Emulsion polymerization of 2‐alkyl‐1,3‐butadienes.

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Abstract
The polymers of 2‐ethyl‐, 2‐isopropyl‐, and 2‐n‐amyl‐1,3‐butadiene alone, and their copolymers with styrene and with butadiene have been prepared and characterized. These monomers give the same ratio of 1,2 to 1,4 addition as has been noted for isoprene. Much less mercaptan must be used with these monomers than is required for butadiene to give soluble polymers. All these monomers copolymerize with styrene readily but have higher Wall α values than butadiene. The stress‐strain properties and Gehman low‐temperature properties of all of the new polymers have been determined by the Government Laboratories, University of Akron, and are included in this report. There appear to be no unusual properties to be noted.

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