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.
| 1931 E. 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. 1946 Shell 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. 1961 New 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. 1963 H. 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. 1972 Materials & Technol. V. xiv. 474 Effective peptizers [of rubber] are hydrazine derivatives and organic sulphur compounds like thio-β-naphthol, pentachlor thiophenol, dibenzoyl disulphide. |