Investigation of microstructural changes in polyetherether-ketone films at cryogenic temperatures by positron lifetime spectroscopy
National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1991 - 13 pages
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150 Temperature Abe Eftekhari Abstract Microstructural changes Aeronautics and Space amorphous films amorphous samples assembly for lifetime ature Changes in Polyetherether-Ketone Clair Cryogenic Temperatures Danny decreasing temperature continues Detector 2 Figure dry ice errors are 1°C Films at Cryogenic fraction versus temperature free-volume cells glass transition temperature Langley Research Center Large microvoids larger microvoids lifetime measurements liquid hydrogen liquid nitrogen LN2 or dry microvoids decreases Na22 positron NASA PEEK at Various PEEK Films percent 050 Performing Organization polyetherether-ketone PEEK Polymer Positron Lifetime Spectroscopy Positronium psec psec/percent psec/percent psec/percent Research Center Hampton results are summarized room temperature room-temperature average value sample temperature Samples of PEEK Semicrystalline 50 100 semicrystalline samples Singh Small microvoids Space Administration summarized in table temper temperature in PEEK temperature is lowered temperature of liquid Terry test coupons third lifetime components total free volume total free-volume fraction trend in reduction Various Temperatures Virginia volume with decreasing