High-Performance Polyolefin Material: Synthesis, Properties, and Application of Poly(4-Methyl-1-pentene).

As a kind of high-performance thermoplastic crystalline resin, poly(4-methyl-1-pentene) (PMP) is characterized by its low density, low dielectric constant, exceptional mechanical and chemical properties, high transparency, and gas permeability. PMP has recently received more attention since COVID-19, because it is used as a hollow-fiber membrane for extracorporeal membrane oxygenation (ECMO) based on its high permeability and excellent biocompatibility. This review summarizes the chemical structure, synthesis, properties, and application of PMP.

Bis-(salicylaldehyde-benzhydrylimino)nickel complexes with different electron groups: crystal structure and their catalytic properties toward (co)polymerization of norbornene and 1-hexene.

Eight bis-(salicylaldehyde-benzhydrylimino)nickel complexes with different electron groups (Ni1-Ni8), Ni{(3-R)(5-R)CH(O)CHNCH(CH)}, (R = H, R = H, Ni1; R = H, R = CH, Ni2; R = H, R = OCH, Ni3; R = H, R = Br, Ni4; R = CH, R = H, Ni5; R = OCH, R = H, Ni6; R = Br, R = Br, Ni7; R = Cl, R = Cl, Ni8), were synthesized and their crystal structures were characterized using single crystal X-ray diffraction. The results revealed that Ni1-Ni6 belong to the monoclinic system (space group 2(1)/), Ni7 belongs to the monoclinic system (space group 2/) and Ni8 belongs to the triclinic system (space group 1̄). All nickel complexes exhibited high activities (0.