| 单词 |
peptizer |
| 释义 |
peptizer Chem.|ˈpɛptaɪzə(r)|
[f. peptize v. + -er1.]
A substance which causes peptization, or which serves to prevent the coagulation of a colloid suspension; spec. a catalyst which facilitates the process of mastication or vulcanization of rubber, by preventing the recombination of broken polymer chains.
1931E. S. Hedges Colloids iii. 16 If the freshly precipitated ferric hydroxide is treated with..ferric chloride solution it disperses immediately to form a dark reddish-brown colloidal solution. We call..ferric chloride the peptizer or peptizing agent. 1946Shell Aviation News No. 100. 15/3 These [sc. additives in oil]..may act as ‘peptizers’ which help to keep in suspension in the oil any insolubles which are formed. 1961New Scientist 2 Mar. 549/1 Other substances, so called ‘peptisers’, can be added [to rubber] to ensure this simple form of stabilizing the reactive ends of the broken chains. 1963H. van Olphen Introd. Clay Colloid Chem. viii. 109 When a small amount of peptizer is added to a pure clay gel, the yield stress decreases drastically. 1972Materials & Technol. V. xiv. 474 Effective peptizers [of rubber] are hydrazine derivatives and organic sulphur compounds like thio-β-naphthol, pentachlor thiophenol, dibenzoyl disulphide. |
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