A series of synthetic rubbers was prepared by the emulsion polymerization and copolymerization of myrcene, 2-methyl-6-methylene-2,7-octadiene, derived from turpentine. The polymers and copolymers, all of which were relatively soft, were compounded, milled, and vulcanized, and the vulcanizates were tested for tensile strength and elongation. The polymers obtained from myrcene alone were low in tensile strength and elongation. The copolymers prepared from myrcene and styrene had relatively low tensile strength, generally less than 1200 pounds per square inch, but had ultimate elongations ranging up to 1100%. Tercopolymers prepared from myrcene and styrene with butadiene possessed much higher tensile strengths, ranging up to about 2300 pounds per square inch, and had elongations ranging up to 500%.S ONE phase of a wartime investigation to determine the A possibility of producing synthetic rubbers from turpentine derivatives, the emulsion polymerization and copolymerization of myrcene derived from turpentine have been studied.A process had been previously developed ( d ) for the production of myrcene, 2-methyl-6-methylene-2,7-octadiene, in good yield, by the vapor-phase thermal isomerization of @-pinene, one of the major components of gum turpentine, according to the equation:
A solution method of compounding rubber has been devised. It is particularly suitable for compounding a soft natural rubber such as that recovered from goldenrod, but it does not appear to be restricted to goldenrod rubber. No particular inherent disadvantage of solution compounding is indicated with hevea rubber. By proper choice of solvent and compounding chemicals, the interesting possibility is presented of improving the quality of those rubbers in which proper dispersion of chemicals is difficult. This method also shows possibilities of being a valuable research tool in the pretreatment of soft synthetic elastomers as a preliminary step to evaluation of their rubber-like qualities.
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