EFFECTS OF DISSOLVED ELASTOMER ON KINETICS OF LOW CONVERSION POLYMERIZATION (MULTICOMPONENT, DIFFUSIONS, GRAFTING, CROSSLINKING, ALLOYS).
Item
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Title
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EFFECTS OF DISSOLVED ELASTOMER ON KINETICS OF LOW CONVERSION POLYMERIZATION (MULTICOMPONENT, DIFFUSIONS, GRAFTING, CROSSLINKING, ALLOYS).
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Identifier
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AAI8508742
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identifier
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8508742
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Creator
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WANIGATUNGA, SIRISOMA.
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Contributor
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George Odian
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Date
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1985
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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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Chain transfer, viscosity and medium effects and polymer-polymer interactions are examined in the low conversion, homogeneous polymerization of styrene with dissolved Cis-1,4-Polyisoprene(PIP). Variation of 1/M(,n) of extracted homopolystyrene with PIP concentration and square root of initiator concentration was used to investigate chain transfer. An experimentally verifiable expression, based on the assumption k(,t) = k(,t(.)0) (gamma)('n)( 1/2-(chi))('m), was used to quantify other polymeric effects. Chain transfer to rubber was absent though it was present with model compounds; Rubber makes the medium a poor solvent and the coiled up polystyrene chains make their radical ends less available for chain transfer. Translational and segmental diffusions, and which of them is controlling in a particular system, depends on the type of polymer and its concentration. Grafting and crosslinking cause segmental diffusions. Chain entanglements are absent; however, polymer-polymer interactions may be present. Expressions derived could be applied, with some modifications, to quantify polymerizations in other multicomponent systems.
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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
