Thermo-mechanical properties of hyperbranched polymer modified epoxies

The thermo-mechanical properties of hyperbranched polymer-epoxy blends and their dependence on hyperbranched polymer shell chemistry were investigated. Hyperbranched polymers were shown to be able to increase resin toughness by inducing both a heterogeneous and homogeneous morphology. While the form...

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Bibliographic Details
Published inJournal of materials science Vol. 36; no. 20; pp. 4883 - 4891
Main Authors MEZZENGA, R, MANSON, J. A. E
Format Journal Article
LanguageEnglish
Published Heidelberg Springer 15.10.2001
Springer Nature B.V
Subjects
Applied sciences
Composition
Dependence
Dynamic mechanical analysis
Exact sciences and technology
Fracture toughness
Glass transition temperature
Materials science
Mechanical properties
Morphology
Organic chemistry
Organic polymers
Physicochemistry of polymers
Polymer blends
Polymers
Properties and characterization
Stiffness
Thermomechanical properties
Toughening
Strengthening
Polyfunctional compound
Branched polymer
Concentration effect
Mechanical properties
Epoxy resin
Experimental study
Glass transition temperature
Mechanism
Modified material
Fracture toughness
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Summary:The thermo-mechanical properties of hyperbranched polymer-epoxy blends and their dependence on hyperbranched polymer shell chemistry were investigated. Hyperbranched polymers were shown to be able to increase resin toughness by inducing both a heterogeneous and homogeneous morphology. While the former was better performing in terms of toughness, the latter showed satisfactory toughness together with complete transparency. In order to understand fracture toughness enhancement, toughening mechanisms as well as the properties of both matrix and particles were studied. Particle composition was derived by combining dynamic mechanical analysis and the Fox equation. This resulted in an evaluation not only of particle composition but also of glass transition temperature and stiffness, whose value was cross-checked by a micro-mechanical model. The complete picture concerning particle and matrix properties, as well as toughening mechanisms and their dependence on hyperbranched polymer shell chemistry, finally enabled defining the optimum molecular design of the hyperbranched polymers in order to achieve the desired fracture toughness.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0022-2461
1573-4803
DOI:10.1023/A:1011880019156