Is carbonyl index a quantitative probe to monitor polypropylene photodegradation?

Rouillon, Camille; Bussière, Pierre‐Olivier; Desnoux, Eric; Collin, Steeve; Vial, Christophe; Thérias, Sandrine; Gardette, Jean‐Luc

doi:10.1016/j.polymdegradstab.2015.12.011

Cited by 201 publications

(125 citation statements)

References 44 publications

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“…Evidently, possible specific interactions between iPP and the plasticizer molecules could have an additional effect. spectroscopy [26][27][28][29][30]. The appearance of bands in the region between 1700 and 1800 cm -1 , ascribed to the formation of carboxyl species, such as acids, esters, ketones or lactones, starts to be observed as degradation is initiated [26][27][28][29][30].…”

Section: Resultsmentioning

confidence: 99%

Effect of thermo-oxidation on loss of plasticizers, on crystalline features and on properties in a metallocene isotactic polypropylene

Blázquez‐Blázquez

Barranco‐García

Cerrada

et al. 2019

Polymer

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Incorporation of a low content of several plasticizers into a metallocene isotactic polypropylene (iPP) has been performed in order to learn about their stability and performance by the action of a thermo-oxidative degradation treatment at 95 °C for different times. Comparison with the behavior exhibited by the material with di(2-ethylhexyl) phthalate (DEHP) is established for a feasible replacement of its use for contributing to environmental and human health preservation. Dependence of these aggressive degrading conditions on plasticizer loss is analyzed as well as elucidation of degradation influence on the iPP crystalline characteristics. The results show that chemical changes associated with this degradation process hinder formation of the orthorhombic γ crystalline lattice and postpone the overall crystallization capability. Accordingly, the final features in the film surface and the mechanical response are significantly affected by degradation time. The TOTM plasticizer can be considered an excellent candidate for DEHP substitution.

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Section: Resultsmentioning

confidence: 99%

Effect of thermo-oxidation on loss of plasticizers, on crystalline features and on properties in a metallocene isotactic polypropylene

Blázquez‐Blázquez

Barranco‐García

Cerrada

et al. 2019

Polymer

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“…Thus, at 3385 cm -1 there is a broad band due to the hydroxyl groups associated by hydrogen bonds. The photodegradation mechanism proposed and sustained by other authors [5,6] involves the formation in the first stage of hydroperoxides that decompose with the formation of aldehydes or ketones, acids, lactones or esters, as shown in figure 2. Support for the formation of different species with carbonyl groups and for the reaction mechanism is the broad carbonyl band with several peaks and shoulders and variation of the intensity and position of the carbonyl band during the photodegradation.…”

Section: Results and Discussion Polypropylene Photodegradationmentioning

confidence: 87%

“…Analyzing the DR-UV-VIS-NIR spectra of the blank PP films exposed under the same conditions, the following considerations can be made: a) In the visible range, as the exposure time increases, it was observed that there was an increase in sample reflectance of more than 5 % at 410 nm, due to surface phenomena reported by other authors [5], in terms of cracking and exfoliation, increased roughness and loss of gloss due to superficial degradation; b) in the NIR domain the increase in the number of methyl groups onto the surface is confirmed as a result of the degradation by the increase of the characteristic band at 1705 nm compared to the 1725 nm (characteristic of the methylene groups) as shown in figure 4.…”

Section: Results and Discussion Polypropylene Photodegradationmentioning

confidence: 99%

Photocatalytic Degradation of Some Polyolefin-TiO2 Composites Evaluated by Molecular Spectroscopy

Rădiţoiu¹,

Rădiţoiu²,

Raduly³

et al. 2019

Mat.Plast.

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The photochemical degradation of polyolefin-TiO2 composite films was investigated and described in relationship with the concentration of photocatalyst and after different exposure times. UV-Vis-NIR and IR spectra reveal the presence of various degradation products, which are in direct connection with the photodecomposition mechanism. Various ratios between the absorbance of some typical IR characteristic bands can lead to the evaluation of photocomposition of polyethylene and polypropylene composite films containing TiO2 nanoparticles.The results show that the photocatalytic degradation of composites is significantly faster than the simple photolytic decomposition of pure polypropylene and polyethylene and could be used as a solution for the destruction of this type of wastes.

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“…Since several decades, several works investigated the influence of ageing on their mechanical and visual aspect properties. Biocomposites strongly lost strength and stiffness [3][4][5][6][7] and the presence of natural fibers were evidenced to give rise to materials surface defects, gloss being compromised by these surface aspect changes [3,8,9]. The natural reinforcing part also instigated the biocomposites discoloration by photo-induced oxidation [3,9,10].…”

Section: Introductionmentioning

confidence: 99%

“…Relationships between properties of thermoplastics determined all along their weathering have been investigated. A correlation between modification of crystalline fraction and detection of micro-cracks after polypropylene (PP) accelerated ageing was deduced from microscopy and calorimetry analyses [8]. But this observation cannot be verified by regression and remains crude correlation.…”

Section: Introductionmentioning

confidence: 99%

Natural weathering of hemp fibers reinforced polypropylene biocomposites: Relationships between visual and surface aspects, mechanical properties and microstructure based on statistical approach

Badji¹,

Beigbeder²,

Garay³

et al. 2018

Composites Science and Technology

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Two natural weathering of neat polypropylene (PP) and hemp fibers reinforced PP biocomposites were investigated. The objective was to emphasize the relationships between the properties of materials according to the fiber loading and the weathering time in order to bring new insights of degradation mechanisms understanding. For this purpose, a Principal Component Analysis (PCA) method was applied to the dataset. The treatment carried out by isolating materials loaded by the three different hemp fiber rates particularly outstand the link between mechanical properties and products issued from oxidation. The close correlation between whitening parameter and C]C bond level also confirmed the lignin degradation way. Finally, depending on the weathering duration, the properties characterized either fiber loading or weathering state (unweathered or weathered) whereas mechanical performance differentiated the three different non-weathered samples whatever the exposure time.

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Is carbonyl index a quantitative probe to monitor polypropylene photodegradation?

Cited by 201 publications

References 44 publications

Effect of thermo-oxidation on loss of plasticizers, on crystalline features and on properties in a metallocene isotactic polypropylene

Effect of thermo-oxidation on loss of plasticizers, on crystalline features and on properties in a metallocene isotactic polypropylene

Photocatalytic Degradation of Some Polyolefin-TiO2 Composites Evaluated by Molecular Spectroscopy

Natural weathering of hemp fibers reinforced polypropylene biocomposites: Relationships between visual and surface aspects, mechanical properties and microstructure based on statistical approach

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