Recent aspects of the uncatalyzed thermal oxidation of isotactic polypropylene

Abstract

The authors previously reported work on the kinetics and mechanism of the uncatalyzed thermal oxidation of isotactic polypropylene. The data, obtained form infrared absorption spectra of the carbonyl region, was utilized in developing the theoretical expressions presented. This paper summarizes this work and presents further evidence which substantiates the derived expressions. The additional evidence is obtained from infrared absorption spectra involving the apparent hydroperoxy region and from measurements on the rate of formation of volatile products. Some recent pertinent literature is also discussed.

Approaches to polymers containing a silicon-oxygen bond in the main chain

“…The addition reaction of trimethylsilyl halides with cyclic ethers is a very useful reaction in various organic syntheses [61]. When dichlorodisilanes [or bis(chlorosilane)s] and bis(epoxide)s were used in this reaction in the presence of tetrabutylammonium chloride or tetrabutylphosphonium chloride, high-molecular-weight poly(silyl ether)s (M n = 9000-38 000) were regioselectively afforded under mild conditions (room temperature to 50 • C within 24 h) (Scheme 9) [62,63].…”

Effect of concentration of atactic polypropylene on its rate of autoxidation

“…".12 As demonstrated previously, various kinetic expressions could be derived For for uncatalyzed and catalyzed autoxidations from the above scheme. the former reaction, steps (l), (2) to (4), (5), (6), and (7) through (9b) were used, whereas for the latter oxidat,ion, steps (l'), (2) Catalyzed Oxidation12122 I n this case, the following expression was obtained for a net maximum rate formation, Pm,nec (the difference between observed catalyzed rate, pm.lot, and the maximum uncatalyzed rate, P , ,~) at constant temperature:…”

Kinetics of autoxidation of isotactic polybutene‐1 by infrared spectroscopy

“…[2][3][4] In this paper, we present an extension of the previously reported mathematical treatment to the case of isotactic polybutene-1 (IPB). The experimental data were obtained from the quantitative estimation of carbonyl groups by infrared spectro~copy.…”