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Characterization of electrosterically stabilized polystyrene latex; implications for radical entry kinetics

de Bruyn, Hank; Gilbert, Robert G; White, John; Schulz, Jamie

Description

Electrosterically stabilized polystyrene latexes with a poly(acrylic acid) hydrophilic layer with either perdeuterated core or perdeuterated hydrophilic layer were prepared in situ in a styrene/acrylic acid copolymerization, in a manner similar to that commonly employed industrially. Small angle neutron scattering (SANS) measurements were made over a range of contrasts for three latexes at high and low pH. Parameters obtained by fitting to standard core/shell models were consistent with the...[Show more]

dc.contributor.authorde Bruyn, Hank
dc.contributor.authorGilbert, Robert G
dc.contributor.authorWhite, John
dc.contributor.authorSchulz, Jamie
dc.date.accessioned2015-12-13T23:12:32Z
dc.date.available2015-12-13T23:12:32Z
dc.identifier.issn0032-3861
dc.identifier.urihttp://hdl.handle.net/1885/88110
dc.description.abstractElectrosterically stabilized polystyrene latexes with a poly(acrylic acid) hydrophilic layer with either perdeuterated core or perdeuterated hydrophilic layer were prepared in situ in a styrene/acrylic acid copolymerization, in a manner similar to that commonly employed industrially. Small angle neutron scattering (SANS) measurements were made over a range of contrasts for three latexes at high and low pH. Parameters obtained by fitting to standard core/shell models were consistent with the shell being highly hydrated (about 89% at low pH and about 94% at high pH). The core was found to contain about 3% acrylic acid. Doubling the proportion of acrylic acid in the recipe increased shell thickness by about 20%, slightly reduced particle size and slightly increased the proportion of acrylic acid incorporated into the core. The maximum degree of polymerization (DOP) of the entering (and therefore grafted) species was estimated from the shell thickness to be about 44 monomer units for 0.02 M acrylic acid and 66 for 0.04 M. The observed dependence of hairy layer (shell) thickness on the initial amount of acrylic acid suggests that the critical DOP for entry (and therefore true grafting) of the electrosteric stabilizer is thermodynamically (not kinetically) controlled.
dc.publisherElsevier
dc.sourcePolymer
dc.subjectKeywords: Copolymerization; Grafting (chemical); Hydrophilicity; Latexes; pH effects; Styrene; Thermodynamic stability; Electrosteric stabilization; Polystyrenes; acrylic acid; latex; polyacrylic acid; polystyrene; radical; styrene; article; chemical reaction kinet Latex; SANS; Styrene
dc.titleCharacterization of electrosterically stabilized polystyrene latex; implications for radical entry kinetics
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume44
dc.date.issued2003
local.identifier.absfor030603 - Colloid and Surface Chemistry
local.identifier.ariespublicationMigratedxPub17640
local.type.statusPublished Version
local.contributor.affiliationde Bruyn, Hank, University of Sydney
local.contributor.affiliationGilbert, Robert G, University of Sydney
local.contributor.affiliationWhite, John, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationSchulz, Jamie, National Institute of Standards and Technology
local.bibliographicCitation.startpage4411
local.bibliographicCitation.lastpage4420
local.identifier.doi10.1016/S0032-3861(03)00452-X
dc.date.updated2015-12-12T08:31:59Z
local.identifier.scopusID2-s2.0-0038265459
CollectionsANU Research Publications

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