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Title: Blocky Ionomers via Sulfonation of Poly(ether ether ketone) in the Semicrystalline Gel State
Award ID(s):
1809291
NSF-PAR ID:
10092151
Author(s) / Creator(s):
; ; ;
Date Published:
Journal Name:
Macromolecules
Volume:
51
Issue:
16
ISSN:
0024-9297
Page Range / eLocation ID:
6226 to 6237
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
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  1. The engineering thermoplastic poly(ether ether ketone) (PEEK) has a rigid backbone that crystallizes relatively slowly upon cooling the melt. In this study, fast scanning chip calorimetry (FSC) was used to analyze isothermal crystallization between 170 and 285 °C, a range from about 27 K above the glass transition temperature up to the melting temperature. Incorporation of carbon nanotubes (CNT) enhances nucleation at all crystallization temperatures, including low temperatures. FSC also was employed to study crystallization at cooling rates spanning 0.33 to 8000 K/s, important as PEEK is subject to these conditions during melt processing. The critical cooling rate to produce a vitrified sample was increased from 500 K/s in the neat PEEK to 4000 K/s in a 5% CNT/PEEK nanocomposite due to faster nucleation rate caused by heterogeneous nucleation. 
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