Abstract
A series of wholly aromatic polyketones bearing benzimidazolone moieties (PK-BI) were synthesized via N–C coupling polycondensation. Calcium carbonate coupled with potassium carbonate was used for the first time to achieve a high molecular weight, with Tg of the polymer as high as 299 °C. The polymer structure was confirmed by solid state 13C NMR and FT-IR. The thermal stability of wholly aromatic polyketones with a benzimidazolone unit in the main chain was significantly improved, being higher than those of PEEKs and other amorphous PAEKs, proved by thermogravimetric analysis (TGA) and derivative thermogravimetric (DTG) analysis. The degradation activation energy (Ek) values estimated by Flynn–Wall–Ozawa (FWO) and Kissinger methods were 260.33 kJ mol−1 and 282.57 kJ mol−1, respectively, which are higher than those of PEEKs.
Highlights
Aromatic polymers containing only aromatic rings and ketonic carbonyl groups as dominating linkages in the main chain are de ned as wholly aromatic polyketones.[1]
The structural characteristics of the wholly aromatic polyketone endowed the polymer with longer conjugating units than poly(aryl ether ketone)s (PAEKs), which are an important class of high performance resins
In the main chain of PAEK, the ether bond was a weaker linkage compared to the carbonyl group.[2]
Summary
Aromatic polymers containing only aromatic rings and ketonic carbonyl groups as dominating linkages in the main chain are de ned as wholly aromatic polyketones.[1]. In the main chain of PAEK, the ether bond was a weaker linkage compared to the carbonyl group.[2] for wholly aromatic polyketones, the absence of ether bonds in the main chain led to a more rigid structure, and the thermal stability was enhanced. While some aliphatic polyketones[3] had been synthesized, wholly aromatic polyketones,[4,5,6,7,8,9,10,11,12] a new series of highperformance polymers, were reported by Yonezawa's group (see Scheme 1). For the rst time, we reported the synthesis and the thermal degradation of a new member of heat-resistant wholly aromatic polyketone with benzimidazolone unit, PK-BI. We presumed that the big size & rigid benzimidazolone unit and nitrogen, as heteroatom, will both efficiently enhance the thermal durability compared to PEEK
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