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Today's KNOWLEDGE Share: Why do we fail so often to predict brittle failure ? Shear (or compression by the way) cannot promote cavitation and crack. It may however trigger Yielding and ductile failure, which we predict often correctly by looking at the equivalent Von Mises stress (a sort of average shear load) and compare to Yield. Brittle failure is initiated when our load is not trying to change the sample shape (like shear does) but rather the sample volume, more specifically in tension. If we fail to scrutinize the level of so-called "triaxiality", as described by the 3 Principal Stresses, brittle failure may go unpredicted. This is why, in our industry, we suffer from severe customer complaints or liabilities, usually related to "unexpected" brittle failure in the field. Source:Vito Leo Visit MY BLOG http://polymerguru.blogspot.com #plastics #failure #brittle

NOVA Chemicals Corporation (“NOVA Chemicals”) has made a significant expansion of its Circular Solutions business by announcing an investment into developing its first mechanical recycling facility in Connersville, Ind. The facility will process post-consumer plastic films to produce the company’s SYNDIGO™ recycled polyethylene (rPE) at commercial scale as early as 2025, delivering over 100 million pounds of rPE to the market by 2026. NOVA Chemicals plans to expand its recycling footprint over the next several years to help it reach its industry-leading 2030 ambition of 30 percent recycled content as a share of its total polyethylene sales. Area with Access to Abundant Feedstock Supply The company recently announced its 2030 Roadmap to Sustainability Leadership aspirations, including its anticipated investment of between US$2-4 billion by 2030 to expand its sustainable product offerings, decarbonize its assets, and build a state-of-the-art mechanical recycling business while exploring

Barrier coatings producer Melodea has introduced a barrier product specifically engineered to allow for the recyclability of plastic food packaging. Named MelOx NGen, the new barrier has proven superior in its key role of maintaining food freshness and substantially reducing plastic waste. Protects and Extends the Shelf-life of Foods: MelOx NGen is a water-based, plant-sourced coating designed to line the inside surface of numerous forms of plastic food packaging such as films, pouches, bags, lidding, and blister packs used to house CPG products and is currently being rolled out to the global plastic industry. Approved by FDA and BfR as compatible for food contact, the coating helps protect and extend the shelf-life of foods such as snacks, confectionary, nutrition bars, meats, and dairy products as well as pharmaceuticals. Melox NGen is a new iteration of Melodea’s award-winning bio-based and renewable material MelOx for paper packaging but designed specifically for use on plastic. Us

Today's KNOWLEDGE Share: Petrochemicals Historical Timeline 4 1930s New process of alkanisation and fine powder fluid-bed production increases the octane rating of aviation gasoline. 1931 Neoprene invented by DuPont scientists after attending a lecture by Belgian priest and chemistry professor Dr Julius Nieuwland. 1931 German organic chemist Friedrich Bergius and Carl Bosch share a Nobel Prize for their work in high-pressure hydrogenation. 1933 German scientists invent Buna-S, a synthetic rubber made from styrene and butadiene.Mainly used for car tyres. 1933-1935 Plexiglass was discovered by accident by German researcher Otto Röhm. He developed a method for polymerising methyl methacrylate which was intended for use as a drying oil in varnishes but found it could also be used as a coating for safety glass. Plexiglass was manufactured from 1938, used in war planes from 1940 and in car exteriors from 1974. 1933 A white, waxy material, is discovered by accident by two organic chemists

A team of researchers from Japan, led by associate professor Daisuke Suzuki from Shinshu University, develop an innovative way to produce tough and crack-resistant elastic nanoparticle-based latex films without using harmful organic solvents and fillers additives. It is a new class of latex films composed of rotaxane-crosslinked acrylic nanoparticles. These films exhibit remarkable mechanical properties, including excellent crack-propagation resistance without any additives and are easily recyclable, paving the way for more environmentally friendly materials. Interlocking Mechanism in Rotaxane Synthetic latex films, a type of nanoparticle-based films, are widely used across many fields, but they usually contain harmful additives, which are also expensive, to enhance their strength. It is essential to ensure that they are safe, durable and sustainable. This is especially true for synthetic latex films, which are widely used in packaging, biomedicine and electronics. The key to the appro

Today's KNOWLEDGE Share: Why is the maximum shear recorded somewhat inside the skin of molded parts ? Fountain flow brings the material on the walls "sideways". So, the very top skin of a molded specimen is not very oriented at all. Inside the frozen skin (a time/position dependent "moving boundary" line) we get maximum shear and corresponding higher molecular orientation. The "yellow layer" depicted can often be responsible for delaminations of molded parts, since high shear could expel low molecular fractions or lubricants which accumulate under the first formed skin. Low viscosity fractions will naturally move (hydrodynamic forces) to the highest shear-stress regions to minimize total flow energy. Extreme levels of orientation also freeze the material in a lower entanglement state, which can somewhat compromise the interlayer integrity in the thickness direction while boosting in-flow performance. Source:Vito Leo Visit MY BLOG http://polymerguru.blo