| 摘要 |
PURPOSE:To make a filler usable without applying classification treatment, by using a fine particle composed of a crosslinked polymer obtained by modifying a fine particle composed of a low crosslinked polymer obtained by a seed polymerization system with a crosslinkable monomer and non-crosslinkable monomer. CONSTITUTION:A filler for gel permeation chromatography is composed of a fine particle of a crosslinked polymer obtained by absorbing a crosslinkable monomer and a non-crosslinkable monomer by a fine particle of a low crosslinked polymer and copolymerizing both monomers. As the crosslinked monomer, a monomer having two or more ethylenic double bonds like trimethylolpropane methacrylate is pref and, as the non-crosslinkable monomer, a styrenic monomer forming a polymer having a high glass transition point is used. The crosslinking degree of the fine particle composed of the low crosslinked polymer is pref. set so that the swelling degree due to the monomer to be used is 4-150, pref., 8-100 and the particle size of said fine particle is pref. 0.5-15mum and the standard deviation of the particle size distribution thereof is more pref. 0.05mum or less. By this method, the filler can be used without applying classification treatment. |
