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          Institute: MPI für Polymerforschung     Collection: MPI Polymerforschung     Display Documents

ID: 28392.0, MPI für Polymerforschung / MPI Polymerforschung
Crack propagation and defect formation at polymer interfaces investigated by ultra-small angle X-ray scattering
Authors:Lorenz-Haas, C.; Müller-Buschbaum, P.; Ittner, T.; Kraus, J.; Mahltig, B.; Cunis, S.; Krosigk, G. V.; Gehrke, R.; Creton, C.; Stamm, Manfred
Date of Publication (YYYY-MM-DD):2003
Title of Journal:Physical Chemistry Chemical Physics
Journal Abbrev.:Phys. Chem. Chem. Phys.
Issue / Number:6
Start Page:1235
End Page:1241
Review Status:not specified
Audience:Not Specified
Abstract / Description:The double cantilever beam test (DCB) was used to estimate the fracture toughness of poly(methyl-methacrylate) (PMMA). With the help of given neutron reflectometry (NR) results for PMMA a correlation between fracture toughness and interface width was established. It displays a three regime behaviour similar to polystyrene (PS). For the first time, deformation and defect structures in the vicinity of the crack tip were investigated by scanning ultra-small angle X-ray scattering (S-USAX) where a beam from a synchrotron source is scanned over the sample. It is concluded that crack propagation during the DCB measurement is connected with large deformations and defect formation, where the plastic deformation zone extends over a large size ( > 400 mum). Following a model for scattering from diffuse boundaries it was concluded that the diffusiveness increases from the outer edges to the centre of the plastic zone. S-USAX thus provides details of sample failure at a microscopic level as well as information about the structure of the defect boundaries and their distribution across the plastic zone.
Comment of the Author/Creator:Date: 2003
External Publication Status:published
Document Type:Article
Affiliations:MPI für Polymerforschung
External Affiliations:Tech Univ Munich, Phys Dept LS E13, D-85747 Garching, Germany; Inst Polymerforsch Dresden eV, D-01069 Dresden, Germany; DESY, HASYLAB, D-22607 Hamburg, Germany; Ecole Super Phys & Chim Ind Ville Paris, PCSM, F-75231 Paris 05, France
Identifiers:ISI:000181288700037 [ID No:1]
ISSN:1463-9076 [ID No:2]
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