A class of polymers whose repeating units are characterized by ester groups and imide groups. It is usually obtained by imidization of polyester amic acid, and has the characteristics of high temperature resistance and good processability. Polyesterimide PEI is extensively…
Polyurethane often abbreviated PUR and PU) refers to a class of polymers composed of organic units joined by carbamate (urethane) links. In contrast to other common polymers such as polyethylene and polystyrene, polyurethane is produced from a wide range of…
Acetal, a general term for a class of organic compounds, is the product of the condensation of one molecule of aldehyde and two molecules of alcohol, such as acetaldehyde diethyl acetal, with a boiling point of 104 °C; benzaldehyde dimethyl…
An Aluminium alloy (or aluminum alloy; see spelling differences) is an alloy in which aluminium (Al) is the predominant metal. The typical alloying elements are copper, magnesium, manganese, silicon, tin and zinc. There are two principal classifications, namely casting alloys…
Aluminum wire is the most common metal in electric power transmission and distribution. Although only 61% of the conductivity of copper by cross-sectional area, its lower density makes it twice as conductive by mass. As aluminum is roughly one-third the…
Polyester is a category of polymers that contain the ester functional group in every repeat unit of their main chain. As a specific material, it most commonly refers to a type called polyethylene terephthalate (PET). Polyesters include naturally occurring chemicals,…