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Impact of large aspect ratio, shear-stiff, mica-like clay on mechanical behavior of PMMA/clay nanocomposites

Titelangaben

Fischer, Bianca ; Ziadeh, Mazen ; Pfaff, André ; Breu, Josef ; Altstädt, Volker:
Impact of large aspect ratio, shear-stiff, mica-like clay on mechanical behavior of PMMA/clay nanocomposites.
In: Polymer. Bd. 53 (6 Juli 2012) Heft 15 . - S. 3230-3237.
ISSN 0032-3861
DOI: https://doi.org/10.1016/j.polymer.2012.04.055

Abstract

For the first time poly(methyl methacrylate) (PMMA) nanocomposites based on a synthetic shear-stiff, mica-like K-fluorohectorite clay were prepared by melt -compounding. Besides stiffness, this new synthetic type of clay offers very high aspect ratios above 600 after exfoliation, whereas a tailored surface modification of the clay yielded a good compatibility to the matrix material. The influence of different clay loadings (0–4 wt.-%) on mechanical behaviour of PMMA/clay nanocomposites were studied for two aspect ratios (≈55 and ≈620), set into correlation with morphology and compared to natural montmorillonite (MMT) clay, which has an aspect ratio of ≈50. It was found, that the use of these novel nanoplatelets leads to a significantly increased fracture toughness of about 25 and 70% in the case of an aspect ratio of 55 and 620, respectively, in comparison to neat PMMA, without sacrificing tensile strength. Scanning electron microscopy (SEM) analysis of the corresponding fracture surfaces and μ-computer tomography (μ-CT) revealed a high dispersion quality of the synthetic organo-clay in PMMA. Different fracture mechanisms could be identified. The presence of the nanofiller varies the local stress state in the matrix and promotes additional energy dissipating mechanisms like crack deflection, crack pinning as well as debonding effects with platelets pull-out leading to enhanced fracture toughness.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: Mica-like nanofiller; Large aspect ratio; Poly(methyl methacrylate)
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Anorganische Chemie I > Lehrstuhl Anorganische Chemie I - Univ.-Prof. Dr. Josef Breu
Forschungseinrichtungen > Sonderforschungsbereiche, Forschergruppen > SFB 840 Von partikulären Nanosystemen zur Mesotechnologie
Forschungseinrichtungen > Sonderforschungsbereiche, Forschergruppen > SFB 840 Von partikulären Nanosystemen zur Mesotechnologie > SFB 840 - TP B 3
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Anorganische Chemie I
Forschungseinrichtungen
Forschungseinrichtungen > Sonderforschungsbereiche, Forschergruppen
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 540 Chemie
Eingestellt am: 21 Mär 2018 13:24
Letzte Änderung: 21 Mär 2018 13:24
URI: https://eref.uni-bayreuth.de/id/eprint/9750