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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/2859

Title: Relationships between microvoid heterogeneity and physical properties in cross-linked elastomers: An NMR imaging study
Authors: ADRIAENSENS, Peter
White, JL
Kelchtermans, M
Issue Date: 2000
Citation: MACROMOLECULES, 33(19). p. 7116-7121
Abstract: H-1 NMR imaging experiments identify the presence of microvoids in cross-linked poly-(isobutylene-p-methylstyrene-p-bromomethlstyrene) (PIB-PMS/BrPMS) terpolymers, for both solid and solvent-swollen samples. Three-dimensional reconstruction of the sample images reveals that the voids are spherically shaped. A statistical analysis of the void density in six commercial (i.e., cured and carbon black filled) isobutylene-based elastomers indicates a strong linear correlation between the mechanical performance and the average number of voids per unit area (R = 0.972). In addition, the average number of neighboring voids within a radius of 1 mm per void was indicative of mechanical performance (R = 0.945). Our experimental results indicate that high microvoid density in cured elastomers leads to crack initiation and accelerated crack growth, thereby resulting in premature mechanical failure of the material. As this relationship is most likely general for many cured polymer compounds, we believe NMR imaging provides a particularly attractive approach to obtaining microvoid densities over bulk length scales in technically important materials.
Notes: Univ Limburg, Inst Materialres, IMO, Dept SBG, B-3590 Diepenbeek, Belgium. ExxonMobil Chem, Baytown, TX 77520 USA. ExxonMobil Chem Europe, B-1831 Machelen, Belgium.Gelan, J, Univ Limburg, Inst Materialres, IMO, Dept SBG, Univ Campus, B-3590 Diepenbeek, Belgium.
URI: http://hdl.handle.net/1942/2859
ISI #: 000089461800033
ISSN: 0024-9297
Category: A1
Type: Journal Contribution
Validation: ecoom, 2001
Appears in Collections: Research publications

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