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Xiaocui Han,Jianrui Zhang,Cheng Yue,Jinhui Pang,Haibo Zhang,Zhenhua Jiang 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.91 No.-
The gas separation of polymers of intrinsic microporosity (PIMs) was enhanced by incorporatingbipyrimidine (bpy) into the polymer (PIM-bpy-x) through the polycondensation of a novel tetraphenyl-bipyrimidine monomer. The structures of PIM-bpy-x were investigated with 1H NMR and FT-IR. Becauseof the excellent heat resistance imparted by the tetraphenyl-bipyrimidine unit, PIM-bpy-x displayedbetter thermal stability than did PIM-1. These polymers displayed large Brunauer-Emmett-Teller (BET)surface areas, ranging from 656 to 728 m2 g 1. The BET surface area of PIM-bpy-5 was 728 m2 g 1, whichwas similar to that of PIM-1 (774 m2 g 1). PIM-bpy-x exhibited excellent gas separation performance. PIM-bpy-5 showed the highest CO2 permeability (5141 barrer), which was much higher than that of PIM-1 (4234 barrer). The increase in CO2 permeability is due to the affinity between the N-rich bipyrimidineunits and CO2. Furthermore, PIM-bpy-x also showed greater resistance to aging than did PIM-1. All of theabove indicate that introducing bipyrimidine units into the polymers can enhance the gas separationperformance of PIMs.
Zhenhua Jiang,Xiujie Li,Shuling Zhang,Fugui Zhou,Jinhui Pang,Chunfeng Zhang,Dong Sun,Jianxin Mu,Guibin Wang 한국고분자학회 2011 Macromolecular Research Vol.19 No.5
Hyperbranched poly(ether ether ketone)s (HPEEKs) that were suitable as rheology control agents for linear poly(ether ether ketone)s (LPEEKs) were first prepared via commercially available hydroquinone (A2 monomer,HQ) and synthesized 3,4',5-trifluoro-benzophenone (BB'2 monomer, TF) effortlessly. The polymerization mode of A2 + BB'2 was demonstrated by MS. Moreover, FTIR, 1H NMR, 13C NMR, and 19F NMR spectroscopy revealed the structure and degree of branching (DB) of the resulting polymers. In comparison with A2 + B3 approach, HPEEK prepared using an A2 + BB'2 strategy possessed a higher molecular weight, and improved the melt processability of LPEEK. Remarkably, with the addition of HPEEK, the mechanical properties of LPEEK increased with a HPEEK content of 5%. The improved mechanical properties were attributed to the good miscibility. Moreover, the addition of HPEEK did not decrease the thermal stability of LPEEK.