The Effect of Accelerated Aging on Polylactide Containing Plant Extracts

Moraczewski, Krzysztof; Stepczyńska, Magdalena; Malinowski, Rafał; Karasiewicz, Tomasz; Jagodziński, Bartłomiej; Rytlewski, Piotr

doi:10.3390/polym11040575

Cited by 34 publications

(24 citation statements)

References 53 publications

(53 reference statements)

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“…The degradation process most often causes irreversible changes in the polymer, which are the result of such reactions as: crosslinking, chain cutting, thermal oxidation and even destruction [ 32 ]. The scheme of changes caused by the degradation process is shown in Figure 1 .…”

Section: Degradation Of Polymersmentioning

confidence: 99%

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Lifetime Prediction Methods for Degradable Polymeric Materials—A Short Review

2020

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The determination of the secure working life of polymeric materials is essential for their successful application in the packaging, medicine, engineering and consumer goods industries. An understanding of the chemical and physical changes in the structure of different polymers when exposed to long-term external factors (e.g., heat, ozone, oxygen, UV radiation, light radiation, chemical substances, water vapour) has provided a model for examining their ultimate lifetime by not only stabilization of the polymer, but also accelerating the degradation reactions. This paper presents an overview of the latest accounts on the impact of the most common environmental factors on the degradation processes of polymeric materials, and some examples of shelf life of rubber products are given. Additionally, the methods of lifetime prediction of degradable polymers using accelerated ageing tests and methods for extrapolation of data from induced thermal degradation are described: the Arrhenius model, time–temperature superposition (TTSP), the Williams–Landel–Ferry (WLF) model and 5 isoconversional approaches: Friedman’s, Ozawa–Flynn–Wall (OFW), the OFW method corrected by N. Sbirrazzuoli et al., the Kissinger–Akahira–Sunose (KAS) algorithm, and the advanced isoconversional method by S. Vyazovkin. Examples of applications in recent years are given.

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Section: Degradation Of Polymersmentioning

confidence: 99%

“…There are strong links between the types of degradation presented above and, as mentioned, there are often several types of degradation at the same time [ 34 ]. An example is the simultaneous action of oxygen, light and other atmospheric factors [ 32 ].…”

Section: Degradation Of Polymersmentioning

confidence: 99%

Lifetime Prediction Methods for Degradable Polymeric Materials—A Short Review

2020

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“…In such composites, additives play an important role and should also have positive impact on natural environmental and human health. The application of selected phytochemicals as additions to polymers with biodegradability and derived from renewable resources is an innovative way to obtain pro-ecological polymeric materials [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…Essences that contain mixtures of various antioxidants, including green or black tea extracts, turned out to be good stabilizers for polypropylene [28]. On the other hand, coffee, cocoa and cinnamon extracts effectively stabilize aliphatic polyesters [8]. Also, mixtures of polyphenols derived from Cistus linnaeus and Juglans regia Linnaeus walnut green husk incorporated into a bio-based and biodegradable polymeric matrix via an impregnation process work as environmentally friendly stabilizers [29].The examples presented concerning beneficial impact of natural antioxidants on polymers indicate that there is a real possibility to apply these substances as pro-ecological additives for polymeric materials.…”

mentioning

confidence: 99%

Thermal Analysis of Aliphatic Polyester Blends with Natural Antioxidants

2020

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The aim of this research was to enhance thermal stability of aliphatic polyester blends via incorporation of selected natural antioxidants of plant origin. Thermal methods of analysis, including differential scanning calorimetry (DSC) and thermogravimetry (TGA), are significant tools for estimating the stabilization effect of polyphenols in a polymer matrix. Thermal stability was determined by analyzing thermogravimetric curves. Polymers with selected antioxidants degraded more slowly with rising temperature in comparison to reference samples without additives. This property was also confirmed by results obtained from differential scanning calorimetry (DSC), where the difference between the oxidation temperatures of pure material and polymer with natural stabilizers was observed. According to the results, the materials with selected antioxidants, including trans-chalcone, flavone and lignin have higher oxidation temperature than the pure ones, which confirms that chosen phytochemicals protect polymers from oxidation. Moreover, based on the colour change results or FT-IR spectra analysis, some of the selected antioxidants, including lignin and trans-chalcone, can be utilized as colorants or aging indicators. Taking into account the data obtained, naturally occurring antioxidants, including polyphenols, can be applied as versatile pro-ecological additives for biodegradable and bio-based aliphatic polyesters to obtain fully environmentally friendly materials dedicated for packaging industry.

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“…The paper presents the results of research on a "green" polylactide based polymer material containing extracts of coffee, cocoa and cinnamon which have height concentration of polyphenols. Detailed test results of selected processing, thermal and mechanical properties of samples containing different contents of tested extracts and the impact of the aging process on these properties are presented in [21].…”

Section: Introductionmentioning

confidence: 99%

Impact of Accelerated Aging on the Performance Characteristics of "Green" Packaging Material of Polylactide

Moraczewski¹,

Pawłowska²,

Karasiewicz³

et al. 2020

Adv. Sci. Technol. Res. J.

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The paper presents the result of the research on the impact of the accelerated aging process on selected operational properties of polylactide films containing natural antioxidants in the form of coffee, cocoa or cinnamon extracts. The research was focused on mechanical properties important for the packaging industry from the point of view of the reliability of the obtained products, i.e. tensile strength, relative deformation at maximum stress, relative deformation at break, Young's modulus, impact strength and storage module at various temperatures. The extracts have a positive effect on the determined mechanical properties. The obtained results were very often better not only than the values obtained for pure polymer, but also better than the values obtained for the film containing the synthetic anti-aging compound. It can therefore be concluded that the proposed plant extracts will have a positive effect on the stability of the mechanical properties of the manufactured products, which will allow long-term, reliable and safe operation of packaging. Proposed extracts can therefore be an alternative to the previously used synthetic anti-aging additives.

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The Effect of Accelerated Aging on Polylactide Containing Plant Extracts

Cited by 34 publications

References 53 publications

Lifetime Prediction Methods for Degradable Polymeric Materials—A Short Review

Lifetime Prediction Methods for Degradable Polymeric Materials—A Short Review

Thermal Analysis of Aliphatic Polyester Blends with Natural Antioxidants

Impact of Accelerated Aging on the Performance Characteristics of "Green" Packaging Material of Polylactide

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