caa a22 4500 465787754 CHVBK 20180323112014.0 cr unu---uuuuu 170327e19900101xx s 000 0 eng 10.1007/BF00983967 doi (NATIONALLICENCE)springer-10.1007/BF00983967 Direct monitoring of cationic polymerization by temperature, conductivity and permittivity measurements [Elektronische Daten] [Lajos Balogh, László Fábián, István Majoros, Tibor Kelen] Summary: Direct monitoring of cationic polymerization was accomplished by simultaneous measurement of the average dielectric constant, representing the dipoles, of the conductivity, produced by unpaired ions, and of the temperature, characteristic for reaction rate. The ionogenic equilibria during the living polymerization of isobutylene by 1, 3, 5-tris(2-methoxy-2-propyl)benzen/BCl3 in CH2Cl2 at-25°C were demonstrated. Temperature, resistance and capacitance were measured directly in the reaction mixture by a specially designed instrument. Both the conductivity and the average dielectric constant change characteristically during the living polymerization, indicating the presence and simultaneous change of unpaired ions and strongly polarized species. The differences between the AMI, and the aging technique were demonstrated and explained. In the latter case slow initiation was observed due to the methoxy-chlorine exchange caused by a reaction with BCl3. The applied direct monitoring method helps to understand the role of polarized and ionic species in polymerizations and related processes. Springer-Verlag, 1990 Balogh Lajos Department of Applied Chemistry, Kossuth Lajos University, H-4010, Debrecen, Hungary aut Fábián László Department of Applied Chemistry, Kossuth Lajos University, H-4010, Debrecen, Hungary aut Majoros István Department of Applied Chemistry, Kossuth Lajos University, H-4010, Debrecen, Hungary aut Kelen Tibor Department of Applied Chemistry, Kossuth Lajos University, H-4010, Debrecen, Hungary aut Polymer Bulletin Springer-Verlag 23/1(1990-01-01), 75-82 0170-0839 23:1<75 1990 23 289 https://doi.org/10.1007/BF00983967 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00983967 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Balogh Lajos Department of Applied Chemistry, Kossuth Lajos University, H-4010, Debrecen, Hungary aut NATIONALLICENCE 700 1- Fábián László Department of Applied Chemistry, Kossuth Lajos University, H-4010, Debrecen, Hungary aut NATIONALLICENCE 700 1- Majoros István Department of Applied Chemistry, Kossuth Lajos University, H-4010, Debrecen, Hungary aut NATIONALLICENCE 700 1- Kelen Tibor Department of Applied Chemistry, Kossuth Lajos University, H-4010, Debrecen, Hungary aut NATIONALLICENCE 773 0- Polymer Bulletin Springer-Verlag 23/1(1990-01-01), 75-82 0170-0839 23:1<75 1990 23 289 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer