Polymeric Foams-State of the Art

Characterization of polymeric foams

Mechanical properties of CNT reinforced nano-cellular polymeric nanocomposite foams

Mechanics of CNT-reinforced nano-cellular PMMA nanocomposites are investigated using coarse-grained molecular dynamics simulations. Firstly, static uniaxial stretching of bulk PMMA polymer is simulated and the results are compared with literature. Then, nano-cellular foams with different relative densities are constructed and subjected to static uniaxial stretching and obtained stress-strain cu...

Negative Poisson's Ratio Polymeric and Metallic Foams

Foam materials based on metal and several polymers were transformed so that their cellular architectures became re-entrant, ie. with inwardly protruding cell ribs. Foams with re-entrant structures exhibited negative Poisson's ratios as well as greater resilience than conventional foams. Foams with negative Poisson's ratios were prepared using different techniques and materials and their mechani...

Cell nucleation in solid-state polymeric foams: evidence of a triaxial tensile failure mechanism

The mechanism for nucleation phenomenon in solid-state microcellular foams is identified as a solid-state failure process. This process originates at internal flaws within the gas-polymer matrix, where it is induced by the presence of a state of hydrostatic tensile stress within the polymer matrix. The hydrostatic tensile stress is caused by the presence of the saturating gas within the polymer...

Enzyme Immobilization: The State of Art in Biotechnology

The advantages of immobilized enzyme over its soluble counterpart arise from their improved stability andeasy separation from the reaction media, leading to decrease in production cost. Immobilization methodsrange from adsorption onto matrices, entrapment, cross-linking and covalent bonding to prefabricatedcarriers or activated supports. Changes in kinetic properties of immobi...