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• W1970341703 abstract "Polymerizations of di-substituted p-dibromobenzenes [with the following substituents: linear alkoxy groups (1a–d), branched alkoxy groups (1e and 1f), and methoxyethoxy (1g)] and tetrasubstituted p-dibromobenzenes [with the following substituents: butoxy (1h) as well as butoxy and methyl (1i)] were investigated with a Ni catalyst. Monomers having linear alkoxy groups polymerized to give relatively high molecular weight polymers (Mn=40 300–49 600) in good yields. However, the molecular weights and yields of the polymers having branched alkoxy groups were relatively low because of the steric effect of branched alkoxy chains. The methoxyethoxy group-containing monomer afforded an oligomer with an Mn of 666. The coupling reaction of tetrasubstituted p-dibromobenzenes occurred at a very-low level because of the steric hindrance of the tetra substituents. Polymers 2a–f exhibited high thermal stability, and the decomposition temperatures were higher than 350 °C. From the differential scanning calorimetry thermograms, 2b–d and 2f showed melting of crystallites (Tm: 120 °C for 2b, 95 °C for 2c, 100 °C for 2d and 16 °C for 2f), and 2a and 2e showed glass transitions (Tg: 155 °C for 2a, 65 °C for 2e). The freestanding membranes could be prepared by the hot-press method from the crystalline polymers (2b–d). These membranes exhibited relatively high gas permeability, and the oxygen permeability coefficients were 14.8–27.8 barrer, higher than those previously reported for poly(p-phenylene)s having ester substituents. Disubstituted p-dibromobenzenes having alkoxy groups polymerized to give relatively high molecular weight polymers (Mn=14 700–49 600) in good yields. Polymers exhibited high thermal stability, and the decomposition temperatures were higher than 350 °C. From the differential scanning calorimetry thermograms, polymers showed melting of crystallites or glass transitions. The free-standing membranes could be prepared by the hot-press method. The membrane possessing hexyl side chains exhibited relatively high gas permeability, and the oxygen permeability coefficient was 25.6 barrer, higher than those previously reported for poly(p-phenylene)s having ester substituents." @default.
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• W1970341703 date "2015-03-11" @default.
• W1970341703 modified "2023-09-27" @default.
• W1970341703 title "Polycondensation of di- and tetrasubstituted dibromobenzenes for synthesis of poly(p-phenylene)s having alkoxy groups and gas permeability of membranes" @default.
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• W1970341703 doi "https://doi.org/10.1038/pj.2015.11" @default.
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