Melt stabilisation of Phillips type polyethylene, Part II: Correlation between additive consumption and polymer properties

Kriston, Ildikó; Orbán-Mester, Ágnes; Nagy, G.; Staniek, Peter; Földes, Enikő; Pukánszky, Béla

doi:10.1016/j.polymdegradstab.2009.05.002

Cited by 34 publications

(19 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Differences in melt flow rate values can be distinguished only at small antioxidant contents, below 2 mmol OH/kg PE, since the reactions of vinyl groups lead to the formation of long chain branches only after the consumption of the applied secondary antioxidant [118]. This statement is strongly corroborated by Fig.…”

Section: Application In Polymerssupporting

confidence: 57%

Natural antioxidants as stabilizers for polymers

Kirschweng

Tátraaljai

Földes

et al. 2017

Polymer Degradation and Stability

157

126

View full text Add to dashboard Cite

Section: Application In Polymerssupporting

confidence: 57%

Natural antioxidants as stabilizers for polymers

Kirschweng

Tátraaljai

Földes

et al. 2017

Polymer Degradation and Stability

157

126

View full text Add to dashboard Cite

“…This is a smaller change than without any stabiliser where MFI drops to 0.06 g/10 min. The independence of MFI from β-carotene concentration indicates that the reactions of vinyl groups do not always lead to the chain extension of the polymer, though the latter is characteristic for the degradation of Phillips type polyethylenes [10]. This can be attributed to the radical trapping ability of β-carotene at low oxygen concentrations [31,41,42].…”

Section: Processing Stabilitymentioning

confidence: 99%

“…The phosphorous antioxidant inhibits degradation reactions by decomposing hydroperoxide groups to alcohols and it reacts also with carbon-centred, peroxy and oxy radicals [1,7,8]. Its efficiency is affected strongly by its chemical composition and thermal stability, as well as the amount of oxygen present [7][8][9][10]. Hindered phenols terminate autoxidation by trapping alkylperoxy, alkoxy and alkyl radicals [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…The efficiency of the phenolic antioxidant depends on the number of hydroxyl groups and the nature of substituents at the orto and para positions to the phenolic OH group [15,16]. The synergistic effect of phenol/phosphorous antioxidant combinations compared to single antioxidants can be partly attributed to the reduced rate of consumption of each type of stabiliser during the processing of polyethylene [10]. Different synthetic antioxidants are used for stabilisation in practice.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study of the effect of natural antioxidants in polyethylene: Performance of β-carotene

Tátraaljai

Major

Földes

et al. 2014

Polymer Degradation and Stability

Self Cite

View full text Add to dashboard Cite

The effect of β-carotene on the behaviour of polyethylene stabilized with α-tocopherol and a phosphonite antioxidant was studied under processing and storage conditions. The amount of β-carotene ranged between 0 and 2000 ppm. The polymer was characterised by different methods after processing then during and after storage at ambient temperature in light and dark. β-Carotene hinders the oxidation of polyethylene and does not increase the chain extension reactions during processing, though more vinyl groups and phosphonite molecules react. β-Carotene colours polyethylene strongly already at low concentrations. The reactions of the polymer and β-carotene are affected strongly by the storage conditions. The presence of β-carotene does not influence the stabilizing efficiency of the primary and secondary antioxidants. In dark the molecular structure of the polymer does not change appreciably, while the reactions of β-carotene lead to an increase in the yellowness index. In light the molecular characteristics of polyethylene undergo significant changes indicating long chain branching. The polymer fades rapidly after an induction period. The length of the induction period is not influenced by light. The rate of the degradation reactions of β-carotene during storage is controlled by its concentration and film thickness. Visible autoaccelerated decomposition in light renders β-carotene candidate as an indicator in active packaging materials.

show abstract

“…The division is determined by the types of environmental factors against which the material should be protected [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. One of the most important groups of stabilizers are, undoubtedly, antioxidants.…”

Section: Introductionmentioning

confidence: 99%

Flavonoids as Natural Stabilizers and Color Indicators of Ageing for Polymeric Materials

Masek

2015

Polymers

View full text Add to dashboard Cite

Few changes have occurred in the use of various stabilizers over recent years. In the current literature, phosphate derivatives are used as anti-ageing additives in polymers, and the most popular of these are sterically hindering cyclic amines. However, most of these compounds are carcinogenic. Synthetic phenols have been increasingly used as antioxidants in food and in polymers. Ecological standards encourage the elimination of harmful additives in polymeric products that come in contact with food or with the human body. This article presents application of flavonoid (silymarin/flavonoligand) for polymer stabilization and use of natural phytocompounds such as color indicators of polymers ageing time. In this research, I propose two ways of application: traditional, during processing; and the new one, by using impregnation method. Based on the change of deformation energy (ageing coefficient K), FTIR, oxidative induction time (OIT) evaluated by differential scanning calorimetry (OIT), thermogravimetry analysis (TG), spectrophotometric color measurements in terms of CIE-Lab color space values, I confirmed the high antioxidant activity of flavonoids in EPM. They provide coloration of the polymeric materials that changes cyclically as a function of aging time. Additionally, the use of phytocompounds in polymers provides similar stabilizing effect to those of synthetic antioxidants.

show abstract

Melt stabilisation of Phillips type polyethylene, Part II: Correlation between additive consumption and polymer properties

Cited by 34 publications

References 41 publications

Natural antioxidants as stabilizers for polymers

Natural antioxidants as stabilizers for polymers

Study of the effect of natural antioxidants in polyethylene: Performance of β-carotene

Flavonoids as Natural Stabilizers and Color Indicators of Ageing for Polymeric Materials

Contact Info

Product

Resources

About