The damping behaviour of several vinyl polymers-poly(methy1 methacrylate) (PMMA), poly(viny1 chloride) (PVC), polystyrene (PS) and impact polystyrene (Psi)-was studied both as a funtion of temperature and strain amplitude. The measurements were performed from room temperature up to the glass transition temperature and shows amplitude dependence at frequencies of the order of 50 kHz. The data ar...

Exposure to extended periods of sub-Tg temperatures causes physical changes in the molecular structure of epoxy resins and epoxy-based materials to occur. These physical aging mechanisms include the reduction in free volume and changes to the molecular configuration. As a result, mechanical, thermodynamic, and physical properties are affected in ways that can compromise the reliability of epoxy...

Rejuvenation of metallic glasses, bringing them to higher-energy states, is of interest in improving their plasticity. The mechanisms of rejuvenation are poorly understood, and its limits remain unexplored. We use constrained loading in compression to impose substantial plastic flow on a zirconium-based bulk metallic glass. The maximum measured effects are that the hardness of the glass decreas...

We describe an electrospray technique for in situ preparation, for differential scanning calorimetry study, of samples of molecular liquids quenched into the glassy state on extremely short time scales (hyperquenched). We study the cases of a hydrogen-bonded liquid, propylene glycol, PG and a Van der Waals liquid, di-n-butyl phthalate DBP. Using a fictive temperature method of obtaining the tem...

Abstract. Iodine-doped Poly (Ethyl Methacrylate) composites have been prepared using casting method. Global TSDC of the composite samples has investigated TSDC-TS technique. It is found that, global spectra pure PEMA are characterized by two relaxations. The first relaxation which observed as a shoulder in temperature range 324-333 K attributed to motion side group and named -relaxation. Where...

A supercooled liquid is said to have a kinetic spinodal if a temperature Tsp exists below which the liquid relaxation time exceeds the crystal nucleation time. We revisit classical nucleation theory taking into account the viscoelastic response of the liquid to the formation of crystal nuclei and find that the kinetic spinodal is strongly influenced by elastic effects. We introduce a dimensionl...

Results: A total of 247 plastic surgeons were included. 78.6% cited previous work at least once (mean 34.3 +/87.5 self-citations). These self-citations accounted for 4.8% of all citations. Including self-citations in bibliometric analyses increased h-indices from 9.5 +/6.9 to 10.2 +/7.6. A minority of researchers (20.1%) increased their h-index via self-citation by at least one integer value (r...