Poly(acrylonitrile-co-methyl acrylate) copolymers: Correlation between copolymer composition, morphology and positron annihilation lifetime parameters

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dc.contributor.authorZengeni E.
dc.contributor.authorHartmann P.C.
dc.contributor.authorSanderson R.D.
dc.contributor.authorMallon P.E.
dc.date.accessioned2011-05-15T15:59:25Z
dc.date.available2011-05-15T15:59:25Z
dc.date.issued2011
dc.description.abstractA series of poly(acrylonitrile-co-methyl acrylate) copolymers of differing copolymer compositions are synthesized through free radical emulsion copolymerisation of methyl acrylate (MA) and acrylonitrile (AN) and by variation of the monomer feed ratios. The copolymers are characterized by NMR, SEC, WAXD, DMA, and positron annihilation lifetime spectroscopy. Results show that, there is a linear decrease in the glass transition temperature (Tg) of the copolymers and the MA content. There is also a progressive decrease in the crystallinity of the copolymers with increasing MA content. Positron results show a sigmoidal variation in the ortho positronium lifetime with an increasing MA content. The low MA content, semi-crystalline copolymers show a positive deviation from the linear additive relationship between the o-Ps lifetime and MA content, whereas the higher MA content amorphous copolymers show a negative deviation from the linear additive behavior. The o-PS intensity shows a linear behavior with MA content with a slight deviation from the additive linear behavior for the very high-content MA copolymer. These variations in the measured positron lifetime parameters are interpreted in terms of the copolymer morphology. © 2010 Wiley Periodicals, Inc.
dc.description.versionArticle
dc.identifier.citationJournal of Applied Polymer Science
dc.identifier.citation119
dc.identifier.citation2
dc.identifier.issn218995
dc.identifier.other10.1002/app.32550
dc.identifier.urihttp://hdl.handle.net/10019.1/11172
dc.subjectAmorphous copolymers
dc.subjectcopolymer composition structural properties
dc.subjectCopolymer compositions
dc.subjectCopolymerisation
dc.subjectCrystallinities
dc.subjectFeed ratios
dc.subjectGlass transition temperature
dc.subjectHigh-content
dc.subjectLinear behavior
dc.subjectLinear decrease
dc.subjectMethyl acrylates
dc.subjectNegative deviations
dc.subjecto-Ps lifetime
dc.subjectortho-Positronium lifetime
dc.subjectPositron annihilation lifetime spectroscopy
dc.subjectPositron annihilation lifetimes
dc.subjectPositron lifetime
dc.subjectSemicrystallines
dc.subjectCopolymerization
dc.subjectCopolymers
dc.subjectElectrons
dc.subjectEmulsification
dc.subjectFree radicals
dc.subjectGlass
dc.subjectMorphology
dc.subjectPlastic products
dc.subjectPositron annihilation
dc.subjectPositron annihilation spectroscopy
dc.subjectStructural properties
dc.subjectTemperature
dc.subjectGlass transition
dc.titlePoly(acrylonitrile-co-methyl acrylate) copolymers: Correlation between copolymer composition, morphology and positron annihilation lifetime parameters
dc.typeArticle
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