Mechanism of polyethylene oxidation

Abstract

synopsisAcetic and formic acids and acetone are products of the oxidation of propylene and ethylene polymers and copolymers. The two-and three-carbon products can be accounted for as the result of intramolecular attack by radicals, leading to &oxidation. A high proportion of scissions in polypropylene involves multiple intmmolecular attack.This papcr reports some observations pcrtincnt to the mechanism of oxidation of polyethylene and polypropylene. A number of previous investigations have dealt with other aspects of the oxidation process, including effects of temperature, crystallinit~y, and other external conditions. '-I8

Chemical alteration of LDPE hollow fibers exposed to monoethanolamine solutions used as absorbent for CO2 capture process

“…It was shown to be mainly due to the wellknown auto-oxidation phenomenon in air [12][13][14]. Bevilacqua et al [12] proposed a mechanism for polyethylene oxidation by nucleophilic attack of peroxy anions on hydroperoxides. In this mechanism, acetic acid, formic acid and acetone were reported to be the main polyethylene oxidation products.…”

“…Chemical degradation of polyolefin materials was investigated by different groups [12][13][14][15][16]. It was shown to be mainly due to the wellknown auto-oxidation phenomenon in air [12][13][14]. Bevilacqua et al [12] proposed a mechanism for polyethylene oxidation by nucleophilic attack of peroxy anions on hydroperoxides.…”

“…Porcheron and Drozds [11] attributed the partial wetting of membrane pores to a possible plasticizing effect of CO 2 in membranes inside the contactors. Chemical degradation of polyolefin materials was investigated by different groups [12][13][14][15][16]. It was shown to be mainly due to the wellknown auto-oxidation phenomenon in air [12][13][14].…”

Catalytic oxidation of polyethylene with oxygen under solid‐state conditions

“…The polyethylene is oxidized25–36 according to the widely known free‐radical chain mechanism 37, 38. Polyethylene is a semicrystalline polymer containing crystalline and amorphous phases.…”

Study of the thermal oxidation of polyole‐fins. V. Volatile products in the thermal oxidation of polyethylene

“…4 The individual components could be analyzed by gas chromatography3A6 and liquid chromatography. 6 The results of the various authors are, however, somewhat contradictory, regarding the relative amounts of these various products present. These discrepancies may be due to different reaction conditions and polymer samples; e.g., acid yield depends on sample crystallinity.6…”