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Living cationic polymerization of p-alkoxystyrenes by free ionic species

✍ Scribed by Shokyoku Kanaoka; Toshinobu Higashimura

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
222 KB
Volume
37
Category
Article
ISSN
0887-624X

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✦ Synopsis

In contrast to the common view, living cationic polymerization of p-methoxy-and p-t-butoxystyrenes proceeded in polar solvents such as EtNO 2 /CH 2 Cl 2 mixtures, and involvement of free ionic growing species therein was examined. For example, the two alkoxystyrenes were polymerized with the isobutyl vinyl ether-HCl adduct/ZnCl 2 initiating system at Ϫ15°C in such polar solvents as CH 2 Cl 2 or EtNO 2 / CH 2 Cl 2 [1/1 (v/v)], as well as toluene. The number average molecular weight (M n ) of the polymers increased in direct proportion to the monomer conversion, even after sequential monomer addition, and the molecular weight distribution (MWD) stayed very narrow throughout the reaction. In addition, the M n agreed with the calculated values, assuming that one adduct molecule generates one living polymer chain. In these polar media the addition of a common ion salt retarded the polymerization, indicating that dissociated ionic species are involved in the propagating reaction.

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Demonstration of the Existence of Long-Lived Species in the Cationic Polymerization of 1,3-Pentadiene Initiated by Aluminium Trichloride in Non Polar Solvent
✍ Véronique Bennevault-Celton; Marilyn Delfour; Hervé Cheradame 📂 Article 📅 2004 🏛 John Wiley and Sons 🌐 English ⚖ 221 KB

## Abstract **Summary:** A kinetic study of the polymerization of a mixture of 1,3‐pentadiene isomers initiated by AlCl~3~ was carried out in pentane at −10 and 20 °C. A second apparent monomer order was found mainly at room temperature and was explained by a complexation of propagating active cent