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Mechanical properties of epoxy/boehmite nanocomposites in dependency of mass fraction and surface modification - An experimental and numerical approach

Jux, Maximilian and Fankhänel, Johannes and Daum, Benedikt and Mahrholz, Thorsten and Sinapius, Michael and Rolfes, Raimund (2018) Mechanical properties of epoxy/boehmite nanocomposites in dependency of mass fraction and surface modification - An experimental and numerical approach. Polymer, 141, pp. 34-45. Elsevier. doi: 10.1016/j.polymer.2018.02.059. ISSN 0032-3861.

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Official URL: https://www.sciencedirect.com/science/article/pii/S0032386118301915

Abstract

Boehmite nanoparticles show great potential in improving the matrix dominated mechanical properties of fiber reinforced polymers. For the material design process and the prediction of the nanocomposite's properties, knowledge about the material behavior of the constituent phases and their interactions is crucial. Since the chemical composition of the particle surface can strongly affect the interaction between particle and matrix, the influence of particle surface modification and mass fraction on mechanical properties (tensile modulus, tensile strength, fracture toughness) and failure mechanisms of nanoparticle reinforced epoxy resins is investigated using experimental and numerical methods. In the present work, unmodified and thus chemically reactive boehmite particles are compared to acetic acid modified particles with supposedly lower chemical reactivity and thus worse particle-matrix bonding. A linear relationship between particle mass fraction and tensile modulus/fracture toughness is experimentally found with a maximum increase of 26% in tensile modulus and 62% in critical energy release rate for a particle content of 15 wt%. Furthermore, the experiments indicate that the acetic acid surface modification increases the tensile modulus (up to 6% compared to the unmodified boehmite particles), but at the same time not significantly affects the tensile strength or the fracture toughness. Molecular Dynamic Finite Element Method (MDFEM) simulations are conducted to identify and understand the mechanisms induced by nanoparticles. The material properties of both, modified and unmodified, nanoparticle systems are discussed in relation to the change of particle-matrix bonding strength and interphase morphology. While simulation results of the unmodified system show an outstanding agreement with the experiments, the acetic acid modified system deviates significantly. In conclusion, it seems that additional effects have to be considered to completely understand the material behavior.

Item URL in elib:https://elib.dlr.de/119257/
Document Type:Article
Additional Information:Beitrag aus DFG Projekt FOR2021
Title:Mechanical properties of epoxy/boehmite nanocomposites in dependency of mass fraction and surface modification - An experimental and numerical approach
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Jux, MaximilianMaximilian.Jux (at) dlr.dehttps://orcid.org/0000-0002-0175-2875
Fankhänel, JohannesUniversität Hannover, Inst. für Statik und DynamikUNSPECIFIED
Daum, BenediktUniversität Hannover, Inst. für Statik und DynamikUNSPECIFIED
Mahrholz, ThorstenThorsten.Mahrholz (at) dlr.dehttps://orcid.org/0000-0003-1488-0910
Sinapius, Michaelm.sinapius (at) tu-braunschweig.deUNSPECIFIED
Rolfes, RaimundUniversität Hannover, Inst. für Statik und DynamikUNSPECIFIED
Date:27 February 2018
Journal or Publication Title:Polymer
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:141
DOI :10.1016/j.polymer.2018.02.059
Page Range:pp. 34-45
Editors:
EditorsEmailEditor's ORCID iD
Cheng, Stephen Z.D.University of Akron, Akron, Ohio, USAUNSPECIFIED
Müller, Axel H.E.Johannes Gutenberg Universität Mainz, Mainz, GermanyUNSPECIFIED
Publisher:Elsevier
ISSN:0032-3861
Status:Published
Keywords:Boehmite Nanoparticles Epoxy resin Surface modification Mechanical properties Numerical methods
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Multifunctional Materials
Deposited By: Jux, Maximilian
Deposited On:12 Mar 2018 08:49
Last Modified:31 Jul 2019 20:16

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