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n.1.(Chem.) A hypothetical hydrocarbon, C5H10, metameric with the amylenes, and the nucleus of a large number of derivatives; - so named because regarded as composed of five methylene residues. Cf. Trimethylene, and Tetramethylene.
References in periodicals archive ?
Covestro, for instance, is developing resins based on pentamethylene diisocyanate (PDI), its new biobased aliphatic isocyanate, and C[O.
Synthesis of Dialdehyde (A-1, A-2, A-3, A-4, A-5 and A-Ar) Dimethylene 1,2-bis(4-oxybenzaldehyde) (A-1), Tetramethylene 1,4-bis(4-oxybenzaldehyde) (A-2) , Pentamethylene 1,5-bis(4-oxybenzaldehyde) (A-3), Hexamethylene 1,6-bis(4-oxybenzaldehyde) (A-4), Octamethylene 1,6-bis(4-oxybenzaldehyde) (A-5) and Phenylene 1,4-bis[methylene(4- oxybenzaldehyde) (A-Ar) were synthesized according to the reported method.
At the European Coatings Show, Bayer MaterialScience is showcasing a milestone in this field: Pentamethylene diisocyanate (PDI) is a new isocyanate, 70 percent of whose carbon content comes from biomass without generating any direct competition for food production.
1990)] n = 5 and m = 7 Polyhexamethylene- 1850 (c) -63 pentamethylene carbonate diol (PHMPMCD) 4,4'-Diphenylmetane diisocyanate 250 -- (MDI) 1,4-Butanediol (BD) 90 -- [T.
Dinitroso pentamethylene tetramine (DNPT) and azodicarbonamide (ADCA) are two of the less toxic blowing agents, but poorer cell structure and less consistent physical properties are likely to result from their use.
The big breakthrough in chemical blowing agents for closed cell sponge came in 1946 with the introduction of Vulcacel BN, dinitroso pentamethylene tetramine (refs.