The analysis of ac magnetic susceptibility data has shown that mechanically alloyed Fe30Ag40W30 , a highly heterogeneous nanogranular system, exhibits critical dynamics in its transition to a low-temperature spin-glasslike phase, as proved by the power-law divergence of the relaxation time at Tg519.7 K, and by the dynamic scaling behavior of the out-of-phase component of the susceptibility. Bot...

Crystallization of polymeric materials is a solidification process in strong interaction with heat conduction. Both of the basic mechanisms involved in the solidification from a melt, namely the nucleation and growth of crystals, are strongly influenced by the temperature and its variation. Vice versa, the latent heat is rather large for polymeric materials, so that it causes a considerable cha...

this paper is the first multi-scale characterization of the fluidize-dried gum extracted from the fresh fruits of the plant abelmoschus esculentus. it describes the physical, thermal, sorptional and functional properties of this natural gum. elemental analysis, scanning electron microscopy (sem), particle size analysis, x-ray powder diffraction (xprd), thermo-gravimetric analysis (tga), differe...

Through the amide formation between amine-functionalized polyhedral oligomeric silsesquioxane (POSS) and oxygen-containing groups (e.g., epoxy and carboxyl groups) in graphene oxide (GO), we have synthesized POSS-functionalized graphene nanosheets (POSS-graphene), which are highly soluble in various organic solvents attractive for multifunctional applications. Thin films from solution casting o...

mixtures strives to develop a product with good shelf life and that allows efficient dissolution by the end user with minimal change to the properties of the drug. One of the key properties used in the design of the formulations is the glass transition temperature, Tg, which must be sufficiently above the storage temperature to limit any degradation properties from occurring at significant rate...

As a continuation of previous work involving synthesis of an allyl-functionalized hyperbranched polyimide, AT-PAEKI, we have studied the use of this reactive polymer as a modifier of bisphenol-A based bismaleimide resin (BPA-BMI). This was pursued in anticipation of improvements in processability as well as physical properties including glass transition temperature, elastic modulus, and fractur...

We review recent results from computer simulation studies of polymer glasses, from chain dynamics around glass transition temperature Tg to the mechanical behaviour below Tg. These results clearly show that modern computer simulations are able to address and give clear answers to some important issues in the field, in spite of the obvious limitations in terms of length and time scales. In the p...

We study the dynamics of concentrated, long, semi-flexible, unknotted and unlinked ring polymers embedded in a gel by Monte Carlo simulation of a coarse-grained model. This involves the ansatz that the rings compactify into a duplex structure where they can be modelled as linear polymers. The classical polymer glass transition involves a rapid loss of microscopic freedom within the polymer mole...

We explore new routes for characterizing the Debye-like and α relaxation in 2-ethyl-1-hexanol (2E1H) monoalcohol by using low frequency dielectric techniques including thermally stimulated depolarization current (TSDC) techniques and isothermal depolarization current methods. In this way, we have improved the resolution of the overlapped processes making it possible the analysis of the data in ...

The Brillouin elastic free energy change between thermally annealed and quenched (Na2O)x(SiO2)1−x glasses is found to increase linearly for x > 0.23 (floppy phase), and to nearly vanish at x < 0.18 (stressed-rigid phase). The observed (x) variation closely parallels the mean-field floppy mode fraction f (x) in random networks, and fixes the two (floppy, stressed-rigid) elastic phases. In calori...