Characterization of radiation-crosslinked, high-density polyethylene
Crystalline, form-stable, high-density polyethylene (HDPE) pellets were previously developed for thermal energy storage. The present study is directed toward characterization of the crosslinked, form-stable HDPE pellets produced by electron beam radiation crosslinking, and the effects of crosslinking on crystallinity and heat of fusion. Calorimetric measurements of the heats of fusion (..delta..H/sub f/) of the radiation-crosslinked HDPE (in dosages of 4 to 18 Mrad) showed that while a substantial decrease in ..delta..H/sub f/ occurred after the first melting cycle (up to approx. 25%), slow cooling (1.25/sup 0/C/min) on recrystallization of the pellets could restore the ..delta..H/sub f/ value to 95% of that of the uncrosslinked HDPE up to 9.0 Mrad dosage exposure. The form stability of the 9.0-Mrad HDPE was very good even after 500 melt-freeze cycles in ethylenes glycol. However, some further decline in ..delta..H/sub f/ was noted along with an increase in gel content at the end of the 500 cycles. X-ray diffraction measurements showed little or no difference in crystallinity among the various radiation-crosslinked HDPE's and the uncrosslinked control HDPE, indicating the crosslinking occurs primarily in the amorphous regions of the polyethylene.
- Research Organization:
- Mound Facility, Miamisburg, OH (USA)
- DOE Contract Number:
- AC04-76DP00053
- OSTI ID:
- 6020979
- Report Number(s):
- MLM-2874-OP; CONF-811076-3; ON: DE82002559; TRN: 82-000769
- Resource Relation:
- Conference: 9. DOE compatibility meeting, St Petersburg, FL, USA, 27 Oct 1981
- Country of Publication:
- United States
- Language:
- English
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Characterization of radiation-cross-linked, high-density polyethylene for thermal energy storage
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Related Subjects
25 ENERGY STORAGE
36 MATERIALS SCIENCE
POLYETHYLENES
CHEMICAL RADIATION EFFECTS
FUSION HEAT
CALORIMETRY
CROSS-LINKING
ELECTRON BEAMS
GELS
GLYCOLS
INFRARED SPECTRA
LATENT HEAT STORAGE
MELTING
PELLETS
RECRYSTALLIZATION
THERMAL ENERGY STORAGE EQUIPMENT
X-RAY DIFFRACTION
ALCOHOLS
BEAMS
CHEMICAL REACTIONS
CHEMISTRY
COHERENT SCATTERING
COLLOIDS
DIFFRACTION
DISPERSIONS
ENERGY STORAGE
ENTHALPY
EQUIPMENT
HEAT STORAGE
HYDROXY COMPOUNDS
LEPTON BEAMS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PARTICLE BEAMS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
POLYMERIZATION
POLYMERS
POLYOLEFINS
RADIATION CHEMISTRY
RADIATION EFFECTS
SCATTERING
SPECTRA
STORAGE
THERMODYNAMIC PROPERTIES
TRANSITION HEAT
400600* - Radiation Chemistry
250600 - Energy Storage- Thermal
360404 - Materials- Polymers & Plastics- Physical Properties- (-1987)