Elastic Properties of Polymer Melts Filled with Nanoparticles

  • The influence of silica nanoparticles on the elasticity of a polymethylmethacrylate (PMMA) melt was investigated. The extrudate swell obtained from the extrusion of the melt through a die and the recoverable deformation after a creep test were measured. As well known from other materials, the extrudate swell becomes smaller by adding fillers, i.e. the elasticity decreases. This is usually explained by the effect of substituting viscoelastic polymer molecules by rigid particles. The linear steady‐state recoverable compliance Je0, however, attains values which are significantly higher than those of the matrix indicating an increase of the elasticity. This effect is postulated to be due to inteThe influence of silica nanoparticles on the elasticity of a polymethylmethacrylate (PMMA) melt was investigated. The extrudate swell obtained from the extrusion of the melt through a die and the recoverable deformation after a creep test were measured. As well known from other materials, the extrudate swell becomes smaller by adding fillers, i.e. the elasticity decreases. This is usually explained by the effect of substituting viscoelastic polymer molecules by rigid particles. The linear steady‐state recoverable compliance Je0, however, attains values which are significantly higher than those of the matrix indicating an increase of the elasticity. This effect is postulated to be due to interactions of the matrix molecules with the particle surface giving rise to longer retardation times and higher retardation strengths which lead to larger Je0 according to the theory of linear viscoelasticity. The apparent discrepancy between these two contrary effects is solved by the finding that the recoverable compliance becomes smaller with stress above a critical value and approaches the elasticity of the matrix. This decrease is found in a stress range which is much lower than that applied in the extrudate‐swell experiment. The results of an elastic compliance becoming smaller with stress are interpreted by a detachment of the matrix molecules from the particles.show moreshow less

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Metadaten
Author:Helmut Münstedt, Christian Triebel
URN:urn:nbn:de:bvb:29-opus-37762
Title of the journal / compilation:AIP Conference Proceedings 1375 (2011): S. 201-207. 05.11.2012 <http://proceedings.aip.org/resource/2/apcpcs/1375/1/201_1>
Document Type:Article
Language:English
Date of Publication (online):2012/11/06
Publishing Institution:Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
Release Date:2012/11/06
Tag:deformation; extrusion; polymer melts; viscoelasticity
SWD-Keyword:-
Original publication:AIP Conference Proceedings 1375 (2011): S. 201-207. 05.11.2012 <http://proceedings.aip.org/resource/2/apcpcs/1375/1/201_1>
Institutes:Technische Fakultät -ohne weitere Spezifikation-
Dewey Decimal Classification:600 Technik, Technologie
PACS-Classification:81.10.Fq Growth from melts; zone melting and refining
83.10.Bb Kinematics of deformation and flow; Non-Newtonian fluid flows, see 47.50.-d
83.60.Bc Linear viscoelasticity
83.80.Sg Polymer melts
Collections:Allianzlizenzen 2011

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