Effects of coloration on the physical and mechanical properties and on the thermal stability of polyoxymethylene

Archodoulaki, Vasiliki‐Maria; Lüftl, Sigrid; Seidler, Sabine

doi:10.1002/adv.20060

Cited by 8 publications

(11 citation statements)

References 13 publications

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“…Podobnie jak fenole, równie¿ aminy bior¹ udzia³ w reakcji przeniesienia wodoru do wolnego rodnika. Skutecznooeae dzia³ania amin zale¿y od budowy ich cz¹steczki, przede wszystkim od rodzaju podstawników [83,[108][109][110][111]. Wa¿n¹ grupê stanowi¹ aminy cykliczne z du-¿ymi podstawnikami stanowi¹cymi przeszkody steryczne (sterically hindered amine).…”

Section: Stabilizacjaunclassified

Degradation and stabilization of thermoplastic ether-ester elastomers (TPE-E)

Szymczyk¹,

Rosłaniec²

2006

Polimery

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Degradacja i stabilizacja termoplastycznych elastomerów eterowo-estrowych Streszczenie-Na podstawie danych literaturowych i prac w³asnych (144 pozycje pochodz¹ce w przewa¿aj¹cej czêoeci z ostatnich 20 lat) przedstawiono przegl¹d mo¿liwych mechanizmów degradacji termicznej i termooksydacyjnej termoplastycznych elastomerów poli(eterowo-estrowych) (TPE-E). Do grupy tej, oprócz handlowych kopoli(etero-estrów), opartych na PBT, PBN, PEOX i PTMO, zaliczono wiele kopolimerów blokowych ró¿ni¹cych siê budow¹ segmentów-ugrupowanie estrowe, oprócz innych grup funkcyjnych, mo¿e wystêpowaae w segmencie zarówno sztywnym, jak i giêtkim. Czas ¿ycia TPE-E zale¿y od procesów utleniania oraz termicznej degradacji, przewa¿nie postêpuj¹cych niezale¿nie od siebie. Termiczne utlenianie elastomerów estrowych mo¿e mieae miejsce na ka¿dym etapie ich cyklu ¿ycia: podczas syntezy, przetwórstwa a tak¿e przechowywania i u¿ytkowania gotowych wyrobów. Porównano wp³yw wprowadzenia ró¿norodnych dodatków na procesy rozk³adu i starzenia TPE-E. Dziêki odpowiedniemu doborowi stabilizatorów i przeciwutleniaczy oraz wyjoeciowych substratów mo¿na uzyskaae materia³y charakteryzuj¹ce siê doskona³ymi w³aoeciwooeciami u¿ytkowymi i znaczn¹ odpornooeci¹ na oddzia³ywanie ró¿nych warunków oerodowiska. S³owa kluczowe: termoplastyczne elastomery eterowo-estrowe, budowa chemiczna, degradacja termooksydacyjna, stabilizacja. DEGRADATION AND STABILIZATION OF THERMOPLASTIC ETHER-ESTER ELASTOMERS (TPE-E) Summary-Based on the literature data (144 references mainly from the last 20 years) and own results the review of possible mechanisms of thermal or thermooxidative degradation of polyester thermoplastic elastomers (TPE-E) are reported. A lot of block copolymers differing in the structure of segments are included into this group, among others the commercial copoly(ether-esters) based on PBT, PBN, PEOX or PTMO. The ester group, apart from the other functional groups, can occur as well in the hard and flexible segments. The lifetime of TPE-E is controlled by both oxidation and thermal degradation processes, mostly proceeding independently. Thermal oxidation of ester elastomers may occur during every stage of their life cycles (Fig. 1-6): during the synthesis, processing, storage or use of the final goods. The influence of introduction of various additives on the processes of decomposition and ageing of TPE-E (Fig. 7-10) were compared. The proper choice of stabilizers and antioxidants as well as initial substrates let obtain the materials showing excellent useful properties and high resistance to various environmental conditions.

