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امروز : یکشنبه, ۱۸ خرداد , ۱۳۹۹  .::.  اخبار منتشر شده : 0 خبر

PolymPart: The bismuth trioxide compound is lightweight, effective at shielding against ionizing radiation such as gamma rays, and can be manufactured quickly. Those qualities make it a promising material for use in applications such as space exploration, medical imaging, and radiation therapy. “Traditional radiation shielding materials, like lead, are often expensive, heavy, and toxic to human health and the environment,” says corresponding author Ge Yang, an assistant professor of nuclear engineering at North Carolina State University. “This proof-of-concept study shows that a bismuth trioxide compound could serve as effective radiation shielding, while mitigating the drawbacks associated with traditional shielding materials.” Researchers ...

In a bid to reduce engine weight and lower manufacturing and assembly costs, the Fraunhofer Institute for Chemical Technology ICT has designed a camshaft module made from fiber-reinforced thermoset polymers. Currently available as a technology demonstrator, the lightweight camshaft module between ICT and the MAHLE Group, along with associated partners Daimler, SBHPP/Vyncolit and Georges Pernoud. Made from a high-strength, fiber-reinforced thermoset polymer, the ICT camshaft module separates the the camshaft from the cylinder head which is still made from aluminium and contains the inlet and exhaust valves. The polymer is able to withstand high temperatures and mechanical and chemical stresses such as those caused by synthetic motor oils and coolants. The ...

Ionic liquids have emerged as a novel class of chemical compound for the development of advanced materials with outstanding potential applications. Although ionic liquids were discovered as early as 1914, it was only in the last two decades that they have received their due attention, as it was recognized that the physicochemical properties could be adjusted over a large spectrum. An ionic liquid is a salt in the liquid state with a melting temperature of less than 100°C (212°F), and composed of paired ions. It is chemically, electrochemically, and thermally stable, usually with a decomposition temperature above 350°C (662°F) and is also considered non-flammable and non-volatile. These compounds can be extensively modified and their properties ...

Asia polymers face more weakness as virus cuts demand
24 مارس 2020

PolymPart: Polymer prices in Asia are coming under further pressure because of a lack of resin demand as the region grapples with the coronavirus pandemic. Polypropylene (PP) and polyethylene (PE) prices have steadily declined since the coronavirus outbreak worsened in January, and the search for a bottom continues. Spot prices of linear low-density PE (LLDPE) […]

Increasing the service life of polymer electrolyte fuel cells with a nanodispersed ionomer
18 فوریه 2020

PolymPart: Protons (subatomic particles) can be transferred from the anode to the cathode through the ionomer membrane in polymer electrolyte fuel cells (PEFC). Scientists can extend proton pathways by impregnating the ionomer (type of polymer) into the electrodes to achieve improved proton transfer efficiency. Since the impregnated ionomer can mechanically bind catalysts within the electrode, […]

Clariant brings medical polymer compounds resistant to hydrolytic degradation
13 فوریه 2020

PolymPart: Clariant recently launched its medical polymer compounds which is known to be resistant to hydrolytic degradation. Clariant Plastics & Coatings Healthcare Polymer Solutions has worked with a leading medical device manufacturer to complete development and testing of new polymer materials specially formulated to resist degradation caused by exposure to high humidity and temperature. The […]

Evonik announces bioresorbable polymer powder for 3D printed medical devices
06 فوریه 2020

Polympart: Evonik has developed a bioresorbable polymer which can be processed on Selective Laser Sintering (SLS) 3D printing equipment. RESOMER PrintPowder The company believes the material, being marketed as RESOMER PrintPowder, is the first of its kind and has been designed to enable the 3D printing of complex bioresorbable medical devices. RESOMER is a 30-year-old brand consisting of more than a dozen […]

Polymer membranes facilitate the exchange of oxygen in the body
04 فوریه 2020

PolymPart: Acute respiratory distress syndrome requires immediate action. In an emergency situation like this, patients are often ventilated using a heart-lung machine. This involves circulating the blood outside the body, adding oxygen and removing carbon dioxide via membranes. A team of researchers at the Fraunhofer Institute for Applied Polymer Research IAP has developed a new […]

Mechanoacid polymer signals a smash hit
18 ژانویه 2020

Stress-induced acid formation shows location and timing of damage Applying pressure to this polymer disk caused acid to be released from the polymer, turning the pH indicator rhodamine B pink within the disk (left). Rhodamine B appears fluorescent yellow under UV light (right). Apolymer that releases acid in response to a hammer blow can trigger […]

Polymer thermal regulator transforms from conductor to insulator and back again
18 دسامبر 2019

Polymers are used to develop various materials, such as plastics, nylons and rubbers. In their most basic form, they are made up of many of identical molecules joined together repeatedly, like a chain. Engineering molecules to join together in specific ways can dictate the characteristics of the resulting polymer. Using this method, Sheng Shen, an […]

Graphene Composite Improves Photocatalytic Activity Used to Degrade Pollutants
14 دسامبر 2019

BERGAMO, Italy, Dec. 13, 2019 — Graphene Flagship partners developed a graphene-titania composite via a one-step procedure to widen and improve the applicability of “smog-eating” cement. The prepared composite showed enhanced photocatalytic activity, degrading up to 40% more pollutants than pristine titania in the model study, and up to 70% more pollutants in the case […]

Mathematician discovers method to simplify polymer growth modelling
13 نوامبر 2019

PolymPart: A mathematician from RUDN University has proven that there are no solutions to functional differential inequalities associated with the Kardar-Parisi-Zhang (KPZ)-type equations, nonlinear stochastic partial differential equations that arise when describing surface growth. The obtained conditions for the absence of solutions will help in studies of polymer growth, the theory of neural networks, and […]

New polymer releases molecular cargo in response to force
09 نوامبر 2019

PolymPart: Caltech scientists have developed a new kind of polymer that can carry a chemical payload as part of its molecular structure and release it in response to mechanical stress. The chemical system they have developed could one day be used to create medical implants that can release drugs into the body when triggered by […]