caa a22 4500 465788491 CHVBK 20180323112016.0 cr unu---uuuuu 170327e19900201xx s 000 0 eng 10.1007/BF00338495 doi (NATIONALLICENCE)springer-10.1007/BF00338495 Stereoregular oligomers of methyl methacrylate [Elektronische Daten] 4.Supercritical fluid chromatography of the isotactic and syndiotactic oligomers of MMA [Koichi Hatada, Koichi Ute, Tohru Nishimura, Masaharu Kashiyama, Toshinori Saito, Makoto Takeuchi] Summary: Packed column SFC has been found suitable for the rapid and detailed analysis of the isotactic and syndiotactic oligomers of MMA, when the temperature gradient technique was applied and the modifier was employed. Oligomer components from trimer to 20-mer separated completely. The heptamer fraction collected three times by SFC gave the 1H NMR spectrum of satisfactorily high S/N ratio; the spectrum agreed well with that of the standard sample. Separation by tacticity as well as by molecular weight was observed for the SFC of a mixture of the isotactic and syndiotactic oligomers. The isotactic oligomers had longer retention time than the syndiotactic oligomers of the corresponding degree of polymerization. Springer-Verlag, 1990 Hatada Koichi Department of Chemistry, Faculty of Engineering Science, Osaka University, 560, Toyonaka, Osaka, Japan aut Ute Koichi Department of Chemistry, Faculty of Engineering Science, Osaka University, 560, Toyonaka, Osaka, Japan aut Nishimura Tohru Department of Chemistry, Faculty of Engineering Science, Osaka University, 560, Toyonaka, Osaka, Japan aut Kashiyama Masaharu Department of Chemistry, Faculty of Engineering Science, Osaka University, 560, Toyonaka, Osaka, Japan aut Saito Toshinori JEOL Ltd., 196, Akishima, Tokyo, Japan aut Takeuchi Makoto JEOL Ltd., 196, Akishima, Tokyo, Japan aut Polymer Bulletin Springer-Verlag 23/2(1990-02-01), 157-162 0170-0839 23:2<157 1990 23 289 https://doi.org/10.1007/BF00338495 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00338495 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hatada Koichi Department of Chemistry, Faculty of Engineering Science, Osaka University, 560, Toyonaka, Osaka, Japan aut NATIONALLICENCE 700 1- Ute Koichi Department of Chemistry, Faculty of Engineering Science, Osaka University, 560, Toyonaka, Osaka, Japan aut NATIONALLICENCE 700 1- Nishimura Tohru Department of Chemistry, Faculty of Engineering Science, Osaka University, 560, Toyonaka, Osaka, Japan aut NATIONALLICENCE 700 1- Kashiyama Masaharu Department of Chemistry, Faculty of Engineering Science, Osaka University, 560, Toyonaka, Osaka, Japan aut NATIONALLICENCE 700 1- Saito Toshinori JEOL Ltd., 196, Akishima, Tokyo, Japan aut NATIONALLICENCE 700 1- Takeuchi Makoto JEOL Ltd., 196, Akishima, Tokyo, Japan aut NATIONALLICENCE 773 0- Polymer Bulletin Springer-Verlag 23/2(1990-02-01), 157-162 0170-0839 23:2<157 1990 23 289 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer