High Pressure X-Ray Studies of Polymers. III. Variation of Pressure with Temperature in the Diamond-Anvil cell.
RUTGERS - THE STATE UNIV PISCATAWAY NJ HIGH PRESSURE MATERIALS RESEARCH LAB
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The pressure in the diamond cell X-ray camera was measured as a function of temperature. Contrary to the assumption of previous workers this pressure was not found to be constant with increased temperatures, the different thermal expressions of sample, pressure medium, diamonds and retaining ring combining to produce pressure increases of 100 over a 100 C temperature range. In view of the fact that the diamond cell is frequently used to study the crystallization of polymers at high pressure, it should be noted that changes in pressure are equivalent to changes in the degree of supercooling. Since the crystallization kinetics and resulting polymer morphology are affected critically by even small changes in the degree of supercooling, conclusions drawn from investigations where the pressure was not directly measured should be regarded with caution. Author
- Physical Chemistry
- Polymer Chemistry
- Test Facilities, Equipment and Methods