TY - JOUR
AU - Sarvadi, G.
AB - Butadiene and butadiene‐styrene have been emulsion polymerized in the presence of carbon black and by use of persulfate initiation. The recipe developed gives 50% conversion of butadiene in about 16 hours, and produces polymers which are superior to conventional ones in processability, ultimate tensile, and elongation. The compounded tensiles are about 1000 p.s.i. higher, while the elongations are higher by 60‐100%. The rates of polymerization at 50°C. are dependent on the type of black used, the type and amount of soap, and the method of preparation of the black dispersion, but they are insensitive to molecular oxygen. However, even the “optimum” persulfate recipe suffers from two serious drawbacks: (1) above 50% conversion the rate of polymerization becomes extremely slow, and (2) the stability of the carbon black in the latex decreases rapidly above conversions of 30%. Even though the precipitated carbon black is easily redispersed by agitation, it is inconvenient to work with latices which are so unstable colloidally. These difficulties could not be circumvented in polymerization systems containing persulfate as the initiator.
TI - Emulsion polymerization of butadiene and styrene in presence of carbon black. I. Persulfate initiation
JO - Journal of Polymer Science Part A Polymer Chemistry
DO - 10.1002/pol.1956.120199103
DA - 1956-01-01
UR - https://www.deepdyve.com/lp/wiley/emulsion-polymerization-of-butadiene-and-styrene-in-presence-of-carbon-kKRpiXVOOB
SP - 29
EP - 38
VL - 19
IS - 91
DP - DeepDyve
ER -