Thermal oxidation of metallocene ethylene-1-olefin copolymer films during one year oven aging

Acevedo, Mario Escudero; Quijada, Raúl; Vallette, Marcelo Campos

doi:10.1016/j.polymdegradstab.2008.06.017

Cited by 12 publications

(4 citation statements)

References 16 publications

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“…Figure 11). Chain scission is therefore the preponderant mechanism [15,16,59]. However, the decrease in the gel fraction is much smaller in the case of the samples thermo-oxidized for 3000 h at 60°C, likely because the degree of the advancement of oxidation reactions (given the chosen ageing times) is lower than that of the samples thermo-oxidized at 90°C and 110°C.…”

Section: Macromolecular Architecturementioning

confidence: 99%

“…Thus, the macromolecular architecture is strongly impacted [7,8], which, in combination with the influence of temperature on the crystalline morphology [9,10,11,12], has a strong influence on the mechanical behaviour [8,13,14]. Some studies have also reported that increasing the comonomer content increases not only the branching content (short chains branches) but also the oxidation rate [15,16]. In addition, when PE is crosslinked, chain scission modifies the architecture of the polymer network, and by providing more mobility to the chains, they can promote an increase in the material crystallinity [17,18,19].…”

Section: Introductionmentioning

confidence: 99%

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Consequences of thermo-oxidative ageing on the microstructure and mechanical properties of blends of polyethylenes with different butene contents

Rapp

Tireau²,

Bussière

et al. 2022

Polymer Degradation and Stability

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Section: Macromolecular Architecturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Consequences of thermo-oxidative ageing on the microstructure and mechanical properties of blends of polyethylenes with different butene contents

Rapp

Tireau²,

Bussière

et al. 2022

Polymer Degradation and Stability

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“…POE has easy processing, good chemical stability, good aging recyclability, and acoustic insulation performance [ 1 , 2 , 3 , 4 ], and POE foams are mainly used as cushioning and sealing materials. POE can be foamed by either chemical blowing agents [ 5 , 6 , 7 ] or physical blowing agents [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Insight into the Influence of Properties of Poly(Ethylene-co-octene) with Different Chain Structures on Their Cell Morphology and Dimensional Stability Foamed by Supercritical CO2

Chen

Yao

et al. 2021

Polymers

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Poly(ethylene-co-octene) (POE) elastomers with different copolymer compositions and molecular weight exhibit quite distinctive foaming behaviors and dimensional stability using supercritical carbon dioxide (CO2) as a blowing agent. As the octene content decreases from 16.54% to 4.48% with constant melting index of 1, both the melting point and crystallinity of POE increase, due to the increase in fraction of ethylene homo-polymerization segment. the foaming window of POE moves to a narrow higher temperature zone from 20–50 °C to 90–110 °C under 11 Mpa CO2 pressure, and CO2 solubility as well as CO2 desorption rate decrease, so that the average cell diameter becomes larger. POE foams with higher octene content have more serious shrinkage problem due to lower compression modulus, weaker crystal structure and higher CO2 permeability. As POE molecular weight increases at similar octene content, there is little effect on crystallization and CO2 diffusion behavior, the foaming window becomes wider and cell density increases, mainly owing to higher polymer melt strength, the volume shrinkage ratio of their foams is less than 20% because of similar higher polymer modulus. In addition, when the initiate expansion ratio is over 17 times, POE foams with longer and thinner cell wall structures are more prone to shrinkage and recovery during aging process, due to more bending deformation and less compression deformation.

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“…Thermal‐oxidative aging, the combined effects of oxygen and heat, is one of the main aging methods for polymer materials. It can lead to the auto‐oxidation scission of molecular chains, the changes of material structure, and ultimately the deterioration of whole performances . Therefore, it is significant to study the thermal‐oxidative effects on polymer materials.…”

Section: Introductionmentioning

confidence: 99%

Thermal oxidation and thermal degradation kinetics of brominated epoxy resin/Sb₂O₃ flame retardant PA10T/GF composites

Wang

Song

et al. 2017

Polymer Engineering & Sci

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In this article, the thermal-oxidative aging effects on short-glass-fiber reinforced PA10T composites (PA10T/GF) filled with brominated epoxy resin/Sb 2 O 3 (BER/AT) were investigated. The composites were exposed in a ventilated oven with different aging temperatures of 1608C, 2008C, and 2408C for 0-50 d. The results showed that the crystallinity decreased after aging, and the mechanical properties deteriorated due to the oxidation of PA10T resin and the reduction of interfacial adhesion as shown by Fourier-transform infrared spectroscopy and scanning electron microscope. The dynamic mechanical analysis revealed that the micro-crosslinking reactions happened during 1608C aging process and thus storage modulus increased as well as glass transition temperature (T g ). However, the molecular degradation dominated in the later phase of 2008C and 2408C aging; this resulted in the decrease of T g and the emergence of a large number of small molecules. The resin residue rate obtained from thermal gravimetric analysis increased after aging. After 30 d of aging at 2408C, the composites showed an obvious carbonization and the composite structure was destroyed severely. Also, the thermal stability of the composites decreased obviously when aged at 2008C for 30 and 50 d according to the kinetic analysis of thermal degradation. POLYM. ENG. SCI., 00:000-000, 2017.

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Thermal oxidation of metallocene ethylene-1-olefin copolymer films during one year oven aging

Cited by 12 publications

References 16 publications

Consequences of thermo-oxidative ageing on the microstructure and mechanical properties of blends of polyethylenes with different butene contents

Consequences of thermo-oxidative ageing on the microstructure and mechanical properties of blends of polyethylenes with different butene contents

Insight into the Influence of Properties of Poly(Ethylene-co-octene) with Different Chain Structures on Their Cell Morphology and Dimensional Stability Foamed by Supercritical CO2

Thermal oxidation and thermal degradation kinetics of brominated epoxy resin/Sb₂O₃ flame retardant PA10T/GF composites

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Thermal oxidation of metallocene ethylene-1-olefin copolymer films during one year oven aging

Cited by 12 publications

References 16 publications

Consequences of thermo-oxidative ageing on the microstructure and mechanical properties of blends of polyethylenes with different butene contents

Consequences of thermo-oxidative ageing on the microstructure and mechanical properties of blends of polyethylenes with different butene contents

Insight into the Influence of Properties of Poly(Ethylene-co-octene) with Different Chain Structures on Their Cell Morphology and Dimensional Stability Foamed by Supercritical CO2

Thermal oxidation and thermal degradation kinetics of brominated epoxy resin/Sb2O3 flame retardant PA10T/GF composites

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Thermal oxidation and thermal degradation kinetics of brominated epoxy resin/Sb₂O₃ flame retardant PA10T/GF composites