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 assembly Detector ature Changes in Polyetherether-Ketone Clair constant at room-temperature Cryogenic Temperatures Danny dry ice fraction versus temperature free-volume cells glass transition temperature Langley Research Center larger microvoids LH2 temperature lifetime measurements liquid hydrogen liquid nitrogen LN2 or dry NASA nm³ PEEK at Various PEEK Films percent 50 Performing Organization phases of PEEK 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 Second-component semicrystalline samples Singh Small microvoids Space Administration summarized in table temper Temperature errors temperature in PEEK temperature is lowered temperature of liquid Temperatures by Positron Terry Terry L test coupons third lifetime components total free volume total free-volume fraction trend in reduction Various Temperatures Virginia volume with decreasing