Ultrafiltration Equipment Usig Hollow Fibres and Areas of Application.

Researchers developed a process for the manufacture of hollow polysulfone fibers with an asymmetric structure. Important properties in their application as ultrafiltration membranes were a retentivity of 20 kilodaltons and a distilled water ultrafiltration rate of 94-125 liters per square meter per hour at a transmittance pressure of 0.1 ..

Biodegradable Polyurethane Sheet Derived from Waste Cooking Oil.

A study to evaluate the use of waste cooking oil from the food industry as polyols for the manufacture of biodegradable polyurethane assessed the effects of casting conditions, isocyanate to hydroxyl group (NCO/OH) ratio, amount of oil, and additives on polyurethane sheets. Optimal processing conditions included blending 30 pbw oil, 70 pb..

Biodegradable Polymer in Seed Protein from Corn.

Prolamine, the alcohol soluble fraction of corn seed, is known as zein. Researchers determined the thermal properties of zein films cast from aqueous ethanol and methanol. Differential scanning calorimetry determined that all water evaporated from the films at 100 degrees centigrade. The glass transition occurred at 165 degrees centigrade..

Techniques and Mechanisms of Polymer Degradation

An overview of polymer degradation techniques and mechanisms of focuses on inert and degradable polymers, chemiluminescence measurements of polymer oxidative changes, and chromatographic analyses of low molecular weight compounds in polymers. Most bulk polymers are inert in character or have antiageing compounds added during manufacture. ..

Functionalized Polysiloxanes as Fine Dispersants for Metal Particulates.

Research on functionalized polysiloxanes as fine dispersants for metal particulates synthesized poly(dimethyl-co-methyvinyl)siloxane, phosphine containing polysiloxanes, phosphine oxide containing polysiloxanes, and silica coated AIN filled poly(3-cyanopropylmethy)siloxane networks. These polar polysiloxane microcomposite networks had dif..

Electrorheological Behavior of the Suspension Based on Chitosan Succinate as the Disperse Phase

Electrorheological fluids consist of polarizable particles in an insulating media. Particle formation upon application of an electrical field characterizes electrorheological mechanisms. Different problems associated with these fluids include dispersion stability, durability, corrosion, abrasion, and a limited temperature range in use. Th..

An Overview of Biodegradable Polymers and Biodegradation of Polymers.

An overview of biodegradable polymers addresses biomedical polymers and biodegradable polymers in polymer waste management. Polymer biodegradation proceeds via hydrolysis and oxidation. Most biodegradable manmade and natural polymers contain hydrolyzable groups along the main chains, which control stereoconfiguration, hydrophobicity and h..

Degradable Polymers: Principles and Applications.

An overview of degradable polymers and plastics addresses carbon chain polymer abiotic degradation, polymer biodegradation mechanisms, aliphatic polyester biodegradation, properties of bacterially derived polyhydroxyalkanoates, starch polymer composites, polymer composite degradation engineering, ethylene carbon monoxide copolymers, photo..

Overview of Textile Polyamide Thread Processes.

Nylon fibers account for 20 percent of the world manmade fiber market. The raw yarn manufactured via melt extrusion must be homogeneous and achieve precise specifications to ensure optimal quality. Melt extruders must be adaptable to different filament specifications operate at high production speeds, and be easily maintained and operated..

kraft Pulping of Eucalyptus globulus: Kinetics of Residual Delignification.

A kinetic model for residual delignification in Eucalyptus globulus kraft pulping revealed a mean value for lignin conversion at the transition between bulk and residual delignification of 95.5 percent for pulping at temperatures of 150-180 degrees centigrade and hydroxide ion concentrations of 0.7-1.6 moles. Pulping conditions determined..