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윤관한 金烏工科大學校 1993 論文集 Vol.14 No.-
In order to know what is the extent of dead zone of the reactor designed for high efficiency polymerization of poly ethylene terephthalate, it was assumed that the reactor consists of dead zone, PFR(plug flow reactor) portion and CSTR(continuous stirred tank reactor) portion. The RTD(residence time distribution) of the reactor was investigated by comparing experimental data with two parameters model of the reactor. PFR portion decreases with increasing mixture volume as well as the flow rate(residence time). Dead zone portion decreases with flow rate, but increases with the screw speed(rpm).
윤관한,이영실 한국고분자학회 2023 폴리머 Vol.47 No.2
The relations between rheological properties and dispersion state of polymer adsorbed magnetic particles in the dispersion are investigated to characterize the amount of adsorbed polymer. Also, the transverse susceptibility measurement as magnetic property has been performed to characterize the magnetic dispersion. Dispersions of Co-γ-Fe2O3nanoparticles were prepared using a binder polymer with polar groups, which adsorbed on the surface of the magnetic nanoparticles, in the molecular chains. The adsorbed layer thickness increases with decreasing particle volume fraction because of large amount of solvent penetration in the adsorbed layer resulting in the increase of the radius of gyration of the adsorbed polymer. For the magnetic nanoparticle dispersion with the volume fraction below the interaction limit, there is shear thickening in steady shear viscosity, which is resulted from the polymer bridges. According to the transverse susceptibility measurement, there are more individual particles in the magnetic nanoparticle dispersion at low volume fraction of nanoparticle.