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Effect of Different Types of Block Copolymers on Morphology, Mechanical Properties, and Fracture Mechanisms of Bisphenol-F Based Epoxy System

Institut für Verbundwerkstoffe GmbH (IVW), Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Strasse, Building 58, 67663 Kaiserslautern, Germany
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Author to whom correspondence should be addressed.
Current affiliation: University Bordeaux, CNRS, Bordeaux INP, LCPO, UMR 5629, F-33600 Pessac, France.
J. Compos. Sci. 2019, 3(3), 68; https://doi.org/10.3390/jcs3030068
Received: 31 May 2019 / Revised: 19 June 2019 / Accepted: 1 July 2019 / Published: 4 July 2019
(This article belongs to the Special Issue Feature Papers in Journal of Composites Science in 2019)
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Abstract

The effect of adding different types of soft block copolymer on the tensile properties, fracture mechanic properties, and thermo-mechanical properties of bisphenol F based epoxy resin were studied. Two different self-assembling block copolymers, (a) constituting of a center block of poly (butyl acrylate) and two side blocks of poly (methyl) methacrylate-co-polar co-monomer (BCP 1) and (b) poly(ethylene oxide)-b-poly(butylene oxide) (PEO-PBO) diblock copolymer (BCP 2), were used with an epoxy-hardener system. The maximum fracture toughness and fracture energy were measured as KIc = 2.75 MPa·m1/2 and GIc = 2.37 kJ/m2 for the 10 wt % of BCP 1 modified system, which were 366% and 2270% higher in comparison to reference epoxy system, and a 63% reduction in tensile strength was also observed. Similarly, for BCP2 modified systems, the maximum value of KIc = 1.65 MPa·m1/2 and GIc = 1.10 kJ/m2 was obtained for epoxy modified with 12 wt % of BCP2 and a reduction of 32% in tensile strength. The fracture toughness and fracture energy were co-related to the plastic zone size for all the modified systems. Finally, the analysis of the fracture surfaces revealed the toughening micro-mechanisms of the nanocomposites. View Full-Text
Keywords: epoxy; block copolymers; fracture toughness; tensile strength epoxy; block copolymers; fracture toughness; tensile strength
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MDPI and ACS Style

Bajpai, A.; Wetzel, B. Effect of Different Types of Block Copolymers on Morphology, Mechanical Properties, and Fracture Mechanisms of Bisphenol-F Based Epoxy System. J. Compos. Sci. 2019, 3, 68.

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