The first carbocationic isomerization polymerization of 3-methyl-1-butene and 4-methyl-1-pentene in supercritical carbon dioxide (SC.CO2) has been demonstrated. The use of the “H2O”/AlCl3initiating system at 32.5°C readily gives -40% conversions of poly (3-methyl-1 -butene) of Mn = 1000 (Mw/Mn = 1.41), and -70% conversions of poly(4-methyl-1-pentene) of Mn = 1700 (Mw/Mn = 2.16). According to IR spectroscopy the degrees of isomerization in SC.CO2at 32.5°C are similar to those occurring in conventional liquid systems at much lower temperatures. The nature and mechanism of side reactions are discussed.
|Number of pages||10|
|Journal||Journal of Macromolecular Science - Pure and Applied Chemistry|
|Publication status||Published - 1995|
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry
- Polymers and Plastics