practical applications of conducting polymers such as polyaniline as membranes are particulary limitedbecause of their poor mechanical properties. however by mixing polyaniline with some conventional insulatingpolymers such as nylon and preparation composite films through solvent casting or blending, it seems to be asuitable way in order to increase the mechanical properties of the conducting p...

Introduction Glass Ionomer Cements (GIC) are widely used dental materials. They adhere to hard dental tissues, release fluoride ions and are bio-compatible [ 11. GIC are obtained from the reaction during the hardening process between a polymeric acid and acid-degradable glass. Water plays a crucial role in this reaction; its absence retards or prevents the reaction while high concentrations res...

"Fragile" glassy materials, which include most polymeric materials and organic liquids, exhibit a steep and super-Arrhenius dependence of relaxation time with temperature upon the glass transition and have been extensively studied. Yet, a full understanding of strong glass formers that exhibit an Arrhenius dependence on temperature is still lacking. In this work, we have investigated the glassy...

Many modern and future technological applications involve ultrathin polymer films with a thickness below the 100-nanometer scale, where statistical bulk averaging is jeopardized and interfacial constraints dictate transport properties. In such confined polymeric systems, transport properties strongly depend on molecular relaxation and structural phases that deviate from the bulk. This is partic...

T he glass transition, in which materials become so viscous that they cannot flow even on extremely long time scales, has baffled scientists for over one hundred years. Experiments have shown that the viscosity can increase in atomic and polymeric liquids by more than 15 orders of magnitude—think of going from the viscosity of water to that of asphalt—over a narrow range of decreasing temperatu...

The application of a modified Simon-Glatzel-type relation [Z. Anorg. Allg. Chem. 178, 309 (1929)] for the pressure evolution of the glass temperature is presented, namely, Tg(P)=Tg0[1+DeltaP/(pi+Pg0)]1/bexp[-(DeltaP/c)], where (Tg0,Pg0) are the reference temperature and pressure, DeltaP=P-Pg0, -pi is the negative pressure asymptote, b is the power exponent, and c is the damping pressure coeffic...

A novel approach for characterisation of nanoclay dispersion in polymeric composites using electron microprobe analysis (EMPA) is presented. Dispersion analysis was performed on three sets of centre-gated discs fabricated by resin transfer moulding. The first set was neat epoxy polymer without reinforcement, whereas the second set comprised 17 vol.-% randomly oriented chopped glass fibre prefor...

Abstract. Glass façades are often required to withstand against explosive events due premeditated or accidental causes. Laminates made by glass plies bonded thin polymeric foils (laminated glass) need be used avoid catastrophic breakage. The paradigmatic case study considered is that of a rectangular three-layer laminate, two plies, modelled as Kirchhoff-Love plates, sandwiching viscoelastic in...

bis(indenyl)zirconium dichloride as a catalyst was synthesized using a modified method at the room temperature. polymerization of ethylene and copolymerization of ethylene and propylene were carried out by this metallocene catalyst. ethylene propylene (p/e) feed ratios of 0.25, 0.5, 1, and 2 were employed into the copolymerization systems. copolymerization conditions like cocatalyst/catalyst ra...

Metallic glasses are amorphous materials that possess unique mechanical properties, such as high tensile strengths and good fracture toughnesses. Also, since they are amorphous, metallic glasses exhibit a glass transition, and at temperatures above this glass transition, they soften dramatically and are therefore amenable to net-shape thermoplastic forming processes. This combination of superio...