Extraction of polypropylene additives and their analysis by HPLC

Mansouri, H. El; Yagoubi, Najet; Ferrier, D.

doi:10.1007/bf02466639

Cited by 51 publications

(22 citation statements)

References 23 publications

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“…The most common components found were particulates and VOC's, meanwhile oxygenated compounds appeared in lower concentrations, with emission rates directly proportional to the extrusion temperature. El Mansouri 11 found that Irganox 1010 degrade into di-tert-butyl-p-hydroxytoluene (BHT) in the ratio of one molecule of Irganox for four molecules of BHT.…”

Section: Introductionmentioning

confidence: 99%

Thermo-mechanical degradation and VOC emission of unstabilized and stabilized polypropylene copolymer during multiple Extrusions

2011

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The thermo-mechanical degradation during the multi-extrusion of unstabilized and stabilized polypropylene copolymer (cPP) was analyzed using the Chain Scission Distribution Function (CSDF) method. During the first extrusion of unstabilized cPP almost 60% of the initial polymeric chains were submitted to chain scission. The calculations using CSDF show a random chain scission process of chains with molecular weight below 100 kg.mol -1 , and above that a preferential chain scission process. When stabilized the cPP molecular weight is kept constant, even after four extrusions, independently of the stabilizers concentration used. Its chain scission is greatly reduced, only being noteworthy at high values of molecular weight, presenting in this case a preferential chain scission process. During extrusion the unstabilized cPP evolves Volatile Organic Compounds (VOC) due to the volatilization of low molecular weight oxidized chain segments. VOC's emissions are greatly reduced during the melt processing of stabilized cPP, even after multiple extrusions.

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Section: Introductionmentioning

confidence: 99%

Thermo-mechanical degradation and VOC emission of unstabilized and stabilized polypropylene copolymer during multiple Extrusions

2011

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“…Thus we have determined their specific migration in isooctane, in order to compare it with the profiles of additive migrations obtained in another work. 18 The curve representative of de- sorbed oligomers area, from the C8 column, versus square root of time is shown in Figure 4. They achieved equilibrium of the migration at 60 min, whereas the Irganox 1010 (M w ϭ 1178) presented an equilibrium of migration at 72 h. This result proves that the low polarity governs the contaminants' migration in the isooctane more than the molecular weight.…”

Section: Resultsmentioning

confidence: 99%

Propylene oligomers: extraction methods and characterization by FTIR, HPLC, and SEC

Mansouri

Yagoubi

Scholler³

et al. 1999

J. Appl. Polym. Sci.

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Propylene oligomers were isolated from polymer matrix by dissolution precipitation and Soxhlet methods and characterized by Fourier transform infrared spectrometry, ultraviolet, high-performance liquid chromatography, and gel permeation chromatography. Both extracts showed that these hydrocarbon chemicals have a maximal absorption at 210 nm and are eluted from a C8 column with a strong mobile phase (tetrahydrofuran). However, their average molecular weights are different depending upon the quality of extraction: the fraction obtained by the dissolution-precipitation method is homogeneous in molecular weight, whereas the one obtained by Soxhlet extraction has a higher polydispersity index (M n /M w ). The specific migration test of propylene oligomers in a food simulant (isooctane) shows total diffusion within 60 min.

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“…Our research team and other groups studied the degradation of polymer additives under ionizing radiation during the sterilization of plastic materials [145][146][147] and their degradation during storage [96,99,148]. Degradation products are formed and are able to diffuse from the polymer matrix into the surrounding environment [149][150][151].…”

Section: Degradation Of the Additivesmentioning

confidence: 99%

Physico-chemical ageing of ethylene–norbornene copolymers: a review

et al. 2017

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The main object of this report is to review and summarize the current state of the scientific literature relating to physico-chemical ageing of ethylene-norbornene copolymers (ENCs). These processes occur through different means such as photodegradation under the effect of ultraviolet radiation, temperature and ionizing radiation (under air or oxygen). In most cases ageing causes chains scissions that lead to the creation of degradation compounds that exhibit high mobility, corresponding to their low molecular weight and/or high polarity. Cross-linking can also occur, leading to the modification of mechanical properties. The presence of oxygen during ageing is of great importance for the physico-chemical modifications of those polymers in terms of oxidation and thermal stability. ENCs belong to cyclic olefin copolymers (COC) class, whose synthesis was developed in the late 1950s. Nevertheless, commercial applications are relatively new. They attract growing interest in different fields, due to their very useful physical and chemical properties such as transparency, heat and chemical resistance, low permeability to gas as well as biocompatibility. In the literature, a large number of papers deal with the synthesis and characterization of different grades of ENC, but only a few deal with the effects of ageing on these materials. This literature review consists of a summary of the main milestones in the development of COC as well as of cyclic olefin polymers (COP), a review of main techniques for predicting ageing, degradation of additives and interaction between COC/COP and contact environment as well as toxicity of the extractables.

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Extraction of polypropylene additives and their analysis by HPLC

Cited by 51 publications

References 23 publications

Thermo-mechanical degradation and VOC emission of unstabilized and stabilized polypropylene copolymer during multiple Extrusions

Thermo-mechanical degradation and VOC emission of unstabilized and stabilized polypropylene copolymer during multiple Extrusions

Propylene oligomers: extraction methods and characterization by FTIR, HPLC, and SEC

Physico-chemical ageing of ethylene–norbornene copolymers: a review

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