Stereospecific polymerization of isobutyl vinyl ether at elevated temperatures

✍ Scribed by Iwasaki, K.

• Publisher: John Wiley and Sons
• Year: 1962
• Weight: 255 KB
• Volume: 56
• Category: Article
• ISSN: 0022-3832
• DOI: 10.1002/pol.1962.1205616304

✦ Synopsis

Abstract

Isotactic polyvinyl isobutyl ether was obtained using chromium trioxide as catalyst at elevated temperatures, even at 80°C. Polymerization was carried out in a heterogeneous system. A stirring device to mill the catalyst is necessary to obtain polymer which has a high crystalline fraction. The crystalline fraction, whose melting point is over 140°C., was separated by extracting the amorphous portion with methyl ethyl ketone, and was between 20 and 30% weight of the total polymer. In this connection, other transition metal oxides were examined but chromium oxides of lower valence than 6 had little activity toward polymerization. Moreover, molybdenum trioxide, vanadium pentoxide, and nickel monoxide showed activity toward polymerization, but the polymers obtained with these catalysts had no crystalline fraction.