Investigation of Microstructural Changes in Polyetherether-ketone Films at Cryogenic Temperatures by Positron Lifetime SpectroscopyNational Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1991 - Airplanes - 9 pages |
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250 Temperature 50 100 Temperature Abe Eftekhari Abstract Microstructural changes Aeronautics and Space Al chamber amorphous films amorphous samples Amorphous Semicrystalline ature Changes in Polyetherether-Ketone Clair Cryogenic Temperatures Danny dry ice fraction versus temperature free-volume cells free-volume fraction associated glass transition temperature Langley Research Center larger microvoids lifetime measurements liquid hydrogen liquid nitrogen NASA nm³ PEEK at Various PEEK Films percent 50 Performing Organization polyetherether-ketone PEEK Polymer Positron Lifetime Spectroscopy Positronium psec psec/percent psec/percent range of 23°C Research Center Hampton results are summarized room temperature room-temperature average value sample temperature Samples of PEEK Semicrystalline 0 50 Semicrystalline Films semicrystalline PEEK samples semicrystalline samples Singh Small microvoids Source/film Space Administration Styrofoam cylinder summarized in table temper Temperature errors temperature in PEEK temperature is lowered temperature of liquid Terry Terry L test coupons third lifetime components total free volume total free-volume fraction trend in reduction Various Temperatures Virginia volume with decreasing