AAA Daily Fuel Gauge Report for Friday, 9/3/21
National Average Price for Regular Unleaded Current: $3.184; Month Ago: $3.182; Year Ago: $2.232. National Average Price for Diesel Current: $3.290; Month Ago: $3.289; Year Ago: $2.429.
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From Cellulose to 3D Objects: 3D printing with a biobased polymer for CO2-neutral manufacturing
In our modern world, eliminating plastics is inconceivable. Unfortunately, they do have disadvantages, including the formation of CO2 in both production and combustion, depletion of fossil feedstocks, and growth of landfills. In the journal Angewandte Chemie, Russian researchers introduce a new way forward, a polymer made entirely from biomass that can easily and inexpensively be used in 3D printing. Objects produced in this way are of high quality, easily recyclable, and highly solvent-resistant.
Conventional “subtractive” processes involve cutting, sawing, turning, or milling, which results in a great deal of wasted material. In contrast, 3D printing processes are, in principle, waste-free, because they are “additive”: three-dimensional objects are produced in a layer-by-layer application of material. The most common technique is called fused deposition modeling (FDM). In this process, the raw material is squirted through a hot nozzle onto a mobile base and thereby liquefied (extrusion). The printer head produces the programmed form like in a conventional two-dimensional printing process, releasing small amounts of the polymer instead of ink. This is repeated for layer after layer until the desired three-dimensional object is complete. Yet, the polymers used until now have a number of disadvantages that limit their use. Some of the polymers are attacked by organic solvents. Those that withstand the solvents, on the other hand, adhere poorly and shrink on heating, allowing their layers to come apart and causing errors in the printing process. Click Read More below for additional information.
Oil Trades Near $57 as Saudis Boost Security at Crude Facilities
Futures were little changed in New York after falling 0.8 percent Friday. Prices still capped a fifth weekly gain last week, the longest run since October 2016. The plan to boost security was reported by Al-Arabiya television on Saturday, citing the energy ministry of Saudi Arabia, the world’s top crude exporter. The pipeline resumed pumping later in the day after a brief halt. Oil has climbed about 20 percent since the start of September as global supplies tighten and speculation mounts that the Organization of Petroleum Exporting Countries will extend output curbs past the end of March. In the U.S., drillers last week increased the rig count by the most since June, according to Baker Hughes. “Political developments in Saudi Arabia sent bullish ripples across the energy complex,” said Stephen Brennock, an analyst at PVM Oil Associates Ltd. in London. Click Read More below for additional information.