caa a22 4500 465788580 CHVBK 20180323112016.0 cr unu---uuuuu 170327e19900201xx s 000 0 eng 10.1007/BF00338506 doi (NATIONALLICENCE)springer-10.1007/BF00338506 Stereospecificity of substitution on PVC [Elektronische Daten] Kinetic results at low temperatures [G. Martínez, C. Mijangos, J. Millán] Summary: The kinetics of substitution reaction on PVC with sodium benzenethiolate at temperatures from-30°C to 5°C is studied and compared to that of earlier work at temperatures from 5°C to 70°C. The kinetic parameters indicate the occurrence of two overlapping processes having activation energy of 10 and 17 Kcal/mol. Their attribution to the isotactic GTTG− and the heterotactic GTTT triad conformations respectively, is argued on the basis of recent results. A few of substitution experiments were repeated in the presence of diglyme or crown ether. They clearly demonstrate that kinetic features are only dependant on the microstructure of the polymer. Springer-Verlag, 1990 Martínez G. Instituto de Ciencia y Tecnología de Polímeros, CSIC, Juan de la Cierva 3, E-28006, Madrid, Spain aut Mijangos C. Instituto de Ciencia y Tecnología de Polímeros, CSIC, Juan de la Cierva 3, E-28006, Madrid, Spain aut Millán J. Instituto de Ciencia y Tecnología de Polímeros, CSIC, Juan de la Cierva 3, E-28006, Madrid, Spain aut Polymer Bulletin Springer-Verlag 23/2(1990-02-01), 233-238 0170-0839 23:2<233 1990 23 289 https://doi.org/10.1007/BF00338506 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00338506 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Martínez G. Instituto de Ciencia y Tecnología de Polímeros, CSIC, Juan de la Cierva 3, E-28006, Madrid, Spain aut NATIONALLICENCE 700 1- Mijangos C. Instituto de Ciencia y Tecnología de Polímeros, CSIC, Juan de la Cierva 3, E-28006, Madrid, Spain aut NATIONALLICENCE 700 1- Millán J. Instituto de Ciencia y Tecnología de Polímeros, CSIC, Juan de la Cierva 3, E-28006, Madrid, Spain aut NATIONALLICENCE 773 0- Polymer Bulletin Springer-Verlag 23/2(1990-02-01), 233-238 0170-0839 23:2<233 1990 23 289 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer