Thermal oxidative degradation of polypropylene-containing pro-oxidants

Carvalho, C. L. de; Rosa, Derval dos Santos

doi:10.1007/s10973-013-3490-8

Cited by 7 publications

(2 citation statements)

References 18 publications

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“…Here, EPC has an activation energy of 239 kJ/mol, which is 2.5 times the activation energy of EPP with 97.2 kJ/mol. This explains the lower oxidation resistance of EPP compared with EPC, which is consistent with the literature where values of 50, 22 115 23 and 124 kJ/mol 24 were found for compact polypropylene and values of 213 kJ/mol for compact polycarbonate. The higher value of EPC can be explained by the aromatic structure of EPC, which is generally less susceptible to oxidation.…”

Section: Resultssupporting

confidence: 92%

Influence of thermo‐oxidative aging on the mechanical properties of the bead foams made of polycarbonate and polypropylene

Weingart,

Raps,

Lamka

et al. 2023

Journal of Polymer Science

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Bead foams made from standard polymers such as expanded polystyrene (EPS) or expanded polypropylene (EPP) are widely used in everyday products. In order to expand the application window of bead foams, the industry, such as the automotive industry among others, is striving for higher‐performance materials to create a lightweight material for high‐temperature applications. New bead foams such as expanded polycarbonate (EPC) are emerging to offer a wider range of solutions, with thermo‐mechanical properties constantly improving. EPC has excellent mechanical properties, which has been shown in our previous work. To fully understand the capabilities of a material for high‐temperature applications, it is important to know what happens when it is exposed to conditions, that lead to aging. Morphological studies, as well as mechanical characterizations help to determine the properties of EPC compared to EPP. Since thermo‐oxidative aging of thermoplastic foams is almost unexplored, especially in the field of bead foams, this research represents an important contribution to the understanding of material behavior and development. Time‐consuming aging tests were able to confirm that EPC is not only a very thermally stable material, but also able to provide reasonable mechanical performance after aging, compared to EPP.

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Section: Resultssupporting

confidence: 92%

Influence of thermo‐oxidative aging on the mechanical properties of the bead foams made of polycarbonate and polypropylene

Weingart,

Raps,

Lamka

et al. 2023

Journal of Polymer Science

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“…Many studies on the thermo-oxidative ageing and dynamic mechanical analysis (DMA) of polymer composites have been reported including physical, substantial damage accrues, chemical and interface degradation. 11 –19 With the effect of thermo-oxidative ageing, the cross-linking, degradation of polymer matrix and the interface debonding can lead to the variations of static and dynamic mechanical properties, crystallinity ( X c ) and thermal stabilities.…”

Section: Introductionmentioning

confidence: 99%

The evolution of morphology, crystallization and static and dynamic mechanical properties of long glass-fibre–reinforced polypropylene composites under thermo-oxidative ageing

Zhang

et al. 2018

Journal of Thermoplastic Composite Materials

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In this work, the static and dynamic mechanical properties, crystallization behaviours, and morphology of long glass-fibre–reinforced polypropylene (PP) composites with thermo-oxidative ageing time from 0 day to 50 days at 120°C were investigated and discussed. The static mechanical properties showed a global decrease in tensile, bending and impact strengths with increasing ageing time. From the results obtained by scanning electronic microscopic observations, interface debonding clearly occurred between the glass fibre and PP matrix in the aged samples. The crystallinity ( Xc) of the composites was analyzed by differential scanning calorimetry; annealing process played the leading role in the early period of ageing, while as ageing progressed, the degradation of PP matrix dominated the ageing process and Xc decreased. The dynamic mechanical analysis results indicated that the storage modulus and glass transition temperature of the composites also decreased with prolonging ageing time. Then, the apparent activation energy ( E) of glass transition was calculated by the Arrhenius equation with different scanning frequencies. A higher value of E was obtained for the samples in the later ageing period, which means a higher energy barrier for glass transition.

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Biodegradable Composites: Properties and Uses

Rocha

Rosa

2017

Handbook of Composites From Renewable Materials

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Thermal oxidative degradation of polypropylene-containing pro-oxidants

Cited by 7 publications

References 18 publications

Influence of thermo‐oxidative aging on the mechanical properties of the bead foams made of polycarbonate and polypropylene

Influence of thermo‐oxidative aging on the mechanical properties of the bead foams made of polycarbonate and polypropylene

The evolution of morphology, crystallization and static and dynamic mechanical properties of long glass-fibre–reinforced polypropylene composites under thermo-oxidative ageing

Biodegradable Composites: Properties and Uses

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