Reactivity ratios for the copolymerisation of vinyl acetate with methyl acrylate have been determined in bulk at 6OoC for conversions smaller than 1 yo using proton magnetic resonance spectroscopy. The values (rma = 6.3 ?L 0.4; rVa = 0.031 f 0.006) thus obtained were compared with the values obtained by other workers using different analytical techniques. The present method appears to be extremely simple and accurate. ZUSAMMENFASSUNG:Die Copolymerisationsparameter des Systems Vinylacetat/Methylacrylat wurden fur die Polymerisation in Masse bei 6OoC und Umsatzen unter 1 % durch Protonenresonanzspektroskopie zu rma = 6,3 f 0,4 und rva = 0,031 ?C 0,006 bestimmt und mit den Werten anderer Autoren verglichen. Die Methode ist einfach und sehr genau.

Thirty-four different vinyl monomers have been synthesized, based on 10-undecenoic acid, pyrolysis product of castor oil, in 50 to 100-g lots in high purity. These include allyl ethers and esters, vinyl ethers and esters, and acrylic and methacrylic esters, all of which were characterized by their infrared spectra; purity was checked by chromatographic methods. Boiling points, refractive indices, and iodine values of the products have been reported.

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The free-radical induced polymerization of a series of acrylic and methacrylic esters of substituted undecanol has been investigated. The effect of various substituents in the chain of undecyl acrylate and undecyl methacrylate on their rates of polymerization has been generalized. The functional groups produce a retarding effect in the order -CeH5 > I > Br > C1> -0CH3. ZUSAMMENFASSUNG:Die durch freie Radikale initiierte Polymerisation der Acryl-und Methacrylsaureester von unterschiedlich in der 10-und 11-Stellung substituiertem Undecylalkohol wurde untersucht. Der EinfluB dieser Substituenten auf die Polymerisationsgeschwindigkeit wurde beschrieben, und zwar verzogern diese Substituenten die Reaktion in der Reihenfolge

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