Carboxylic acid assisted oxidation of polypropylene studied by chemiluminescence

Broska, Rastislav; Rychlý, Jozef; Csomorová, Katarína

doi:10.1016/s0141-3910(98)00097-4

Cited by 34 publications

(26 citation statements)

References 17 publications

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“…It is well documented that oxidation can be favored by metallic impurities playing a catalytic (redox) role [7] or by species such as carboxylic acids capable of establishing strong hydrogen bonds with the polymeric ROOH groups [8]. These cases of assisted oxidation differ from the co-oxidation phenomena described in this current study.…”

Section: Introductionmentioning

confidence: 57%

“…Chemiluminescence experiments were performed using a Lumipol 3 apparatus designed in-house at the Polymer Institute in the Slovak Academy of Sciences [7]. Films impregnated by methyl oleate and linolenate were placed into aluminum pans and heated under nitrogen to 150 C. They were then maintained at this temperature under oxygen at 0.1 MPa pressure.…”

Section: Chemiluminescencementioning

confidence: 99%

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Co-oxidation kinetic model for the thermal oxidation of polyethylene-unsaturated substrate systems

Richaud¹,

Fayolle²,

Verdú³

et al. 2013

Polymer Degradation and Stability

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. a b s t r a c tThe thermal oxidation of polyethylene (PE) impregnated by the methyl esters of unsaturated fatty acids (UFEs) was studied using chemiluminescence, and infra-red spectrophotometry. It was shown that the presence of UFEs accelerates the PE aging process. This can be interpreted as a co-oxidation phenomenon. In this study, the previously established models for PE and UFEs self-oxidation have been coupled in order to develop a co-oxidation model. Using the existing rate constants for the PE and UFEs selfoxidations, this model can simulate the complex shape of the kinetic curves of PE-UFE co-oxidation.

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Section: Introductionmentioning

confidence: 57%

Section: Chemiluminescencementioning

confidence: 99%

Co-oxidation kinetic model for the thermal oxidation of polyethylene-unsaturated substrate systems

Richaud¹,

Fayolle²,

Verdú³

et al. 2013

Polymer Degradation and Stability

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“…As materials that accelerate the thermal oxidative degradation of iPP, benzoyl peroxide (BPO) [11], formaldehyde [11,22] and organic acids [11,23] have been reported. The acceleration effect of BPO is due to its radical-initiating ability [11], whereas the formaldehyde and organic acid additives are considered to catalyze the hydroperoxide decomposition as prodegradants [11,22,23].…”

Section: Resultsmentioning

confidence: 99%

“…The acceleration effect of BPO is due to its radical-initiating ability [11], whereas the formaldehyde and organic acid additives are considered to catalyze the hydroperoxide decomposition as prodegradants [11,22,23]. Considering the chemical structure, the acceleration effect of unsaturated chain end groups is likely due to not only the catalysis of the hydroperoxide decomposition, but also their action as degradation initiators.…”

Section: Resultsmentioning

confidence: 99%

Degradation behavior of polymer blend of isotactic polypropylenes with and without unsaturated chain end group

Nakatani

Kurniawan

Taniike

et al. 2008

Science and Technology of Advanced Materials

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In this work, the relationship between the unsaturated chain end group content and the thermal oxidative degradation rate was systematically studied with binary polymer blends of isotactic polypropylene (iPP) with and without the unsaturated chain end group. The iPPs with and without the unsaturated chain end group were synthesized by a metallocene catalyst in the absence of hydrogen and by a Ziegler catalyst in the presence of one, respectively. The thermal oxidative degradation rate of the binary iPP blends was estimated from the molecular weight and the apparent activation energy ( E), which were obtained through size exclusion chromatography (SEC) and thermogravimetric analysis (TGA) measurements, respectively. These values exhibited a negative correlation against the mole content of the unsaturated chain end group. The thermal oxidative degradation rate apparently depends on the content of the unsaturated chain end group. This tendency suggests that the unsaturated chain end acts as a radical initiator of the iPP degradation reaction.

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“…It is also reported that bimolecular interaction between carboxylic acid and hydroperoxide leads to formation of free radicals, according to equation (4) [41].…”

Section: Density Measurementsmentioning

confidence: 99%

Study on the effect of galbanic acid on photo-oxidative degradation of linear low density polyethylene (LLDPE) films

Jahanmardi

Assempour

2008

E-Polymers

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Photo-oxidative degradation of LLDPE films (~ 250 μm thick) containing varying amounts of galbanic acid (a type of coumarin derivatives) was investigated by exposing the films to an artificial sunlight (emitted by 300 W OSRAM UltraVitalux lamps) at 40 ○ C for extended time periods. Photo-oxidative degradation of the neat polymer film and the LLDPE films containing benzophenone (an active photo-initiator for PE) and coumarin alone were also studied under similar conditions for comparison. The rate of photo-oxidation was assessed by measuring tensile properties, gel content, carbonyl index, molecular weight and density. It was shown that galbanic acid was highly effective in accelerating photo-oxidation of LLDPE films and an outstanding acceleration of photo-oxidation was observed for the film containing 0.2 wt % of galbanic acid in comparison with the film containing the same amount of benzophenone. However, the film containing coumarin did not exhibit considerable difference in behaviour in photo-oxidation relative to the neat LLDPE film during the exposure time. On the basis of the obtained results, the prooxidant activity of galbanic acid was described in terms of activity of the functional groups existing in the substituted moiety of its molecules.

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Carboxylic acid assisted oxidation of polypropylene studied by chemiluminescence

Cited by 34 publications

References 17 publications

Co-oxidation kinetic model for the thermal oxidation of polyethylene-unsaturated substrate systems

Co-oxidation kinetic model for the thermal oxidation of polyethylene-unsaturated substrate systems

Degradation behavior of polymer blend of isotactic polypropylenes with and without unsaturated chain end group

Study on the effect of galbanic acid on photo-oxidative degradation of linear low density polyethylene (LLDPE) films

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