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Polyoxymethylene(POM), also known as acetal,[4]polyacetal, and polyformaldehyde, is an engineering thermoplasticused in precision parts requiring high stiffness, low friction, and excellent dimensional stability. Short-chained POM (chain length between 8 and 100 repeating units) is also better known as paraformaldehyde(PFA).
In chemistry, a polyoxometalate (abbreviated POM) is a polyatomic ion, usually an anion, that consists of three or more transition metal oxyanions linked together by shared oxygen atoms to form closed 3-dimensional frameworks. The metal atoms are usually group 6 (Mo, W) or less commonly group 5 (V, Nb, Ta) and group 7 (Tc, Re) transition metals ...
Multiple choice (MC), [ 1 ]objective response or MCQ (for multiple choice question) is a form of an objective assessment in which respondents are asked to select only correct answers from the choices offered as a list. The multiple choice format is most frequently used in educational testing, in market research, and in elections, when a person ...
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Pivaloyloxymethyl (POM, pivoxil, pivoxyl) is a protecting group used in organic synthesis. [1] The POM radical has the formula (CH 3) 3 C-CO-O-CH 2. The POM group is also sometimes used to produce prodrugs. For example, the POM group can be attached to a negatively charged organophosphate group (s) of a drug causing a neutralization of the ...
Pomeranian dog. The Pomeranian (also known as a Pom, Pommy or Pome) is a breed of dog of the Spitz type that is named for the Pomerania region in north-west Poland and north-east Germany in Central Europe. Classed as a toy dog breed because of its small size, the Pomeranian is descended from larger Spitz-type dogs, specifically the German Spitz.
Composite material made of a polymer matrix reinforced with fibres. Fibre-reinforced plastic(FRP; also called fibre-reinforced polymer, or in American English fiber) is a composite materialmade of a polymermatrix reinforced with fibres. The fibres are usually glass(in fibreglass), carbon(in carbon-fibre-reinforced polymer), aramid, or basalt.
Paraformaldehyde (PFA) is the smallest polyoxymethylene, the polymerization product of formaldehyde with a typical degree of polymerization of 8–100 units. Paraformaldehyde commonly has a slight odor of formaldehyde due to decomposition. Paraformaldehyde is a poly- acetal.