| 单词 |
polymethylene |
| 释义 |
polymethylene Chem.|pɒlɪˈmɛθɪliːn|
[f. poly- + methylene.]
A compound, group, or polymeric structure which consists of or contains a chain of methylene groups, {b1}(CH2)n{b1}; orig. spec. any of the series of saturated cyclic hydrocarbons of formula (CH2)n. Freq. attrib.
1892Jrnl. Chem. Soc. LXII. 1310 In this paper the author discusses the question of the identity of the naphthenes from Caucasus petroleum and the polymethylenes. Ibid., The naphthenes in general may also include derivatives of other polymethylene rings. 1910N. V. Sidgwick Org. Chem. Nitrogen ii. 21 In the polymethylene derivatives the ring is often affected. 1930Jrnl. Amer. Chem. Soc. LII. 317 Those poly-esters in which the structural units contain polymethylene chains (CH2)x, in which x is greater than 3–5, show great solubility in benzene. 1953R. J. W. Reynolds in R. Hill Fibres from Synthetic Polymers v. 98 Other addition reactions which can give rise to linear polymers are those involving the polymerisation of..diazomethane or diazoalkanes to give polymethylenes or their alkyl substituted products. 1967Margerison & East Introd. Polymer Chem. i. 17 Taking a portion of the polymethylene chain as the simplest case, the configuration..in which the CH2 groups on adjacent carbon atoms are staggered relative to one another is more frequently assumed..than any other. |
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