| 释义 |
acetal Chem.|ˈæsɪˌtæl|
[f. acetic) + alcohol).]
1. A colourless liquid with alcoholic smell, found among the first portions of the distillate in preparing spirit of wine; a derivative of aldehyde, converted by oxidizing agents into acetic acid. It is the diethylate of ethylidene or ethidene CH3—CH(OC2H5)2.
1853Ure Dict. Arts (ed. 4) I. 1 Acetal, is the subacetate of ether, having for its chemical symbol 3AcO + AcO3. It is a light colourless ethereous liquid. 1869Roscoe Elem. Chem. 250 Acetal is isomeric with diethyl glycol.
2. Sometimes extended to analogous ethidene derivatives in other series of the hydrocarbons, as dimethyl acetal, found in crude wood-spirit; also called ethidene dimethylate, CH3—CH(OCH3)2. In this nomenclature, the preceding substance is distinguished as diethyl acetal.
Add:3. = polyoxymethylene s.v. poly- 2 c.
1957Materials & Methods XLV. 153 Called Delrin acetal resin, the polymer is still in an early stage of development. 1986Early Music Aug. 419/3 (Advt.), A harpsichord jack... Made in low friction acetal (similar to Delrin). 1990New Cyclist Summer 47/1, 90{pcnt} of the freewheel is plastic, a very durable, rigid polymer known as Acetal. |