Journal
POLYMER TESTING
Volume 31, Issue 8, Pages 1008-1018Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymertesting.2012.08.001
Keywords
Scanning probe microscopy; Nanomechanical testing; Morphology; Polymers; Polyetherimide; Tetra-functional epoxy resin
Funding
- Bayerisches Staatsministerium fur Wirtschaft, Infrastruktur, Verkehr und Technologie within the programme Neue Werkstoffe in Bayern
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High resolution nanomechanical analysis in combination with high resolution topography imaging was used to investigate the phase morphology of a polyetherimide-toughened tetra-functional epoxy resin. A two-phase structure close to co-continuous morphology is observed. Here, polyetherimide and epoxy-rich regions can be clearly identified due to their different nanomechanical properties. Within the PEI-rich regions, the high resolution testing allows identification of polyetherimide-rich globules with a size between 50 nm and 500 nm, in addition to the well-known epoxy-rich rounded substructures with a diameter of about one micrometer. Etching influences the surface elastic properties and results in an increase of the epoxy surface modulus. Surface ageing results in a slight increase of the surface modulus. (C) 2012 Elsevier Ltd. All rights reserved.
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