Melting point of polymers under high pressure
- 1. Technische Universitaet Darmstadt, Ernst Berl-Institut fuer Technische und Makromolekulare Chemie, Petersenstr. 20, D-64287 Darmstadt (Germany)
- 2. Friedrich-Alexander-Universitaet, Erlangen-Nuernberg (Germany)
Description
The influence of highly compressed gases on the melting of polyethylene was investigated for nitrogen, helium and ethylene. The impact of the particle size of the polymer and the heating rate on the melting point were also analysed. The melting points were determined with a high pressure differential thermal analysis (HPDTA) apparatus. These measurements were compared with independent measurements, done by high pressure differential scanning calorimetry (HPDSC), without gas. From this experimental data it was possible to calculate the concentration of the gas in the molten polymer phase based on equilibrium thermodynamics. For high density polyethylene (HDPE), a concentration of nitrogen at the polymer melting point of 10.4-35.7 mL(SATP) g(polymer)-1, in the pressure interval of 65-315 MPa, was calculated
Availability note (English)
Available from http://dx.doi.org/10.1016/j.tca.2008.12.023Additional details
Identifiers
- DOI
- 10.1016/j.tca.2008.12.023;
- PII
- S0040-6031(08)00448-6;
Publishing Information
- Journal Title
- Thermochimica Acta
- Journal Volume
- 486
- Journal Issue
- 1-2
- Journal Page Range
- p. 46-51
- ISSN
- 0040-6031
- CODEN
- THACAS
INIS
- Country of Publication
- Netherlands
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 40083336
- Subject category
- S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
- Descriptors DEI
- CALORIMETRY; COMPRESSED GASES; DIFFERENTIAL THERMAL ANALYSIS; ETHYLENE; HEATING RATE; HELIUM; MELTING; MELTING POINTS; NITROGEN; POLYETHYLENES; PRESSURE RANGE MEGA PA 10-100; PRESSURE RANGE MEGA PA 100-1000; THERMODYNAMICS
- Descriptors DEC
- ALKENES; ELEMENTS; FLUIDS; GASES; HYDROCARBONS; NONMETALS; ORGANIC COMPOUNDS; ORGANIC POLYMERS; PHASE TRANSFORMATIONS; PHYSICAL PROPERTIES; POLYMERS; POLYOLEFINS; PRESSURE RANGE; PRESSURE RANGE MEGA PA; RARE GASES; THERMAL ANALYSIS; THERMODYNAMIC PROPERTIES; TRANSITION TEMPERATURE
Optional Information
- Copyright
- Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.