Abstracts of Technical Articles by Bell System Authors (01 October 1944)

Elec. Engg., Transactions Section, March, 1944. Proc. I. R. E., July, 1944. Indus. & Engg. Chem., August, 1944. 458 ABSTRACTS OF TECHNICAL ARTICLES 459 lower-molecular-weight fractions were soft and sticky. 

The tensile strength of vulcanizates from the high fraction was somewhat greater than that of the whole polymer, but the modulus was considerably increased. For the low-molecular-weight polymer both tensile and modulus values were much lower. Vulcanizates prepared by mixing natural rubber and gutta-percha hydrocarbons show lower strength than either of the hydrocarbons separately tested in the same formula.