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Block copolymerization of 1-chloro-2-phenylacetylene (ClPA), 2-nonyne, and (p-n-butyl-o,o,m,m-tetrafluorophenyl)acetylene (p-BuF 4 PA) as novel comonomers through the sequential addition process was studied by use of MoOCl 4 -based living polymerization catalysts. The acetylenes that are known to undergo living polymerization and block copolymerization, i.e. 1-chloro-1-octyne (ClOc),...
Physical aging of polystyrene (PS) in the glassy state was investigated by dynamic viscoelasticity measurements. Two kinds of PS sample (T g =110°C), almost equal in weight-average molecular weight but different in molecular weight distribution, were used. Physical aging was observed for the samples aged at 60 and 80°C after having been quenched from 190°C. The physical aging was not affected...
Block copolymerization of substituted acetylenes through the sequential addition process was studied by use of three MoOCl4-based living polymerization catalysts in anisole solvent. In the case of the MoOCl4–n-Bu4Sn–EtOH catalyst system, diblock copolymers with very narrow molecular weight distributions were selectively formed from any combinations of two monomers among 1-chloro-1-octyne (ClOc), [o-(trimethylsilyl)phenyl]acetylene...
Local mobility of three substituted polyacetylenes was investigated by means of a quasielastic neutron scattering technique aiming at elucidating the origin of gas permeability of these polymers. It was found that the local flux, which is defined as the product of the relaxation rate Γ, and the mobile fraction fm, increases with the gas permeability coefficient. This suggests that the local flux is...
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