Full metadata record
DC Field | Value | Language |
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dc.contributor.author | WON, J | - |
dc.contributor.author | ONYENEMEZU, C | - |
dc.contributor.author | MILLER, WG | - |
dc.contributor.author | LODGE, TP | - |
dc.date.accessioned | 2024-01-21T21:14:47Z | - |
dc.date.available | 2024-01-21T21:14:47Z | - |
dc.date.created | 2022-01-11 | - |
dc.date.issued | 1994-12-05 | - |
dc.identifier.issn | 0024-9297 | - |
dc.identifier.uri | https://pubs.kist.re.kr/handle/201004/145428 | - |
dc.description.abstract | Dynamic light scattering has been used to follow the tracer diffusion of polystyrene spheres (R approximate to 200 nm) in dilute, semidilute, and entangled solutions of poly(vinyl methyl ether) (M(w) = 1.3 x 10(6)). Over this range of matrix concentrations, 0 less than or equal to e[eta] less than or equal to 36, the diffusivity drops by almost 5 orders of magnitude. Near c(*) (approximate to[eta]-(1)) for the matrix, the diffusivity exceeds that estimated from the bulk solution viscosity via the Stokes-Einstein relation by a factor of about 3. Such ''positive deviations'' from Stokes-Einstein behavior have been reported previously in several systems. However, once the matrix concentration is sufficiently high for entanglements to be effective, Stokes-Einstein behavior is recovered. This new result was. confirmed via forced Rayleigh scattering. In-addition, these data can reconcile measurements of sphere diffusion with reptation-based models fdr chain mobility in well-entangled systems. The behavior near c(*) is discussed,is terms of the matrix correlation length, xi, which has a maximum at xi approximate to R(g) for c approximate to c(*). It is noted that the fluid; layer within a distance w of the sphere surface will, in general, differ in composition from the bulk solution, and consequently the sphere mobility may well not sense the macroscopic solution viscosity, particularly near c(*). As a corollary, for large matrix chains, dynamic light scattering may not monitor the long-time diffusion of the spheres near c(*), because q xi approximate to qR(g) x 1, rather than q xi << 1. | - |
dc.language | English | - |
dc.publisher | AMER CHEMICAL SOC | - |
dc.subject | POLYSTYRENE LATEX SPHERES | - |
dc.subject | DYNAMIC LIGHT-SCATTERING | - |
dc.subject | POLYVINYL METHYL-ETHER) SOLUTIONS | - |
dc.subject | HYDRODYNAMIC SCALING MODEL | - |
dc.subject | POLY(ACRYLIC ACID) WATER | - |
dc.subject | PROBE DIFFUSION | - |
dc.subject | TRACER-DIFFUSION | - |
dc.subject | SELF-DIFFUSION | - |
dc.subject | LINEAR POLYSTYRENES | - |
dc.subject | TRANSLATIONAL DIFFUSION | - |
dc.title | DIFFUSION OF SPHERES IN ENTANGLED POLYMER-SOLUTIONS - A RETURN TO STOKES-EINSTEIN BEHAVIOR | - |
dc.type | Article | - |
dc.identifier.doi | 10.1021/ma00103a020 | - |
dc.description.journalClass | 1 | - |
dc.identifier.bibliographicCitation | MACROMOLECULES, v.27, no.25, pp.7389 - 7396 | - |
dc.citation.title | MACROMOLECULES | - |
dc.citation.volume | 27 | - |
dc.citation.number | 25 | - |
dc.citation.startPage | 7389 | - |
dc.citation.endPage | 7396 | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.identifier.wosid | A1994PW05900020 | - |
dc.identifier.scopusid | 2-s2.0-0028765985 | - |
dc.relation.journalWebOfScienceCategory | Polymer Science | - |
dc.relation.journalResearchArea | Polymer Science | - |
dc.type.docType | Article | - |
dc.subject.keywordPlus | POLYSTYRENE LATEX SPHERES | - |
dc.subject.keywordPlus | DYNAMIC LIGHT-SCATTERING | - |
dc.subject.keywordPlus | POLYVINYL METHYL-ETHER) SOLUTIONS | - |
dc.subject.keywordPlus | HYDRODYNAMIC SCALING MODEL | - |
dc.subject.keywordPlus | POLY(ACRYLIC ACID) WATER | - |
dc.subject.keywordPlus | PROBE DIFFUSION | - |
dc.subject.keywordPlus | TRACER-DIFFUSION | - |
dc.subject.keywordPlus | SELF-DIFFUSION | - |
dc.subject.keywordPlus | LINEAR POLYSTYRENES | - |
dc.subject.keywordPlus | TRANSLATIONAL DIFFUSION | - |
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