Publications

Industry publications

"Organoclay Imparts Scratch Resistance"

David Evans. Grant Edwards. Richard Marshall.
Kunststoffe International, Pages 49-52, 1-2/2017.
Modified clay-based additives improve the surface properties of nylons, acrylates and polycarbonate.

"Organoton macht kratzfest"

David Evans. Grant Edwards. Richard Marshall.
Kunststoffe, Pages 68-71, 1/2017.
Modifizierte Additive auf Tonbasis verbessern die Oberflacheneigenschaften von Polyamiden, Acrylaten und Polycarbonat.

"No Hard Coating Needed"

Richard Marshall.
Plastics Technology, Pages 42-45, December 2016.
Now there is an additive that improves scratch/mar resistance in molded and extruded parts.

Peer-reviewed journal articles

Organization of mixed dimethyldioctadecylammonium and choline modifiers on the surface of synthetic hectorite

Yosephine Andriani, Kevin S. Jack, Elliot P. Gilbert, Grant A. Edwards, Tara L. Schiller, Ekaterina Strounina, Azlin F. Osman and Darren J. Martin.
Journal of Colloid and Interface Science, Volume 409, Pages 72-79, November 2013.
In segmented thermoplastic polyurethane nanocomposites, dual-modified organoclays have shown significantly better performance compared to their single-modified counterparts. This work examines the organization of mixed surfactant self-assembly on the surface of organoclays. When synthetic hectorite was modified with mixed polar and nonpolar surfactants, nonpolar domains were observed to self-assemble at the clay surface, enabling enhanced interactions with the nanoscale domains of these thermoplastic elastomers.

In vitro biostability of poly(dimethyl siloxane/hexamethylene oxide)-based polyurethane/layered silicate nanocomposites

Yosephine Andriani, Isabel C. Morrow, Elena Taran, Grant A. Edwards, Tara L. Schiller, Azlin F. Osman, Darren J. Martin.
Acta Biomaterialia, Volume 9, Issue 9, Pages 8308-8317, September 2013.
This research demonstrates significant improvements in oxidative resistance in silicon-based TPU nanocomposites incorporating dual-modified organoclays.

Engineered nanofillers: impact on the morphology and properties of biomedical thermoplastic polyurethane nanocomposites

Azlin F. Osman, Yosephine Andriani, Grant A. Edwards, Tara L. Schiller, Kevin S. Jack, Isabel C. Morrow, Peter J. Halleyad and Darren J. Martin.
RSC Advances, Issue 2, Pages 9151-9159, August 2012.
The incorporation of dual modified organoclays as the nanofiller successfully enhanced the tensile strength, toughness and tear strength of siloxane-based thermoplastic polyurethane. This is due to the presence of dual surfactants, which form regions of higher and lower surface energy on the layered silicate surface, thus enabling molecular interactions between the organoclays and both the hard and soft TPU segments.

Structure–property relationships in biomedical thermoplastic polyurethane nanocomposites

Azlin F. Osman, Grant A. Edwards, Tara L. Schiller, Yosephine Andriani, Kevin S. Jack, Isabel C. Morrow, Peter J. Halley, and Darren J. Martin.
Macromolecules, Volume 45, Issue 1, Pages 198-210, 2012.
This study investigates siloxane-based thermoplastic polyurethane nanocomposites containing synthetic layered silicates as new insulation materials with superior tensile and tear strength and reduced surface tack, potentially allowing for thinner insulation and more intricate electrode designs. In this work, TPU nanocomposites reinforced with low aspect ratio organo-hectorite and high aspect ratio organo-fluoromica were prepared by solvent casting. It was found that the hydrophobic low aspect ratio organo-hectorite demonstrated vastly superior mechanical properties when incorporated in the TPU matrix at 2 wt% loading. These nanosilicates are therefore shwon to be readily capable of orientation and reinforcement and also serve to provide more cohesive hard microdomains and thus creep resistance and dimensional stability.

Effect of the average soft-segment length on the morphology and properties of segmented polyurethane nanocomposites

Bradley Finnigan, Peter Halley, Kevin Jack, Alasdair McDowell, Rowan Truss, Phil Casey, Robert Knott, Darren Martin.
Journal of Applied Polymer Science, Volume 102, Issue 1, Pages 128–139, October 2006.
This work shows the relationship between size of nanoparticle and the microphase within a thermoplastic polyurethane resulting in different levels of reinforcement via secondary bonding.

Segmented polyurethane nanocomposites:  impact of controlled particle size nanofillers on the morphological response to uniaxial deformation

Bradley Finnigan, Kevin Jack, Kayleen Campbell, Peter Halley, Rowan Truss, Phil Casey, David Cookson, Stephen King and Darren Martin.
Macromolecules, Volume 38, Issue 17, Pages 7386-7396, July 2005.
This research looks at TPU nanocomposites incorporating organically modified layered silicates with controlled particle size. Improved tensile properties in the nanocomposites were found to result from nanoparticles aligning in the strain direction and interacting with the TPU sequences via secondary bonding. This effect is shown to be more pronounced in smaller silicate platelets.

Morphology and properties of thermoplastic polyurethane composites incorporating hydrophobic layered silicates

Bradley Finnigan, Darren Martin, Peter Halley, Rowan Truss, Kayleen Campbell.
Journal of Applied Polymer Science, Volume 97, Issue 1, Pages 300–309, July 2005.
This work investigates the morphology and properties of thermoplastic polyurethane incorporating Cloisite 15A prepared via melt-compounding and solvent-casting.

Book Chapters

Commercialization of Nanotechnology: The five critical success factors to a nanotech-enabled whole product

C. Belcher, R. Marshall, G. Edwards, D. Martin.
In T.Tsuzuki (Ed.), Nanotechnology commercialization, 2013 (p.171-204). Australia: Pan Stanford Publishing.

Thermoplastic polyurethane (TPU)-based polymer nanocomposites

D. J. Martin, A. F. Osman, Y. Andriani, & G. A. Edwards.
In F.Gao (Ed.), Advances in polymer nanocomposites: types and applications, 2012 (p.321-350). Cambridge, UK, Woodhead Publishing.

Toxicity and regulatory perspectives of carbon nanotubes

D. Martin, M. Belkina, A. Milev, G. S. Kamali Kannangara, & R. F. Minchin.
In T. McNally and P. Pötschke (Eds.), Polymer carbon nanotube composites: Preparation, properties and applications, 2011 (p.621-653). Cambridge, UK, Woodhead Publishing,

Composites of poly(ethylene terephthlate) and carbon nanotubes.

K. McCrossan, C. McClory, B. Mayoral, D. Thompson, T. McNally, M. Murphy, T. Nicholson, D. Martin & P. Halley.
In T. McNally and P. Pötschke (Eds.), Polymer-carbon nanotube composites: Preparation, properties and applications, 2011 (p.545-585). Cambridge, UK.: Woodhead Publishing.

Thermoplastic polyurethane nanocomposites.

S. K. Smart, G. A. Edwards, & D. J. Martin.
In S. Thomas and R. Stephen (Eds.), Rubber nanocomposites: Preparation, properties and applications. Wiley, Editors, 2008