Methods of forecasting of the changes of polymeric products properties

Jachowicz, Tomasz; Sikora, R.

doi:10.14314/polimery.2006.177

Cited by 10 publications

(11 citation statements)

References 2 publications

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“…The ageing of material under operating conditions may take a very long time before changes are visible, so degradation processes are accelerated [57][58][59]. It was assumed that, in natural conditions, the time needed to assess changes in material properties for soft plastics is about 3 years, while for hard plastics it is not less than 5 years.…”

Section: Accelerated Aging Of Polymeric Materialsmentioning

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: Accelerated Aging Of Polymeric Materialsmentioning

confidence: 99%

Lifetime Prediction Methods for Degradable Polymeric Materials—A Short Review

2020

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“…These methods are usually used for polymer materials or application areas such as biodegradable plastics [18,23,26]. Products that are expected to be used for a long time are analyzed by methods for prognosing of change in properties of the objects made of plastics [27]. Verification of the color correct choice is carried out with the use of a number of measurement devices for determination of characteristics of colors and is explicitly described in literature [8,24,28].…”

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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“…Pierwsze zespo³y Z-O by³y napêdzane rêcznie; zast¹piono je wkrótce konstrukcjami o napêdzie mechanicznym i elektromechanicznym [7]. Mechaniczne zespo³y Z-O w takiej postaci nie znalaz³y szerszego zastosowania ze wzglêdu na skomplikowan¹ budowê, z³o¿onooeae sterowania i regulacji oraz stosunkowo wysokie koszty wykonania [14]. Obecnie rozwój silników elektrycznych nowej generacji oraz zaawansowanych systemów sterowania komputerowego spowodowa³, ¿e zespo³y Z-O z napêdem elektromechanicznym zyska³y nowe, wysokie walory u¿ytkowe, staj¹c siê podstawowym rozwi¹zaniem konstrukcyjnym we wtryskarkach z niewielk¹ si³¹ zamykania, nazywanych umownie elektrycznymi.…”

Section: Wa¯niejsze Rozwi¥zania Konstrukcyjne Zespo£ów Zamykaj¥co-otwunclassified

Construction of clamping units of injection molding machines

Jachowicz

2005

Polimery

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CONSTRUCTION OF CLAMPING UNITS OF INJECTION MOLDING MACHINES Summary-Functions of clamping unit (Z-O) being a part of molding machine tool system have been presented. The factors characterizing the work and functional properties of Z-O unit were discussed. Criteria of such units' classification were defined and attempt to classify the units on the basis of these criteria has been done (Figs. 2-10). Currently used constructions of Z-O units were presented (Figs. 11, 12). The structure and principle of working of the latest or most characteristic Z-O units, in relation to particular groups of classification, as well as of uncharacteristic Z-O units showing interesting construction features (Figs. 13-15) were described. Additionally, the factors determining the changes in Z-O units constructions, the effect of construction on the performance characteristic as well as the latest trends in such units design (automation) were presented.

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Methods of forecasting of the changes of polymeric products properties

Cited by 10 publications

References 2 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

Construction of clamping units of injection molding machines

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