Investigation of Transcrystalline Interphases in Polypropylene/Glass Fiber Composites Using Micromechanical Tests
| Autor: | Edith Mäder, Hanna M. Brodowsky |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Toughness
Materials science Glass fiber Nucleation 02 engineering and technology 010402 general chemistry polymer-matrix composites 01 natural sciences Biomaterials chemistry.chemical_compound lcsh:TP890-933 transcrystallinity lcsh:TP200-248 Fiber Composite material lcsh:QH301-705.5 Civil and Structural Engineering Polypropylene lcsh:Chemicals: Manufacture use etc micromechanical tests 021001 nanoscience & nanotechnology Surface energy lcsh:QC1-999 0104 chemical sciences chemistry lcsh:Biology (General) Mechanics of Materials Ceramics and Composites mechanical behavior Surface modification interface Interphase lcsh:Textile bleaching dyeing printing etc polypropylene glass fiber 0210 nano-technology lcsh:Physics |
| Zdroj: | Fibers; Volume 6; Issue 1; Pages: 16 Fibers, Vol 6, Iss 1, p 16 (2018) |
| ISSN: | 2079-6439 |
| DOI: | 10.3390/fib6010016 |
| Popis: | In composites, a strong interphase between the components is essential for mechanical properties. By using a suitable sizing (i.e., surface modification) of the fiber, the interphase may be varied, e.g., by suppressing or promoting heterogeneous nucleation of a thermoplastic matrix. In the latter case, three-dimensional transcrystallized interphases with properties differing from those of the bulk matrix are formed. Polypropylene-glass fiber composites are prepared as single-fiber model composites with (a) sizings either inducing or suppressing a transcrystalline interphase, (b) different amounts of modifier maleic acid anhydride grafted polypropylene, and (c) different molecular weights of the matrix polymer. These are studied in quasi-static or cyclic load tests. Static tests permit insights in the interfacial characteristics such as critical interface energy release rate, adhesion strength and frictional stress. Cyclic tests on these model composites can be used to study the nature of dissipative processes and the damage behavior. Atomic Force Microscopy (AFM) investigations of the fiber fracture surfaces provide supplementary information. The transcrystalline layer can indeed improve the mechanical parameters (a 70–100% increase of strength and a 25 or 125% increase in toughness, depending on the molecular weight (MW) of the matrix polymer at low modifier concentration). However, the effect is partially neutralized by an opposing effect: high nucleation in the bulk in samples with commonly used concentrations of modifier. |
| Databáze: | OpenAIRE |
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