Polyurethane foam (PUF) is an outstanding material for various applications, which is manufactured by propelling liquid isocyanate-polyol mixture to form foams in the presence of blowing agent. In order to reduce the ozone depletion and environmental pollution from organic blowing agents, waterblown PU foams were prepared with various water levels (311phr), and the effects of water level on mec...

In the present study, Streptomyces gulbargensis and its mutant form, S.gulbargensis mu24, immobilized on polyurethane foam were investigated for the production of L-asparaginase using groundnut cake extract as medium. The medium with an initial pH of 8.5 was inoculated with free and immobilized cells separately and then subjected to fermentation by incubation at 40oC and shaking at 200 rev/min....

An injury to the skin resulting in a wound starts the complex healing machinery of the body, normally leading to rapid wound closure. In some cases the normal wound healing process is disturbed and prolonged; which can lead to chronic, non-healing wounds such as venous leg ulcers. Chronic wounds in general are estimated to affect 1 – 2 % of the world’s population, and about 1 % is suffering fro...

Silver nanoparticles can be coated on common polyurethane (PU) foams by overnight exposure of the foams to nanoparticle solutions. Repeated washing and air-drying yields uniformly coated PU foam, which can be used as a drinking water filter where bacterial contamination of the surface water is a health risk. Nanoparticles are stable on the foam and are not washed away by water. Morphology of th...

Abstract Nanofiller reinforcing agents can significantly improve the strength and modulus of polymer foams. But these improvements are often accompanied by changes in foam density (or equivalently the expansion ratio or void volume). The efficacy of nanofillers as reinforcing agents can only be judged once the density differences are accounted for. We review the literature and show that represe...

Front Cover: The structure of isocyanate contains unsaturated bonds and has high activity. It easily reacts with some organic or inorganic substances active groups. In the preparation polyurethane foam, a porous foam can be generated by reacting radicals hydroxyl compound in plant-based polyol. This is reported Shuming Chen co-workers, article number 2000075.

ISHS II International Symposium on Growing Media, Soilless Cultivation, and Compost Utilization in Horticulture Experimental design as a framework for optimising polyurethane foam soilless growing media

Polyurethane closed cell (PUCC)/SiO2 nanocomposites have been prepared by using in situ polymerization approach. The third-order optical nonlinearities of PUCC/SiO2 nanocomposites, dissolved in DMF are characterized by Z-scan technique at the measurement wavelength of 532 nm. The nonlinear refractive (NLR) indices and nonlinear absorption (NLA) coefficients of samples were calculated from close...

In thermal characterization tests of bone cement according to the ASTM Standard Specification for Acrylic Bone Cement, time-temperature profiles of bone cement were observed to be sensitive to the thickness of the cement patty and the mold material. Due to the heat transfer from cement to the surrounding mold, such tests might underestimate the exothermic temperature of bone cement. Developing ...