal properties of these polymers were studied and correlated with their structures to obtain structure-property relationships. The results showed that tractability and electrical conductivity are not mutually exclusive for these polymers. Higher ionization potential, non-planar structures and cumulated double bonds presented barriers for the electrical conductivity of these doped polymers. The results of the thermal property studies showed that the flexibility of the backbone, large pendant groups and non-planar or non-linear structures could lower the thermal stability of a conjugated polymer remarkably.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
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Program
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Chemistry
