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タイトルNuclear Instruments and Methods in Physics Research
本文(外部サイト)http://hdl.handle.net/2060/19980200986
著者(英)Singh, Jag J.; Eftekhari, Abe; Pater, Ruth H.
著者所属(英)NASA Langley Research Center
発行日1998-01-01
1998
言語eng
内容記述Thermoset and thermoplastic polyimides have complementary physical/mechanical properties. Whereas thermoset polyimides are brittle and generally easier to process, thermoplastic polyimides are tough but harder to process. It is expected that a combination of these two types of polyimides may help produce polymers more suitable for aerospace applications. Semi-Interpenetrating Polymer Networks (S-IPNs) of thermoset LaRC(Trademark)-RP46 and thermoplastic LARC(Trademark)-IA polyimides were prepared in weight percent ratios ranging from 100:0 to 0: 100. Positron lifetime measurements were made in these samples to correlate their free volume features with physical/mechanical properties. As expected, positronium atoms are not formed in these samples. The second life time component has been used to infer the positron trap dimensions. The "free volume" goes through a minimum at about 50:50 ratio, suggesting that S-IPN samples are not merely solid solutions of the two polymers. These data and related structural properties of the S-IPN samples have been discussed in this paper.
NASA分類Nonmetallic Materials
レポートNONAS 1.26:208212
NASA/TM-97-208212
権利No Copyright
URIhttps://repository.exst.jaxa.jp/dspace/handle/a-is/98836


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