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Digitale Medien

Dynamic and static light scattering study of the formation of cross-linked PMMA gels (1999)

Lesturgeon, V. ; Nicolai, T. ; Durand, D.

Springer

The European physical journal 9 (1999), S. 71-82

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ISSN: 1434-6036

Schlagwort(e): PACS. 36.20.-r Macromolecules and polymer molecules - 61.10.-i X-ray diffraction and scattering - 82.70.Gg Gels and sols

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract: Free radical co-polymerization of methyl methacrylate (MMA) and ethyl glycol dimethyl metacrylate (EGDMA) was investigated in solution at different molar ratios R = [EGDMA]/[MMA] between 0 and 0.05. Initially mainly linear PMMA was formed with weight average molar mass 7.5 g/mol independent of R. At larger reaction extents branched polymers were formed and the systems gelled. The scattering intensity rose initially with the reaction extent, but reached a plateau value at larger reaction extents. The plateau value increased strongly with R. Dynamic light scattering showed the appearance of a slow relaxation not observed in linear PMMA solutions. The data can be interpreted by assuming that the excess scattering originates from the branching points and relaxes through self diffusion of the branched particles. The results agree with predictions of the percolation model for gelation and Rouse dynamics. Viscosity measurements corroborate this interpretation. Measurements on a progressively diluted sample quenched close to the gel point again showed quantitative agreement with the percolation model for gelation.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/s100510050743

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Digitale Medien

Comments on a kinetic approach of multifunctional polycondensation and gelation by J. W. Stafford (1983)

Durand, D. ; Riviere, M. ; Bruneau, C. M.

New York : Wiley-Blackwell

Journal of Polymer Science: Polymer Chemistry Edition 21 (1983), S. 2945-2946

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ISSN: 0360-6376

Schlagwort(e): Physics ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie