Abstract

Abstract One facet of materials science which has been the subject of intensive research over the last decade is the development of new ther mally stable polymers. The main stimulus has come from the need to meet the demands of modern technological advances and, in particular, the increasingly stringent environmental requirements of the space program. Much effort has been expended on the synthesis and evaluation of the thermal stability of new organic, organometallic, and inorganic polymers; highly fluorinated polymers; coordination polymers; and pyrolytic polymers. The goal has been to extend the useful upper temperature limits a t which polymers maintain their desirable properties to at least 300°C, with an ultimate objective of 500°C o r above. The protection of spacecraft and missiles against the intense heat encountered on “reentry” has focused attention on the ablative properties of plastics, and many studies have been devoted to the protective mechanism and performance of various materials, notably...

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