You should not charge your smartphone at night. Free Technical Library News

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Do not charge your smartphone at night

24.12.2019

Experts say that gadgets that are left connected to the charger all night still reduce battery life faster.

Experts assure that if the mains adapter is left connected to a fully charged smartphone, this leads to a faster change in the chemical composition of the battery, which negatively affects both its service life and the rate of discharge. Battery degradation, experts say, occurs despite the fact that major smartphone manufacturers install overcharge protection.

In addition, they note the recommendation of device manufacturers to keep the battery within 30-50 percent, even when the gadget is not in use. A 100 percent charge, as well as a complete discharge, are equally harmful to the battery. However, some experts believe that this thesis is outdated, because it does not take into account modern technologies for the production and optimization of batteries. When the smartphone battery reaches 100% charge, the charger stops supplying current, experts explain.

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New life for polyurethane waste 04.09.2019

A team from the University of Illinois (USA) has developed a method for breaking down polyurethane, which allows it to be turned into other useful products. The scientists presented the results of their work at the National Meeting of the American Chemical Society.

Polyurethane is a plastic polymer material. It is found in many objects around us: in paints, car parts, furniture padding, home insulation materials. As they fall into disrepair, these items are sent to landfill and incinerated - releasing toxic by-products. The composition of polyurethane includes two components that are difficult to destroy: isocyanates, which are composed of nitrogen, carbon and oxygen; and alcohol groups called polyols.

"Polyols are usually petroleum-based and non-degradable," said graduate student Ephraim Morado, who developed the technology with his supervisor, Steven Zimmerman. To solve this problem, the team included in the polyol a chemical unit that breaks down more easily, acetal. And because polyurethanes are water resistant, the researchers invented an acetal unit that decomposes in water-free solvents.

The scientists added a combination of trichloroacetic acid and dichloromethane to the starting material - as a result, the material swelled and began to decompose rapidly at room temperature. The resulting degradation products can then be redirected to new materials. For example, researchers have been able to turn elastomers - a type of polyurethane used in rubber bands, packaging and car parts - into adhesives.

The authors of the new technology are also testing it on other polyurethane materials. They also plan to experiment with milder solvents such as vinegar to break down the polyurethane.

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