PEKEKK

AcronymDefinition
PEKEKKPolyetherketone Etherketone Ketone
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A series of novel copolymers of PEKEKK and PEAAEKK were prepared by the electrophilic Friedel--Crafts solution copolycondensation of TPC with a mixture of DPOBPN and BPMPDA, over a wide range of DPOBPN/BPMPDA molar ratios, as shown in Scheme 2.
2, the polymer I with 100 mol% DPOBPN (PEKEKK) had five major diffraction peaks at 2[theta] that are 15.6[degrees] (020), 18.7[degrees] (110), 20.6[degrees] (111), 23.4[degrees] (200), and 28.6[degrees] (211).
The [T.sub.g] values of the polymers 1--IX increased with the increase in concentration of BPMPDA in the polymer, and the polymer I (PEKEKK) with 100 mol% DPOBPN had the lowest [T.sub.g] of 169[degrees]C, whereas the polymer IX with 100 mol% BPMPDA had the highest [T.sub.g] of 231[degrees]C.
The polymer I (PEKEKK) without BPMPDA had the highest [T.sub.d] of 556[degrees]C, whereas the polymer IX with 100 mol% BPMPDA had the lowest [T.sub.d] of 480[degrees]C.
Linkous [37] reported that PEK, PEKEKK, and PEKK were stable in a water-saturated hydrogen environment to 400[degrees]C and in water-saturated oxygen to 300[degrees]C.