ISSN:
0887-6266
Keywords:
polybutadiene
;
polysioprene
;
PVT equations of state
;
pressure-volume temperature-measurements
;
Tait equation
;
theoretical equations of state for polymers
;
glass transition
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
We have performed and analyzed extensive pressure-volume-temperature (PVT) measurements on uncrosslinked polybutadiene and polyisoprene elastomers from ambient temperature to about 200°C and 200 MPa. In the polybutadiene series, 1,2 content varied from 8 to 87%, the remainder being similar amounts of cis-1,4 and trans-1,4. In the polyisoprene series the 3,4 content varied from 8 to 64%, the trans-1,4 content was 12-16%, and the remainder was cis-1,4, with 〈 4% 1,2 content. We report parameters describing the experimental data in terms of the empirical Tait equation, the cell model, the Simha-Som-cynsky equation, the Sanchez-Lacombe, and the Flory-Orwoll-Vrij models. In general the parameters show systematic changes with the microstructure content. The agreement between theory and experiment is excellent for the Tait equation, and also for the Simha-Somcynsky model and the cell model. The maximum deviation between theory and experiment was less than 0.004 cm3/g for the Simha-Somcynsky theory, and less than 0.005 cm3/g for the cell model. Average absolute deviations are three to four times less. For the Sanchez-Lacombe and the Flory-Orwoll-Vrij models, the maximum deviations are 5-8 times as large, and very systematic. Parameter derived from the Simha-Somcynsky theory are discussed with respect to the microstructure, and with respect to the glass transition of these two series of materials. © 1993 John Wiley & Sons, Inc.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/polb.1993.090310705
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