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Polymorphism in poly(aryl ether ketone)s

โœ Scribed by KennCorwin H. Gardner; Benjamin S. Hsiao; Katherine L. Faron


Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
514 KB
Volume
35
Category
Article
ISSN
0032-3861

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## Abstract The evolution of crystallinity and polymorphism during hotโ€drawing of amorphous poly(ether ether ketone ketone) (PEEKK) as a function of strain rate, draw ratio, and temperature was investigated. In modification I, the competition of chain extension and molecular alignment is responsibl

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A new crystal modification induced by strain and denoted as form II exists alongside the dominant form I structure in the uniaxially oriented poly(ether ether ketone) (PEEK) and the related polymers. The crystal structure of form II for PEEK is also found to possess a two-chain orthorhombic packing

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## Abstract 1,3โ€Bis(4โ€phenoxybenzoyl)benzene (1) shows a single melting peak at __T__~1~ = 120ยฐC when __rapidly crystallized__ from a methanol/benzene mixture (10:1 v/v) (sample A) and a double melting peak at __T__~1~ = 120ยฐC and __T__~2~ = 130ยฐC when __crystallized slowly (overnight)__ (sample B)