The effect of properties of polyolefines and outdoor factors on the course of polyolefines' degradation

Wojtala, A.

doi:10.14314/polimery.2001.120

Cited by 4 publications

(8 citation statements)

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“…The initial reaction during this process is always cracking of a bond in the polymer chain or other molecule that initiates degradation. A number of secondary reactions can occur as a result of bond breakage, which initiate further bond breakage, recombination or substitution [ 38 ].…”

Section: Degradation Of Polymersmentioning

confidence: 99%

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%

Lifetime Prediction Methods for Degradable Polymeric Materials—A Short Review

2020

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“…Characteristics of the aging processes, both in natural and laboratory conditions, mainly the impact of the aging time, UV radiation intensity and temperature, were explicitly described for polyolefin in the works of Czaja et al [11,12], and in the work of Wojtala [18].…”

Section: Wybrane Wskaźniki Użytkowe Oceny Podatności Polipropylenu Na Barwienie Pigmentami O Różnej Odporności Na Uvmentioning

confidence: 99%

Selected performance indices for assessment of polypropylene susceptibility to dyeing by pigments of different UV resistance

Bieliński

Kościuszko

Smolińska

2021

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This study presents an assessment of the effects of usage time for polypropylene (PP) experimental samples including those dyed with pigments of different UV resistance. A standard double cavity mold was used to create the samples by injection molding. Selected indices were analyzed in terms of color change (UV resistance of pigments), and UV radiation resistance of a PP polymer medium. The experiment revealed a significant impact of the accepted usage time and the type of dye concentrates on the indices characterizing the sample color change (CIELab) and a change in the structure and state of the PP medium surface.

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“…Do badañ nad biodegradacj¹ folii polimerowych u¿yto grzybów mikroskopowych Penicillium funiculosum wyizolowanych z wysypiska oemieci w Sosnowcu i oznaczanych w Instytucie Ekologii Terenów Uprzemys³owionych w Katowicach i namna¿anych na skosach za-wieraj¹cych pod³o¿e Czapek-Doxa o sk³adzie: NaNO 3 -2 g, KH 2 PO 4 -0,7 g, K 2 HPO 4 -0,3 g, KCl -0,5 g, MgSO 4 •7H 2 O -0,5 g, FeSO 4 •7H 2 O -0,01 g, sacharoza -30 g, "Bacto Agar" (Difco) -20 g, woda destylowana -1000 cm 3 ; odczyn pod³o¿a doprowadzano do pH 6,0-6,5.…”

Section: Mikroorganizmyunclassified

“…Degradacja polimerów syntetycznych w oerodowisku naturalnym jest inicjowana przez nastêpuj¹ce czynniki abiotyczne: promieniowanie, temperatura, wilgotnooeae, zanieczyszczenia chemiczne, wiatr [1][2][3][4]. Czynniki te, dzia³aj¹c synergistycznie lub antagonistycznie, mog¹ wywo³ywaae w polimerze zmiany strukturalne dwojakiego rodzaju, mianowicie degradacjê powoduj¹c¹ zmniejszenie ciê¿aru cz¹steczkowego oraz sieciowanie prowadz¹ce do jego wzrostu [5][6][7][8].…”

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Biodegradation of aged composition of polyethylene with synthetic polyester

Labuzek¹,

Nowak²,

Pająk³

2006

Polimery

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Streszczenie-Zbadano wp³yw wstêpnego starzenia w warunkach abiotycznych (foto-, termo-i fototermodegradacja) na przebieg powodowanej przez grzyby mikroskopowe Penicillium funiculosum biodegradacji folii wykonanej z mieszaniny 80 % PE-LD i 20 % poliestru "Bionolle ® ". W celach porównawczych badano te¿ folie wykonane z czystych sk³adników tej mieszaniny. Stopieñ ka¿dego z badanych rodzajów degradacji oceniano na podstawie pomiarów ubytku masy folii, ich w³aoeciwooeci mechanicznych oraz morfologii powierzchni. Analiza widm IR pos³u¿y³a do zinterpretowania spowodowanej degradacj¹ zmiany budowy chemicznej badanej mieszaniny polietylenu i poliestru. Ustalono, ¿e degradacja abiotyczna polimerów intensyfikuje ich biodegradacjê nastêpcz¹ oraz ¿e dodatek poliestru "Bionolle ® " uwra¿liwia PE-LD na degradacyjne procesy rozk³adu. S³owa kluczowe: polietylen, poliester, mieszanina, degradacja abiotyczna, biodegradacja, w³aoeciwooeci mechaniczne, budowa chemiczna, ubytek masy. BIODEGRADATION OF AGED COMPOSITION OF POLYETHYLENE WITH SYNTHETIC POLYESTER Summary-The effect of preliminary aging, in abiotic conditions (photo-, thermal or photo-thermal degradation), of the film made of 80 % of PE-LD and 20 % of polyester "Bionolle ® " on the course of biodegradation caused by Penicillium funiculosum (filamentous fungi) was investigated. The films made of single components of this mixture (Table 1) were also investigated to compare the results obtained. The degrees of each kind of degradation have been estimated on the basis of changes of film weight loss (Table 2 and 3), the mechanical properties (Table 4) and morphology of the surface (characterized using scanning electron microscopy, Fig. 1 and 2). Changes in chemical structure of polyethylene/polyester blend caused by degradation were interpreted on the basis of IR spectra analysis (Fig. 3-5). It was found that abiotic degradation of the polymers accelerated their subsequent biodegradation and that addition of "Bionolle ® " polyester made PE-LD more sensitive to degradation processes.

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The effect of properties of polyolefines and outdoor factors on the course of polyolefines' degradation

Cited by 4 publications

References 0 publications

Lifetime Prediction Methods for Degradable Polymeric Materials—A Short Review

Lifetime Prediction Methods for Degradable Polymeric Materials—A Short Review

Selected performance indices for assessment of polypropylene susceptibility to dyeing by pigments of different UV resistance

Biodegradation of aged composition of polyethylene with synthetic polyester

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