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Section: Stabilizacjaunclassified

Degradation and stabilization of thermoplastic ether-ester elastomers (TPE-E)

Szymczyk¹,

Rosłaniec²

2006

Polimery

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“…For the tribologic properties of POM parts, it was determined in pin-on-disk-tests, that a finer morphology correlates with lower wear rates [10]. Furthermore, while there has been evidence of nucleating effects of TiO 2 on POM [7], in general there have also been findings of denucleating effects of colourants on POM [11], suggesting the possibility of a decrease in mechanical and tribological properties as a result of incompatible colourants. Due to the complex interactions, it cannot easily be predicted whether a material has a nucleating, denucleating or no effect on the base polymer.…”

Section: Introductionmentioning

confidence: 99%

Influence of titanium oxide-based colourants on the morphological and tribomechanical properties of injection-moulded polyoxymethylene spur gears

Schubert

Hertle

Drummer

2019

Journal of Polymer Engineering

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Abstract Regardless of colouration for functional or aesthetic purposes, technical polymer parts, like gears, require consistent properties. However, there is a lack of research into the effect of colourants on the tribomechanical properties of gears. Therefore, the effects of two pigments, titanium dioxide (white) and chrome antimony titanium oxide (yellow), and three delivery methods, masterbatch, liquid colour and direct compounding, on part morphology, dimensions, tribological and mechanical performance of injection-moulded polyoxymethylene (POM) spur gears are investigated in this paper. The white pigment accelerates the crystallisation of POM, causing fine and highly-crystalline morphological structures and smaller dimensions. However, the yellow pigment decelerates crystallisation, resulting in a coarser morphology with highly crystalline core material and bigger parts. Furthermore, the delivery method affects only the tribomechanical properties. Using a masterbatch decreases loads at break and increases deflection at break, since the carrier material acts as an impact modifier and a weak spot. The liquid colour decreases wear due to lubricating properties, whereas the pure pigments increases abrasion, especially in combination with a coarse microstructure. However, the effects of carrier systems and changes in morphology are always superimposed. Considering the performance and tolerance of technical components, colourants have to be carefully selected to ensure beneficial properties.

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“…The ageing behaviour of POM was reported in some studies. 1–9 The changes in the solid-state structure, surface molecular weight, tensile properties and impact properties of POM after ultraviolet (UV) ageing were determined by Wu et al. 2 Archodoulaki et al.…”

Section: Introductionmentioning

confidence: 99%

“…2 Archodoulaki et al. 3 studied the influence of coloration on mechanical and physical properties and its effect on the thermal and UV irradiation ageing behaviour of POM polymer. Differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), melt volume rate, pressure oxidative induction time studies and perforation tests were conducted at aged samples.…”

Section: Introductionmentioning

confidence: 99%

Thermal and water ageing effect on mechanical, rheological and morphological properties of glass-fibre-reinforced poly(oxymethylene) composite

Kuram

2018

Proceedings of the Institution of Mechanical Engineers, Part E:

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In this study, the ageing behaviour of glass-fibre-reinforced poly(oxymethylene) composite at different conditions was investigated. The ageing was performed in various controlled environments, namely in air at room temperature, in water at room temperature and in an oven at the temperature of 100 ℃. Tensile and flexural tests were conducted to determine the mechanical properties, melt flow index was measured to determine the rheological property and scanning electron microscopy was used to observe the morphological property of unaged and aged poly(oxymethylene) samples. A reduction in both tensile and flexural strength was observed with all ageing environment. The worst strength retention was obtained with water ageing. Water absorbed by glass-fibre-reinforced poly(oxymethylene) composite had a detrimental influence on the tensile and flexural strength. Tensile strength was affected by the ageing environments. The decrease in the tensile strength of air and thermally aged poly(oxymethylene) was slower than that of water aged poly(oxymethylene), and the tensile strength of aged samples decreased as the ageing time increased. The combined actions of heat, air and water (thermal + water + air ageing) did not further degrade glass-fibre-reinforced poly(oxymethylene) compared to only water ageing at the room temperature. All tensile stress–strain and flexural load–deflection curves showed the similar tendency and did not change with ageing environments and time. All aged samples showed higher melt flow index values than that of unaged sample and the changes in melt flow index could be an indicator of degradation.

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Effects of coloration on the physical and mechanical properties and on the thermal stability of polyoxymethylene

Cited by 8 publications

References 13 publications

Degradation and stabilization of thermoplastic ether-ester elastomers (TPE-E)

Degradation and stabilization of thermoplastic ether-ester elastomers (TPE-E)

Influence of titanium oxide-based colourants on the morphological and tribomechanical properties of injection-moulded polyoxymethylene spur gears

Thermal and water ageing effect on mechanical, rheological and morphological properties of glass-fibre-reinforced poly(oxymethylene) composite

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