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Fibers 2018, 6(1), 16; https://doi.org/10.3390/fib6010016

Investigation of Transcrystalline Interphases in Polypropylene/Glass Fiber Composites Using Micromechanical Tests

Leibniz-Institut für Polymerforschung Dresden, e.V. (IPF) Hohe Str. 6, D-01069 Dresden, Germany
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Received: 20 December 2017 / Revised: 26 January 2018 / Accepted: 30 January 2018 / Published: 12 March 2018
(This article belongs to the Special Issue Glass Fibers 2018)
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Abstract

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. View Full-Text
Keywords: polypropylene; glass fiber; polymer-matrix composites; interface; mechanical behavior; transcrystallinity; micromechanical tests polypropylene; glass fiber; polymer-matrix composites; interface; mechanical behavior; transcrystallinity; micromechanical tests
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Brodowsky, H.; Mäder, E. Investigation of Transcrystalline Interphases in Polypropylene/Glass Fiber Composites Using Micromechanical Tests. Fibers 2018, 6, 16.

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