Copolymerization studies of trioxane and dioxolane.
Item
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Title
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Copolymerization studies of trioxane and dioxolane.
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Identifier
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AAI9986391
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identifier
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9986391
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Creator
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Werner, Mark D.
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Contributor
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Adviser: Nan Loh Yang
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Date
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1996
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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, Physical
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Abstract
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Polyacetal copolymers are technically important engineering plastics which are competitive with metals, ceramics and nylons in many applications. They are also of fundamental interest since they are the simplest form of polymers with heteroatom, backbone. This work focuses on clarifying some of the fundamental processes which occur during this important copolymerization.;The work is divided into three sections. The first section fully details the NMR experiments that were used to objectively assign the main chain pentads and endgroups. The microstructure of the ethylhydroxy, formate and methoxy endgroups were established.;In the second section NMR assignments made in section one are used to follow the copolymerization in situ through the "precloud period". The pentad profiles demonstrate that transacetalization does not significantly redistribute ethylene oxide units during this period. Experiments using 13C enriched dioxolane helped shed light on the facile exchange of methylene oxide units which occurs throughout the "precloud period".;The third section reports the copolymerization of trioxane with 1,5,7,11-tetraoxaspiro[5,5]undecane. This copolymerization has not been reported previously and introduces a carbonate unit into the copolymer backbone. The copolymer was found to have improved thermal stability relative to trioxane dioxolane copolymer.
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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.
