caa a22 4500 465788343 CHVBK 20180323112016.0 cr unu---uuuuu 170327e19900401xx s 000 0 eng 10.1007/BF00294864 doi (NATIONALLICENCE)springer-10.1007/BF00294864 Living cationic polymerization of styrene by the methanesulfonic acid/tin tetrachloride initiating system in the presence of tetra-n-butylammonium chloride [Elektronische Daten] [Yoshiyuki Ishihama, Mitsuo Sawamoto, Toshinobu Higashimura] Summary: Living cationic polymerization of styrene was achieved by the methanesulfonic acid/tin tetrachloride (CH3SO3H/SnCl4) initiating system in the presence of tetra-n-butylammonium chloride (nBu4NCl) in methylene chloride solvent below 0 °C. The typical reagent concentrations of this initiating system were as follows: CH3SO3H/SnCl4/nBu4NCl=20/100/40 mM; [Styrene]0=1.0 M. The number-average molecular weights of the product polymers increased in direct proportion to monomer conversion, and their molecular weight distributions (MWDs) were fairly narrow $$\left( {\bar M_W /\bar M_n \leqslant {\text{1}}{\text{.2}}} \right)$$ throughout the reaction. On addition of a fresh feed of styrene at the end of the polymerization, the added feed was smoothly polymerized at the same rate as in the first stage; the polymer molecular weight further increased in direct proportion to monomer conversion; and their molecular weight distributions stayed narrow $$\left( {\bar M_W /\bar M_n \leqslant {\text{1}}{\text{.2 - 1}}{\text{.3}}} \right)$$ . On the other hand, in the absence of nBu4NCl, the polymerization initiated by CH3SO3H/SnCl4 in CH2Cl2 at -15 °C led to non-living polymers with a broad molecular weight distribution. This indicates that nBu4NCl is essential to this living system. Springer-Verlag, 1990 Ishihama Yoshiyuki Department of Chemistry, Kyoto University, 606, Kyoto, Japan aut Sawamoto Mitsuo Department of Chemistry, Kyoto University, 606, Kyoto, Japan aut Higashimura Toshinobu Department of Chemistry, Kyoto University, 606, Kyoto, Japan aut Polymer Bulletin Springer-Verlag 23/4(1990-04-01), 361-366 0170-0839 23:4<361 1990 23 289 https://doi.org/10.1007/BF00294864 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00294864 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ishihama Yoshiyuki Department of Chemistry, Kyoto University, 606, Kyoto, Japan aut NATIONALLICENCE 700 1- Sawamoto Mitsuo Department of Chemistry, Kyoto University, 606, Kyoto, Japan aut NATIONALLICENCE 700 1- Higashimura Toshinobu Department of Chemistry, Kyoto University, 606, Kyoto, Japan aut NATIONALLICENCE 773 0- Polymer Bulletin Springer-Verlag 23/4(1990-04-01), 361-366 0170-0839 23:4<361 1990 23 289 Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 465787576 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer