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

Rapp, Géraldine; Tireau, Jonathan; Bussière, Pierre‐Olivier; Chenal, Jean-Marc; Gardette, Jean‐Luc; Thérias, Sandrine; Chazeau, Laurent

doi:10.1016/j.polymdegradstab.2022.110121

Cited by 2 publications

(1 citation statement)

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“…The characterization of material viability involves the description of mechanical properties that define the intimate cohesion and integrity of material. The availability of polyethylene to be crosslinked under the action of γ-radiation may be compared with the behavior of polyethylene structures containing a certain degree of unsaturation [ 73 ]. Figure 10 illustrates some mechanical properties measured for LDPE-based composites.…”

Section: Resultsmentioning

confidence: 99%

Structural Insights into LDPE/UHMWPE Blends Processed by γ-Irradiation

Zaharescu¹,

Nicula²,

Râpă

et al. 2023

Polymers

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Ultra-high-molecular-weight polyethylene (UHMWPE) matrices containing low-density polyethylene (LDPE), hydroxyapatite (HAp) as filler, and rosemary extract (RM) as stabilizer were investigated for their qualification for long-term applications. The significant contributions of the blend components were analyzed, and variations in mechanical properties, oxidation strength, thermal behavior, crystallinity, and wettability were discussed. SEM images of microstructural peculiarities completed the introspective survey. The stability improvement due to the presence of both additives was an increase in the total degradation period of 67% in comparison with an unmodified HDPE/UHMWPE blend when the materials were subjected to a 50 kGy γ-dose. There was growth in activation energies from 121 kJ mol−1 to 139 kJ mol−1 when HAp and rosemary extract delayed oxidation. The exposure of samples to the action of γ-rays was found to be a proper procedure for accomplishing accelerated oxidative degradation. The presence of rosemary extract and HAp powder significantly increased the thermal and oxidation resistances. The calculation of material lifetimes at various temperatures provided meaningful information on the wearability and integrity of the inspected composites.

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Section: Resultsmentioning

confidence: 99%