Effect of polymethylhydrosiloxane on propylene polymerization catalyzed by Ziegler catalyst

✍ Scribed by Shiihara, Isao ;Kawai, Wasaburo ;Ichihashi, Taichi

• Book ID: 104532123
• Publisher: John Wiley and Sons
• Year: 1962
• Weight: 706 KB
• Volume: 57
• Category: Article
• ISSN: 0022-3832
• DOI: 10.1002/pol.1962.1205716566

✦ Synopsis

Abstract

Polymethylhydrosiloxane was added to the Ziegler catalyst in propylene polymerization, and a kinetic study carried out for this system was in good agreement with the results obtained in the polymerization carried out in an autoclave under pressure. The experimental equations for polymerization rate are

for constant siloxane and AlEt~3~ concentrations and

for constant siloxane and TiCl~4~ concentrations, where α, A, and β are constants. From experimental results of studies of the chemical properties of polymethylhydrosiloxane, a reasonable reaction mechanism was proposed which can explain the experimental results in the polymerization process. The polymers were separated by use of several solvents, and both the residue and extracted parts showed the presence of silicon. On the basis of chemical analysis and infrared absorption spectra, it was concluded that the polymers obtained were copolymers of polypropylene and polymethylsiloxane.