Autoxidation of polypropylene

Chien, James C. W.; Boss, C.; Jabloner, H.; Vandenberg, E. J.

doi:10.1002/pol.1972.130101205

Cited by 10 publications

(5 citation statements)

References 13 publications

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“…It has been observed that the intramolecular propagation plays an important role in the oxidations of 2,4-dimethylpentane (32933)y 2,4,6-trimethylheptane (34), and polypropylene (35,36). However, this intra molecular propagation must be unimportant in PVA oxidation since 2,4-pentanediol did not give 2,4-pentanedione under similar conditions (Run 18).…”

Section: Discussionmentioning

confidence: 88%

Oxidative Degradation of Polymers. III.

Niki

Yamamoto

Kamiya

1978

Advances in Chemistry

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The rates and products of poly(vinyl alcohol) (PVA) photo oxidation were measured over a temperature range of 30°-90°C. Oxidation was initiated with 253.7-nm light, and several model compounds were included. The PVA photooxidation rate was autocatalytic and relatively insen sitive to temperature with the major products being carbon dioxide, acids, peroxides, polymeric β-hydroxyketone, and hydrogen peroxide. Acids were mostly formic acid and carboxylic acids at the polymer chain ends. Several molecule of carbon dioxide and acid were formed per statistical chain scission. The mechanism of the photooxidation of PVA is discussed.T)VA is one of the most widely used polymers with the characteristic property that it is soluble in water but insoluble in most organic solvents. PVA oxidation by molecular oxygen in aqueous solution is interesting fundamentally and practically. From a fundamental point of view, it gives information on the chemistry and reactions of oxy radicals in aqueous solution. Practically, it is important in suppressing oxidative deterioration and such ecological problems as wastewater treatment and chemical recovery.PVA oxidation has been studied by several groups, and it has been observed that the degree of polymerization decreases when PVA is oxi dized with hydrochloric acid (J), potassium permanganate (2-4) potas sium bichromate (3,5,6), hydrogen peroxide (7,8), periodic acid, and ozone (9). However, only a limited number of studies have been per formed on the oxidation of PVA by molecular oxygen. Shiraishi and Matsumoto (10) observed that it is oxidized by molecular oxygen in alkaline aqueous solution, which causes discoloration and a decrease in 0-8412-0381-4/78/33-169-078$05.00/l

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Section: Discussionmentioning

confidence: 88%

Oxidative Degradation of Polymers. III.

Niki

Yamamoto

Kamiya

1978

Advances in Chemistry

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“…The mechanism of PP thermal oxidation is considered as proceeding by a radical chain mechanism. 30,32 On the basis of reported mechanistic studies of thermal oxidation of PP [41][42][43][44] and similar polymers, 45,46 likely mechanisms accounting for the formation of the four major VOCs detected have been proposed. Their extended discussion can be found as Supporting Information to this paper.…”

Section: Resultsmentioning

confidence: 99%

Real Time Analysis of Volatile Organic Compounds from Polypropylene Thermal Oxidation Using Chemical Ionization Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

et al. 2009

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The volatile organic compounds emitted during polypropylene thermal oxidation at constant temperature were analyzed in real time using proton transfer reaction associated with Fourier transform ion cyclotron resonance mass spectrometry. Four major compounds were identified: acetone, formaldehyde, acetaldehyde, and methylacrolein. The time dependence of the emissions showed a complex profile consisting successively in an induction period, a stationary state with low emission rate, and final rapid degradation of the sample. The formaldehyde mixing ratio increases by a factor of 3 between the stationary state stage and the fast degradation stage, while the other products remain in constant proportions. The kinetic and mechanistic implications of these results are discussed.

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“…The suspension grafting was made in water Table 2 The determination of half-lifetimes at different temperature. acrylic acid mixture to which small quantities of sulphate and iron were added in order to prevent further formation of PPA homopolymers [14,15]. The process of grafting acrylic acid in mass is the same as that of MMA grafting and styrene.…”

Section: Synthesis Of Copolymer Poly(vdf-g-aa)mentioning

confidence: 99%