Kinetic studies in the chemistry of rubber and related materials. I. The thermal oxidation of ethyl linoleate

doi:10.1098/rspa.1946.0040

Cited by 151 publications

(21 citation statements)

References 13 publications

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“…Emulsions of fatty acids and esters were studied by Marcuse andFredriksson (1968, 1969) (Bateman, 1954;Bolland, 1946 Marcuse also found that the rate decreasing effect of lowered P0 2 is influenced by the type of supporting material. The oxidation kinetics of the oil dispersed on starch and casein were more a function of oxygen pressure than the oil on cellulose.…”

Section: (5)mentioning

confidence: 99%

“…Henderson and Young (1942) Oxygen partial pressure functionality on ethyl esters of unsaturated fatty acids is treated by the above-mentioned workers in several papers (Batemen, 1954;Bolland, 1946;Bolland and Gee, 1946;Bolland, 1949). With the reaction vessels shaken to avoid oxygen diffusion limitations, the following conclusions were arrived at:…”

Section: Pure Compoundsmentioning

confidence: 99%

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Kinetics of Oxidation of Dehydrated Food at Low Oxygen Pressures

Kacyn

Saguy

Karel

1983

J Food Processing Preservation

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An apparatus for the measurement of adsorbed/entrapped oxygen held by dehydrated powdered products was developed and is described in detail.The method works on the principle of sample solubilization in deaerated water with compression of the liberated gases into a calibrated chamber containing an oxygen probe.When tested on nonfat dry milk, the coefficient of variation for the method is 20%.Kinetic studies using this apparatus were performed on a model system consisting of methyl linoleate dispersed on Avicel microcrystalline cellulose and nonfat dry milk at headspace oxygen concentrations of 0.52% -10.69%.Excellent correlation was found in the model system between diene conjugation values and oxygen uptake as measured by the apparatus.Correlation coefficients between the two methods were in the range .987 -. 997.Bimolecular kinetics were found to apply to both the model system and the milk-lipid system with KB's within the range expected from studies done by previous workers at higher 02 pressures.The KB's for the cellulose model system were found to be 5 to 6 times greater than those in the milk based system. This was due partly to encapsulation of lipids in the milk during preparation and partly due to smaller surface area in the milk-based system. Mathematical models for the oxidation rate constants as a function of headspace 02 concentrations were derived for the two systems.

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Section: (5)mentioning

confidence: 99%

Section: Pure Compoundsmentioning

confidence: 99%

Kinetics of Oxidation of Dehydrated Food at Low Oxygen Pressures

Kacyn

Saguy

Karel

1983

J Food Processing Preservation

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“…[48,49] After the rate determining step of bond dissociation, radicals are formed that can react with themselves (leading to crosslinking or via disproportionation to the formation of C=C double bonds). However, in the presence of oxygen, the radicals readily react to form hydroperoxy compounds.…”

Section: Colour Measurementsmentioning

confidence: 99%

Contaminant release from aged microplastic

et al. 2017

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Environmental context. Increasing global plastic production adds plastic debris to the environment. We show that potentially harmful additives present in plastic particles are released to water at an increased rate when material properties change by aging due to exposure to high temperature and especially to UV radiation. For risk assessment of such plastic additives, more information on their degradation products and their toxicity is needed.Abstract. Recycled plastic granules of high-density polyethylene, polyvinyl chloride and polystyrene the size of microplastics were exposed to artificial aging conditions (2000 h; photooxidative and thermo-oxidative) to simulate their fate outdoors. Their potential to leach into water during the aging process was investigated using column percolation tests. Aging-related changes on the surface of the material were characterised by IR measurements indicating oxidation reactions with the formation of new adsorption bands (C=O, C-O and OH), especially in the case of photooxidative aging. These findings were confirmed by the identification of leachable organic compounds. Leaching of total organic carbon, Cl, Ca, Cu and Zn is clearly affected by changes due to aging, and their release is increased after photooxidative aging. In general, exposure to photooxidative conditions shows a greater influence on aging and thus on leaching and seems to be the more important mechanism for the aging of microplastic in the environment. Comparison with the total content of inorganic species revealed that, for most elements, less than 3% of the total content is released after 2000 h of photooxidative aging.

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“…The chemical interactions responsible for the polymer (P) degradation have been considered [1,2,20,[39][40][41]:…”

Section: Ftir Analysismentioning

confidence: 99%

Surface degradation of styrene acrylonitrile exposed to corona discharge

Handala

Lamrous

2007

Int Trans Elec Energy Syst

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SUMMARYAn experimental investigation of the degradation of styrene acrylonitrile (SAN) exposed to corona discharge under ambient conditions was presented. SAN specimens were subjected to a corona stress generated by two plane parallel electrodes. The surface physicochemical changes were studied using scanning electron microscope, energy-dispersive X-ray analysis, Fourier transformed infrared spectroscopy and surface resistance measurements.The results showed significant damage on the specimen' surface caused by the corona discharge. Surface erosion was seen in the micrographs and colour change was observed on the aged surface.The surface resistance dropped rapidly during the first hours of exposure to the corona discharge, then approached a saturation value asymptotically. It was established that hydrophilic hydroxyl (O-H) and carbonyl (C --O) groups have formed on the surface of the aged sample. Moisture adsorbed by the hydrophilic OH groups plays an important role in the decrease of the surface resistance, as, under dry conditions after removal from the corona discharge, the surface resistance increased and tended to recover its original value.

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Kinetic studies in the chemistry of rubber and related materials. I. The thermal oxidation of ethyl linoleate

Cited by 151 publications

References 13 publications

Kinetics of Oxidation of Dehydrated Food at Low Oxygen Pressures

Kinetics of Oxidation of Dehydrated Food at Low Oxygen Pressures

Contaminant release from aged microplastic

Surface degradation of styrene acrylonitrile exposed to corona discharge

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