X-Ray Diffraction Study of Some Synthetic Rubbers at Low Temperatures

Some Fatigue Properties of Rubber Blends

“…To illustrate, the +50 to +125% strain cycle shows a much lower life for SBR than the natural rubber. This is probably due to strain orientation or a tendency of the natural rubber to crystallize, a characteristic that SBR does not exhibit except under special [5,6,7,8]. This graph summarizes the work reported previously with this type of sample [1 ] .…”

“…If orientation or crystallization is the explanation of the high fatigue life of natural rubber at liigh initial strains, it's very hard to ignore the fact that perhaps this OESBR is crystallizing and, of course, BR is known to crystallize readily on stretching. However, SBR has been shown to orient or crystallize by several investigators [5,6,7,8]. Furthermore, the latter reference showed the tendency to orient or crystallize increased with increasing molecular weight and OESBR is made from high molecular weight latex.…”

Butadiene Polymers and Polyisoprene - Prepared By Alfin and Emulsion Processes

“…The appearance of the crystalline structure in the Alfin polybutadienes has been observed by other investigators (7). Although a similar structure has been observed for emulsion polybutadienes which were polymerized and exposed for diffraction data at lower temperatures (2), the structure of mutual recipe polymers has not been orderly enough to show crystalline characteristics, except when stretched and exposed for x-ray diffraction data at low temperatures (9).…”

Dilatometric Measurement of Molecular Regularity in Polymers

“…Co.), private communication (Jan. 11, 1945). (8) Kluchesky, E. F. (to Firestone Tire and Rubber Co.), private communication (June 15, 1945).…”