Experimental Investigation of the Properties of High-Density Polyethylene after Gamma Irradiation

Suarez, João Carlos Miguez; Monteiro, Elisabeth Ermel da Costa; Biasi, R.S. de; Mano, Eloisa B.

doi:10.1515/polyeng.2003.23.2.95

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…Increasing radiation doses enhanced the transition to microgels, and finally, continuous network could only be attained if both parameters were sufficiently high. Suarez et al 8 compared various techniques for studying the properties of gamma irradiated HDPE -SEC, FTIR, optical absorption in the IR range, ESR, DSC, gel content, Rockwell hardness testing and SEM. They showed that gel content, hardness, molecular weight and morphology are significantly affected by irradiation in terms of structural changes in the polymer as a result of the production of free radicals and to a balance between crosslinking and chain scission.…”

Section: Introductionmentioning

confidence: 99%

Effect of UV light, electron beam and gamma irradiation on capillary flow of LLDPE and LLDPE filled with sericite–tridymite–cristobalite

Honek¹,

Hausnerová²,

Sáha³

et al. 2004

Plastics, Rubber and Composites

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The rheological properties of linear low density polyethylene (LLDPE) were modified by irradiation in order to reduce or eliminate the unstable region (spurt) on the flow curve. Three different types of irradiation source (gamma ray, electron beam and UV light) were used to introduce the oxygencontaining groups into molecular chains of LLDPE, and consequently attain chain scission without any chemical additives resulting in smooth flow without any evidence of instability. This was proved by FTIR and contact angle measurements. Further, irradiation treatment should lead to increased polarity of polyethylene, and thus to increased adhesion between the polymer and polar fillers. Therefore, LLDPE filled with sericite-tridymite-cristobalite (STC) was investigated. Although the viscosity changes were rather negligible, a positive effect was seen during mixing, where torque, necessary to disperse the powder homogeneously in the polymer melt, was dramatically reduced, especially in the case of gamma-irradiated samples.

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Section: Introductionmentioning

confidence: 99%

Effect of UV light, electron beam and gamma irradiation on capillary flow of LLDPE and LLDPE filled with sericite–tridymite–cristobalite

Honek¹,

Hausnerová²,

Sáha³

et al. 2004

Plastics, Rubber and Composites

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Investigation of radiation-induced aromatization in high-density polyethylene and the product formations mechanism using molecular spectroscopy

Prasad

2024

Radiation Effects and Defects in Solids

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Correlation of Mechanical and Chemical Changes in Gamma-Irradiated Ultra-High Molecular Weight Polyethylene

Suarez¹,

Elzubair²,

Bonelli³

et al. 2005

Journal of Polymer Engineering

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Ultra-high molecular weight polyethylene (UHMWPE) is used in the manufacture of several products due to its excellent engineering propertieshigh tensile and impact strength, low friction coefficient, resistance to chemical attack and biocompatibility. It is well known that gamma irradiation introduces structural changes that may be detrimental to the integrity and performance of the polymer, limiting its useful life. Plates manufactured with commercial, general-grade, UHMWPE were exposed to several doses of gamma radiation at room temperature in air. The structural changes of the plates were investigated by gel content determination, mechanical testing (hardness, tension and impact), differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), wide angle X-ray diffraction (WAXD), electron spin resonance (ESR) and scanning electron microscopy (SEM). Experimental results show crosslinking and an increase in crystallinity. More significant changes are observed in samples irradiated with higher doses: chain scission induced by oxidation changes the molecular structure, degrades the mechanical properties and changes the fracture mechanism from ductile to brittle.

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Experimental Investigation of the Properties of High-Density Polyethylene after Gamma Irradiation

Cited by 3 publications

References 13 publications

Effect of UV light, electron beam and gamma irradiation on capillary flow of LLDPE and LLDPE filled with sericite–tridymite–cristobalite

Effect of UV light, electron beam and gamma irradiation on capillary flow of LLDPE and LLDPE filled with sericite–tridymite–cristobalite

Investigation of radiation-induced aromatization in high-density polyethylene and the product formations mechanism using molecular spectroscopy

Correlation of Mechanical and Chemical Changes in Gamma-Irradiated Ultra-High Molecular Weight Polyethylene

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