RADIATION DEGRADATION OF POLYMETHACRYLAMIDE.
Item
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Title
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RADIATION DEGRADATION OF POLYMETHACRYLAMIDE.
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Identifier
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AAI8501162
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identifier
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8501162
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Creator
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O'CONNOR, DANIEL JOSEPH.
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Contributor
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Nan-Loh Yang | Arthur Woodward
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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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The effects of radiation on polymers have been studied for many years. When polymers are subjected to ultraviolet light or ionizing radiation, chain scission and crosslinking are possible.;In the present work the radiation degradations of several methacrylate type polymers were investigated. The primary polymer studied was polymethacrylamide (PMAAm) with the structure shown below:;Ultraviolet irradiated PMAAm yielded a five line ESR spectrum with 22 gauss splitting which is believed to arise from a polymeric radical ending with a methacrylamide unit:;An ESR spin trapping study of irradiated PMAAm with nitroso-t-butane suggested that the polymeric methacrylamide radical and the amide free radical are generated upon irradiation. A mechanism of degradation of PMAAm was proposed. The amide group is cleaved from the polymer backbone in a primary process. The polymer radical produced undergoes beta scission to yield the polymeric methacrylamide radical.;The degradations after exposure to gamma irradiation for PMAAm, a copolymer of methacrylamide (MAAm) with methyl methacrylate (MMA) and poly(isobornyl methacrylate) were also investigated. Molecular weight measurements were used to determine radiation G values in events per 100 eV. The G values found are listed below: (1) PMAAm G(,s)-G(,x) = 2.05; (2) Copolymer (MAAm - MMA) G(,s) = 0.92 G(,x) = 0.09; (3) Poly(isobornyl methacrylate) G(,s)-G(,x) = 2.10.;The results obtained indicate that polymethacrylamide is a polymer which undergoes main chain cleavage upon irradiation. As such this polymer may have potential applicability as a positive resist for fabrication of microelectronic devices.
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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
