STUDY ON QUICK CURING M ETHOD OF POLYSULFIDE RUBBER AT ROOM TEMPERATURE
PART I INVESTIGATIONS ON THE CURING ABILITIES OF METAL OXIDES
1966 Volume 39 Issue 4 Pages 261-265
Details
1966 Volume 39 Issue 4 Pages 261-265
Polysulfide rubber has a special ability to set at room temperature; thereby lead peroxide is commonly used as its oxidizing agent. In this study, increases in its viscosity after the additions of various oxidizing agents are measured, in order to investigate the condensing abilities of the agents from the standpoint of molecular weights. Potassium permanganate is found to display a prominent curing ability.
Furthermore, infrared spectrum absorption measurement is made to observe the decrease of thiol terminals (SH) during reaction, and by means of calculating the approximate values of reaction degree and also poly-condensation degree, the following results are obtained :
1) In the case of employing either 4% mixture of lead peroxide and permanganate or 4% of lead peroxide only, the degree of condensation is 3 to 6.
2) In the case of employing 4% of potassium permanganate, the degree of condensation is about 17, 40 minutes after the beginning of the reaction at the temperature of 35°C.
Comparison between these two cases leads to the recognition that potassium permanganate displays a more prominent condensing ability, which coincides with the result obtained from the investigation on the viscosity.
