| 释义 |
polymethyl|pɒlɪˈmɛθɪl, -miːθaɪl|
[f. poly- + methyl.]
a. polymethyl acrylate (also as one word): a resinous material obtained by polymerizing the methyl ester of acrylic acid.
1936Industr. & Engin. Chem. Oct. 269/2 Polymethyl acrylate is a colorless, transparent substance. 1950Thorpe's Dict. Appl. Chem. (ed. 4) X. 107/1 Polymethyl acrylate is a tough, transparent, and colourless material, highly extensible, and to a limited degree rubber-like. 1973Materials & Technol. VI. viii. 559 The softening point of polymethylmethacrylate lies accordingly about 90 degrees higher than that of polymethylacrylate.
b. polymethyl methacrylate (also as one word): = methyl methacrylate (b) s.v. methyl.
1936Industr. & Engin. Chem. Oct. 270/1 Polymethyl methacrylate is a very hard, tough mass which can be sawed, carved, or worked on a lathe with ease. 1942Endeavour I. 111/2 Cellulose acetate and polymethyl⁓methacrylate are fabricated into cockpit covers..for aircraft by this process. 1960Times 2 Sept. 14/1 They could be eating sandwiches from polyethylene packs with polymethylmethacrylate dentures. 1965Zigrosser & Gaehde Guide to Collecting Orig. Prints vii. 111 The most durable are the acrylic sheets, particularly Plexiglas (polymethyl methacrylate), which is produced in thicknesses from 1·5 to 25·0 mm. 1973[see sense a above]. 1975Sci. Amer. Dec. 96/2 Familiar thermoplastic polymers include polyethylene,..polymethyl methacrylate,..and nylon. |