Large strain and toughness enhancement of poly(dimethyl siloxane) composite films filled with electrospun polyacrylonitrile-graft-poly(dimethyl siloxane) fibres and multi-walled carbon nanotubes

Date
2011
Authors
Bayley G.M.
Hedenqvist M.
Mallon P.E.
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Unfilled cross-linked poly(dimethyl siloxane) (PDMS) is a weak material and is generally filled with high levels of particulate fillers such as silica, calcium carbonate and carbon black to improve its mechanical properties. The use of fibrous fillers such as electrospun nanofibres and multi-walled carbon nanotubes as fillers for PDMS has not been widely studied. In this study anew copolymer, polyacrylonitrile-graft-poly(dimethyl siloxane) (PAN-g-PDMS), is used as fibrous filler for PDMS. The graft copolymer is electrospun to produce the fibre filler material. It is shown how the PDMS content of the graft copolymer provides increased compatibility with silicone matrices and excellent dispersion of the fibre fillers throughout a silicone matrix. It is also shown that it is possible to include multi-walled carbon nanotubes in the electrospun fibres which are subsequently dispersed in the PDMS matrix. Fibre mats were used in the non-woven and the aligned forms. The differently prepared fibre composites have significantly different mechanical properties. Conventional composites using fibrous fillers usually show increased strength and stiffness but usually with a resultant loss of strain. In the case of the composites produced in this study there is a dramatic improvement in the extensibility of the non-woven PAN-g-PDMS fibre mat filled silicone films of up to 470%.© 2011 Elsevier Ltd. All rights reserved.
Description
Keywords
Electrospinning, Multi-walled carbon nanotubes, Nano-composites, Electrospuns, Fibre mats, Fibrous fillers, Filler materials, Large strains, matrix, Non-woven, Particulate fillers, Polydimethylsiloxane PDMS, Toughness enhancement, Calcium carbonate, Carbon black, Carbon films, Copolymerization, Fibers, Fillers, Graft copolymers, Grafting (chemical), Microchannels, Nanocomposite films, Nanocomposites, Silica, Silicones, Strain, Toughness, Weaving, Multiwalled carbon nanotubes (MWCN)
Citation
Polymer
52
18
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