Temperature dependence of compression of natural rubber-sulfur vulcanizates of high sulfur content

Dir Anqcw.andr~* Mu&romolt.kularr Chrmir 36 f I Y 7 4 ) I -16 ( N r . 4 9 7 )From the Dunlop-Forschungslaboratorium. SUMMARY:Powders from HAF-black/SBR mixtures in the total range of composition from 0 to 100% SBR were prepared by spray-drying mixtures of aqueous dispersions of HAFblack and SBR.Application of static pressure up to 19 kbar to these HAF-blackiSBR powders at room temperature yielded coherent specimens which in many respects behaved likc vulcanized HAFISBR compounds.The modulus-pressure, modulus-temperature. swelling and solubility bchaviour of these systems was studied. The torsional modulus which was measured betwecn -100 and H. Schilling, G. Angerer, and T. S. Ng wurde aus der Gleichgewichtsquellung in Toluol ermittelt. Es wurde gefunden, daD die schcinbare Vernetzungsdichtc sowohl mit stcigendem RuBgchalt als auch mit steigendem Herstellungsdruck der Proben ansteigt.Die Anwendung einer Theorie von Vergnon uber die Druckabhgngigkeit des Kompressionsmoduls von Metallpulvern auf HAF-RulJ gestattete die Berechnung der Dichte des HAF-Rubes unter optimalen Packungsbedingungen zu 2, OO g/cm3.

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Pressure–volume–temperature behavior of high density polyethylene

Foster

Waldman

Griskey

1966

J of Applied Polymer Sci

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SynopsisEquilibrium pressure-volume-temperature behavior in both the solid and molten regions was determined for a high density ( p = 0.958 g . /~m .~) polyethylene. Data were measured with a recently developed compressibility device capable of obtaining precibe and accurate data. Residual curve treatment showed that the data were true equilibrium data. Compressibilities calculated from the data of this work compared favorably to existing data which were limited to 205°C. The present work extended the compressibility behavior to 250OC. It was also found that differences in compressibility of low and high density polyethylenes were not eliminated in the molten region, indicating that the effect of differences in morphology was not eliminated. The Spencer-Gilmore equation was fitted to the data of the present work. The internal pressure (a) term of the equatiou showed a definite relation to polymer morphology.

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Temperature dependence of compression of natural rubber-sulfur vulcanizates of high sulfur content

Cited by 17 publications

References 2 publications

PVTRelationships and Equations of State of Polymers

PVTRelationships and Equations of State of Polymers

The effect of pressure on carbon‐black/elastomer powders. Part II: Modulus and swelling measurements on HAF‐black/SBR‐powders at pressures up to 19 kbar

Pressure–volume–temperature behavior of high density polyethylene

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