No abstract

No abstract

Thermische Zers. und Carbonylierung der wie aufgezeichnet synthetisierten Titeldimeren (II) werden untersucht.

SynopsisThis paper describes the preparation of a series of novel perfluoroalkylene-and etherlinked aromatic polyimides. Depending on the nature of the precursor diamine, the polyimidea were prepared by either melt or solution techniques, the latter via the wrresponding poly( amic acids). The polymers were characterized by a variety of methods, and their structure is discussed.

synpmsThe synthesis and general physical characteristics of the peduoroalkylene-linked aromatic polyimides have been discussed in Part I. In this paper the hydrolytic, oxidative, and thermal stabilities of these polymers are compared with those of certain wholly aromatic polyimides. Comparative studies are also made on the effect of the fluoroalkylene chain on the glaas transition temperatures. The polymer from di-(4 aminophenyl) ether and 1,3-bi3(3,4dicarboxyphenyl)hexafluoropropane &anhydride has been studied in most detail and various mechanical and electrical properties of this polymer in film and solid molded form are discussed. 1809