A method is described for obtaining a quantitative measure of crystalline hydrocarbon present in stretched rubber samples by comparing the intensities of the diffraction spots and the amorphous halo appearing in the x‐ray diagrams. This method has been applied in studying the crystallinity of stretched vulcanized rubber as it is affected by different vulcanization accelerators, and variations in extension, temperature and cure. To illustrate a connection between the physical performance of a rubber vulcanizate and its degree of crystallization, measurements were made on the relation of crystallinity to creep when the rubber was stretched to different initial elongations under constant loads. The creep as a function of the elongation has a maximum value at the same intermediate elongation for which crystallization becomes appreciable. At higher elongations, the increased crystallinity results in a diminution of the creep. The ultimate strength and extensibility generally associated with stretched vulcanize...

An X‐Ray Study of the Proportion of Crystalline and Amorphous Components in Stretched Rubber

diesen Tatsachen angepaBt h~tte. Das w~ire aber nur m6glich gewesen, wenn GOETHE all:f das Studium der met~orologischen Beobachtullgen und der meteorologisehen Literatur viel Zeit verwendet Nitre. Zum Glfick ffir uns hat GOETi~E dazu keine Neigung verspiirt. Denn bet der rastlos fiitigen Natur dieses Mannes hAtte jede intensivere Besch~iftigung mit der Meteorologie ihm die Zeit fiir Arbeiten anderer Art gekfirzt, die seiner Veranlagung mehr entsprachen.

Der Aufbau der hochmolekularen organischen Verbindungen

Über Isopren und Kautschuk. 25. Mitteilung. Über die polymer‐homologen Hydrokautschuke

Über Isopren und Kautschuk, 16. Mitteil.: Über die Konstitution des Kautschuks

/pdf/rontgenometrische-untersuchungen-an-hochpolymeren-3g1idfsyq1.pdf

E. Ott

Papers

Über die Molekülgröße von Kautschuk und Guttapercha