All Outputs (10)

Processing and properties of PLA-HA nanocomposites: The effect of particle morphology and dispersants (2017)
Conference Proceeding
Tomczynska, M. M., Ward, M., Choong, G. Y. H., Walton, K., De Focatiis, D. S. A., Grant, D. M., …Parsons, A. J. (2017). Processing and properties of PLA-HA nanocomposites: The effect of particle morphology and dispersants. In Proceedings of PPS-32: The 32nd International Conference of the Polymer Processing Society - Conference Papers (150004-1 - 150004-5). https://doi.org/10.1063/1.5016781

Biodegradable polylactic acid nanocomposites for orthopaedic implants require optimum particle dispersion and high molecular weight in load bearing applications. Novel coated hydroxyapatite nanoparticles can offer new opportunities for enhanced dispe... Read More about Processing and properties of PLA-HA nanocomposites: The effect of particle morphology and dispersants.

A model for the compressible, viscoelastic behavior of human amnion addressing tissue variability through a single parameter (2015)
Journal Article
Mauri, A., Ehret, A. E., De Focatiis, D. S., & Mazza, E. (2016). A model for the compressible, viscoelastic behavior of human amnion addressing tissue variability through a single parameter. Biomechanics and Modeling in Mechanobiology, 15(4), 1005-1017. https://doi.org/10.1007/s10237-015-0739-0

A viscoelastic, compressible model is proposed to rationalize the recently reported response of human amnion in multiaxial relaxation and creep experiments. The theory includes two viscoelastic contributions responsible for the sho... Read More about A model for the compressible, viscoelastic behavior of human amnion addressing tissue variability through a single parameter.

High-pressure rheological analysis of CO2-induced melting point depression and viscosity reduction of poly(?-caprolactone) (2015)
Journal Article
Curia, S., De Focatiis, D. S., & Howdle, S. M. (2015). High-pressure rheological analysis of CO2-induced melting point depression and viscosity reduction of poly(?-caprolactone). Polymer, 69, https://doi.org/10.1016/j.polymer.2015.05.026

High-pressure rheology has been used to assess the effects of supercritical carbon dioxide (scCO2) on the melting point (Tm) and viscosity of poly (?-caprolactone) (PCL) over a range of temperatures and pressures up to 300 bar over a wide range of sh... Read More about High-pressure rheological analysis of CO2-induced melting point depression and viscosity reduction of poly(?-caprolactone).

Role of processing history on the mechanical and electrical behavior of melt-compounded polycarbonate-multiwalled carbon nanotube nanocomposites (2015)
Journal Article
Choong, G. Y. H., Lew, C. Y., & De Focatiis, D. S. (in press). Role of processing history on the mechanical and electrical behavior of melt-compounded polycarbonate-multiwalled carbon nanotube nanocomposites. Journal of Applied Polymer Science, 132(8), Article 42277. https://doi.org/10.1002/app.42277

This work investigates the effects of primary compounding temperature and secondary melt processes on the mechanical response and electrical resistivity of polycarbonate filled with 3 wt % multiwalled carbon nanotubes (CNT). Nanocomposites were melt... Read More about Role of processing history on the mechanical and electrical behavior of melt-compounded polycarbonate-multiwalled carbon nanotube nanocomposites.

Time-dependent mechanical behavior of human amnion: Macroscopic and microscopic characterization (2014)
Journal Article
Mauri, A., Perrini, M., Ehret, A. E., De Focatiis, D. S., & Mazza, E. (2015). Time-dependent mechanical behavior of human amnion: Macroscopic and microscopic characterization. Acta Biomaterialia, 11, https://doi.org/10.1016/j.actbio.2014.09.012

Characterizing the mechanical response of the human amnion is essential to understand and to eventually prevent premature rupture of fetal membranes. In this study, a large set of macroscopic and microscopic mechanical tests have been carried out on... Read More about Time-dependent mechanical behavior of human amnion: Macroscopic and microscopic characterization.

The role of deformation history on stress relaxation and stress memory of filled rubber (2014)
Journal Article
Fernandes Arruebarrena, V. A., & De Focatiis, D. S. (2014). The role of deformation history on stress relaxation and stress memory of filled rubber. Polymer Testing, 40, https://doi.org/10.1016/j.polymertesting.2014.08.018

Although the magnitudes of inelastic and viscoelastic effects in filled rubbers are small relative to that of the elastic response, these effects are nevertheless critical in applications such as gaskets, seals and dampers. This study investigates th... Read More about The role of deformation history on stress relaxation and stress memory of filled rubber.

A novel nethod of extraction of blend component structure from SANS measurements of homopolymer bimodal blends (2014)
Journal Article
Smerdova, O., Graham, R. S., Gasser, U., Hutchings, L. R., & De Focatiis, D. S. (2014). A novel nethod of extraction of blend component structure from SANS measurements of homopolymer bimodal blends. Macromolecular Chemistry and Physics, 215(9), https://doi.org/10.1002/macp.201300787

A new method is presented for the extraction of single chain form factors and inter-chain interference functions from a range of small angle neutron scattering (SANS) experiments on bimodal homopolymer blends. The method requires a minimum of three b... Read More about A novel nethod of extraction of blend component structure from SANS measurements of homopolymer bimodal blends.

Viscoelastic melt rheology and time-temperature superposition of polycarbonate – multi-walled carbon nanotube nanocomposites (2013)
Journal Article
Choong, G. Y., De Focatiis, D. S., & Hassell, D. G. (in press). Viscoelastic melt rheology and time-temperature superposition of polycarbonate – multi-walled carbon nanotube nanocomposites. Rheologica Acta, 52(8), https://doi.org/10.1007/s00397-013-0706-6

This work investigates the linear and non-linear viscoelastic melt rheology of four grades of polycarbonate melt-compounded with 3 wt% Nanocyl NC7000 multi-walled carbon nanotubes and of the matching matrix polymers. Amplitude sweeps reveal an earlie... Read More about Viscoelastic melt rheology and time-temperature superposition of polycarbonate – multi-walled carbon nanotube nanocomposites.

A toolbox for parameter-free predictions of solid-state properties of monodisperse glassy polymers with frozen-in molecular orientation (2012)
Journal Article
De Focatiis, D. S., & Buckley, C. P. (2012). A toolbox for parameter-free predictions of solid-state properties of monodisperse glassy polymers with frozen-in molecular orientation. Journal of Polymer Science Part B: Polymer Physics, 50(24), https://doi.org/10.1002/polb.23196

A toolbox that allows designers to predict the properties of oriented glassy polymers using only existing material constants is constructed from a constitutive model applicable to both polymer solids and polymer melts. Two solid-state properties of p... Read More about A toolbox for parameter-free predictions of solid-state properties of monodisperse glassy polymers with frozen-in molecular orientation.

Large deformations in oriented polymer glasses: experimental study and a new glass-melt constitutive model (2010)
Journal Article
De Focatiis, D. S., Embery, J., & Buckley, C. (2010). Large deformations in oriented polymer glasses: experimental study and a new glass-melt constitutive model. Journal of Polymer Science Part B: Polymer Physics, 48(13), https://doi.org/10.1002/polb.22028

An experimental study was made of the effects of prior molecular orientation on large tensile deformations of polystyrene in the glassy state. A new hybrid glass-melt constitutive model is proposed for describing and understanding the results, achiev... Read More about Large deformations in oriented polymer glasses: experimental study and a new glass-melt constitutive model.