Importance of thermodynamic interactions on the dynamics of multicomponent polymer systems revealed by examination of the dynamics of copolymer/homopolymer blends.

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dc.contributor.authorKamath, SYen_AU
dc.contributor.authorArlen, MJen_AU
dc.contributor.authorHamilton, WAen_AU
dc.contributor.authorDadmun, MDen_AU
dc.date.accessioned2008-08-19T04:20:11Zen_AU
dc.date.accessioned2010-04-30T05:05:55Zen_AU
dc.date.available2008-08-19T04:20:11Zen_AU
dc.date.available2010-04-30T05:05:55Zen_AU
dc.date.issued2008-05-13en_AU
dc.date.statistics2008-05en_AU
dc.description.abstractThe effect of copolymer composition oil their dynamics in a homopolymer matrix has been studied using specular neutron reflectivity (NR). We have monitored the segregation process of random copolymers, containing styrene (S) and methyl niethacrylate (MMA), to the d-PS/d-PMMA interface from a polymer matrix. Four random copolymers containing 50, 54, 67, and 80% MMA were studied at 10 wt % loading in d-PMMA, where the interfacial excess, Z*, growth scaled as t(1/2) as predicted by theory. These results are correlated to the diffusion-limited growth of a copolymer wetting layer at the d-PS/d-PMMA interface. The mutual and tracer diffusion coefficients and the effective friction coefficients for these copolymers were then determined. The results demonstrate that the copolymer composition has a significant impact on its dynamics. Copolymer dynamics are significantly faster than those for a diblock copolymer at the same composition, which indicates that the impact of the change in composition is more than that due to an increase in the MMA content in the copolymer. Analysis of the friction factor using the Lodge-McLeish model indicates that the local composition around a copolymer is richer in styrene than the model predicts. We attribute this to the fact that the model uses only chain connectivity to calculate the self-concentration and does not include contributions due to thermodynamic interactions between the two blend components. The observation that the local environment around a copolymer is richer in styrene is in agreement with our simulation results and indicates that the styrene monomers in the copolymer aggregate together to minimize contact with the PMMA matrix. These results exemplify the importance of thermodynamic interactions on the dynamics of multicomponent polymer systems, particularly miscible homopolymer/copolymer blends. © 2008, American Chemical Societyen_AU
dc.identifier.citationKamath, S. Y., Arlen, M. J., Hamilton, W. A., & Dadmun, M. D. (2008). The importance of thermodynamic interactions on the dynamics of multicomponent polymer systems revealed by examination of the dynamics of copolymer/homopolymer blends. Macromolecules, 41(9), 3339-3348. doi:10.1021%2Fma0704212en_AU
dc.identifier.govdoc1381en_AU
dc.identifier.issn0024-9297en_AU
dc.identifier.issue9en_AU
dc.identifier.journaltitleMacromoleculesen_AU
dc.identifier.pagination3339-3348en_AU
dc.identifier.urihttp://dx.doi.org/10.1021%2Fma0704212en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1189en_AU
dc.identifier.volume41en_AU
dc.language.isoenen_AU
dc.publisherAmerican Chemical Societyen_AU
dc.subjectIsopreneen_AU
dc.subjectCopolymersen_AU
dc.subjectDistributionen_AU
dc.subjectNeutron reflectorsen_AU
dc.subjectPolymersen_AU
dc.subjectFluctuationsen_AU
dc.subjectMonomersen_AU
dc.subjectMatricesen_AU
dc.titleImportance of thermodynamic interactions on the dynamics of multicomponent polymer systems revealed by examination of the dynamics of copolymer/homopolymer blends.en_AU
dc.typeJournal Articleen_AU
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