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On the importance of specific interface area in clay nanocomposites of PMMA filled with synthetic nano-mica

Title data

Ziadeh, Mazen ; Fischer, Bianca ; Schmid, Jasmin ; Altstädt, Volker ; Breu, Josef:
On the importance of specific interface area in clay nanocomposites of PMMA filled with synthetic nano-mica.
In: Polymer. Vol. 55 (August 2014) Issue 16 . - pp. 3770-3781.
ISSN 0032-3861
DOI: https://doi.org/10.1016/j.polymer.2014.05.063

Official URL: Volltext

Abstract in another language

In clay nanocomposites, the specific interface area is the key factor determining potential improvements of properties. Nevertheless, in most systematic studies of nanocomposites little emphasis is put on assuring and characterizing dispersion quality. To probe the influence of dispersion quality, we compare nanocomposites filled with two layered silicates which were made by melt compounding and solution blending, respectively. Poly(methyl methacrylate) (PMMA) is chosen here as a thermoplastic model matrix which was compounded with a synthetic nano-mica (O-hect) and commercial Bentone with typical diameters of 5-7 mu m and <300 nm, respectively. The dispersion quality was monitored by mu-computer tomography (mu-CT) and transmission electron microscopy (TEM). Moreover, gas barrier measurements proved to be an additional independent and very sensitive probe. Reductions of the oxygen permeation at similar to 4 wt.% by 60% and 30% for solution blended and melt compounded samples directly evidence a mediocre dispersion in the latter. Structure-property relationships were established by in-depth mechanical testing and the properties were correlated with the improved morphology. Significantly higher stiffness was achieved by enhanced dispersion quality for O-hect-filled nanocomposites without causing any embrittlement. Interestingly, a maximum increase of fracture toughness (63%) was obtained at filler content as low as 0.8 vol.% for the solution blended sample. A similar improvement of fracture toughness for the melt compounded sample afforded more than twice the clay content emphasising the crucial influence of specific surface area. This highlights the importance of the solution blending method to exploit the full potential of nanofillers and suggests that only samples with comparable dispersion quality may be compared.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: PMMA/clay nanocomposites; Nano-mica; Mechanical properties
Institutions of the University: Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Anorganic Chemistry I
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Anorganic Chemistry I > Chair Anorganic Chemistry I - Univ.-Prof. Dr. Josef Breu
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Polymer Engineering
Faculties > Faculty of Engineering Science > Chair Polymer Engineering > Chair Polymer Engineering - Univ.-Prof. Dr.-Ing. Volker Altstädt
Research Institutions > Collaborative Research Centers, Research Unit > SFB 840 Von partikulären Nanosystemen zur Mesotechnologie
Research Institutions > Collaborative Research Centers, Research Unit > SFB 840 Von partikulären Nanosystemen zur Mesotechnologie > SFB 840 - TP B 3
Research Institutions
Research Institutions > Collaborative Research Centers, Research Unit
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 29 Mar 2018 09:34
Last Modified: 29 Mar 2018 09:34
URI: https://eref.uni-bayreuth.de/id/eprint/43162