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Citation: HU You-Mo, HUANG YONG-YAN. A STUDY OF THE EFFECT OF SOME FACTORS ON THE IONIC DEPOSITION OF NATURAL RUBBER LATEX[J]. Acta Polymerica Sinica, ;1965, 7(3): 160-170. shu

A STUDY OF THE EFFECT OF SOME FACTORS ON THE IONIC DEPOSITION OF NATURAL RUBBER LATEX

Received Date: 5 March 1964

A study has been made of the influences of some factors (types and concentration of coagulants，etc) upon the ionic deposition of natural rubber latex with coagulants．It was found that the rate of deposition varied with the types of coagulants，in the order of calcium chloride>calcium nitrate>calcium acetate>barium chloride>barium acetate．The mechanical properties of wet-·gel and dry-film with barium acetate were quite good．The ageing characteristics of dry—film deposited with calcium salts were poorer than that with barium salts．especially for the chlorides．The amount of ionic deposition，the initial concentration of wet—gel，and the mechani-cal properties of wet-gel increased with the concentration of coagulant． But when cal-cium chloride was used，the mechanical properties of wet-gel attained a maximum at a concentration of 15％．During the ionic deposition，the concentration of wet-gel was found to decrease at first and then a slight increase after the minimum value was reached．The properties of wet-gel underwent similar changes．Both the deposition method and the carrier of coagulant had pronounced effects upon ionic deposition．According to the above results．the ionic deposition of natural rubber latex can be considered to be proceeding in three stages：(a)coagulation；(b)the transition stage；(C)gelation．From the experimental data，we are able to prove that the Sandomirskii’s kinetic equation of ionic deposition is a reasonable one；but it is probably better to express the whole course of ionic deposition by an empirical equation of the type.
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