Effect of initial crystallinity on the response of high-density polyethylene to high-energy radiation

Failla, Marcelo Daniel; Vallés, Enrique M.; Lyons, B. J.

doi:10.1002/(sici)1097-4628(19990228)71:9<1375::aid-app3>3.0.co;2-j

Cited by 7 publications

(16 citation statements)

References 26 publications

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“…The crystallinity levels of the samples that were studied in this work, together with the amount of gel developed upon irradiation, are given in Table I. The gel results were already reported in a previous publication 13. We include them here for the purpose of facilitating the analysis of the mechanical results.…”

Section: Resultsmentioning

confidence: 99%

“…The gel and M w data indicate that the gel point was located in the dose range of 30–50 kGy for PE1 and in the dose range of 20–40 kGy for PE2. The critical dose for gel formation increased with the crystallinity for each polymer 13…”

Section: Resultsmentioning

confidence: 99%

“…The reduction in the efficiency of crosslinking with crystallinity was attributed to the scavenging of immobilized free radicals by oxygen, which took place when the samples were exposed to air during their manipulation for characterization 13…”

Section: Resultsmentioning

confidence: 99%

“…The enhancement of these properties is directly related to the intermolecular crosslinks that are produced by irradiation. It has been established that various factors exist that control the amount of crosslinks generated by the radiation process 7, 10–13. When the irradiation is performed at temperatures close to room temperature, that is, 25–30°C, the crystallinity level is one of the factors that affects the efficiency of crosslinking 10, 13.…”

Section: Introductionmentioning

confidence: 99%

“…It has been established that various factors exist that control the amount of crosslinks generated by the radiation process 7, 10–13. When the irradiation is performed at temperatures close to room temperature, that is, 25–30°C, the crystallinity level is one of the factors that affects the efficiency of crosslinking 10, 13. In a previous study, we presented results about the effect of the initial crystallinity on the efficiency of crosslinking, as measured from sol–gel relationships 13.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the temperature on the tensile mechanical behavior of irradiated linear polyethylene

Vallés

Failla

2003

J of Applied Polymer Sci

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ABSTRACT:The mechanical behavior of two ␥-irradiated linear polyethylenes was determined at 75 and 105°C under tensile stress. Each polymer was crystallized from the melt after different thermal histories so that samples would be obtained with various degrees of crystallinity. Subsequently, they were irradiated in vacuo and at room temperature to total doses ranging from 20 to 200 kGy. The initial crystallinity, dose level, and test temperature determined whether the samples displayed ductile, brittle, or transitional behavior. The yield stress decreased as the temperature increased. The value of the yield stress at a given temperature showed a tendency to increase with dose; this became more evident as the initial crystallinity increased. The extensibility of ductile samples, estimated from the draw ratio after break, decreased with the gel content. For ductile samples, the temperature affected the values of this property when the gel fraction that developed in the samples was relatively low. The effect of temperature became less noticeable when the gel reached values larger than 60%. The ultimate stress, normalized with the crosslinking density, correlated with the draw ratio after break in a way that resembled the type of relationship observed in other crosslinked systems.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of the temperature on the tensile mechanical behavior of irradiated linear polyethylene

Vallés

Failla

2003

J of Applied Polymer Sci

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Modification of Model Ethylene‐Butene Copolymers Using Gamma Radiation and an Organic Peroxide

Andreucetti¹,

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Failla

et al. 2006

Macromolecular Symposia

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Summary: Well-characterized linear ethylene-butene copolymers with polydispersities lower than 1.1 were modified using gamma radiation and an organic peroxide with the purpose of assessing the relative importance and form of evolution of the chain-linking processes with these two methods. The copolymers used in this work were obtained by hydrogenation of polybutadienes, which were synthesized by anionic polymerization of butadiene. Part of these materials were irradiated by gamma rays in a 60 Co radiation facility and the rest was modified with 2,5-dimethyl-2,5 di(terbutyl peroxy)-hexane in the molten state. As expected, the critical radiation dose and the critical concentration of peroxide required for the onset of gelation decreases with average molecular weight of the original copolymer. Although, the chain-linking reactions govern the modification process, there is a fraction of molecular chains that suffers scission. The measurable fraction of molecules having molecular weights lower than the original quasi-monodisperse copolymers is, for both processes, about 5% of the total modified polymer. On the post-gel region, the gel amount increases continuously with the radiation dose and the peroxide concentration added to the copolymers. For the radiation modified polymers, the calculation of the evolution of the molecular weights assuming ideal network forming conditions agreed very well with the experiments both, before and after the gel point. This is not accomplished when the modification process is done with the use of peroxides. Also, the results obtained from the peroxide modification processes at low relative concentrations with respect to the critical one for gelation show that the evolution of the structural modification evolves at a considerable lower rate than that observed in the radiation results.

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Friction and Wear Behavior of Irradiated Polyethylene Sliding Against a Rough Steel Surface

et al. 2014

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Effect of initial crystallinity on the response of high-density polyethylene to high-energy radiation

Cited by 7 publications

References 26 publications

Effect of the temperature on the tensile mechanical behavior of irradiated linear polyethylene

Effect of the temperature on the tensile mechanical behavior of irradiated linear polyethylene

Modification of Model Ethylene‐Butene Copolymers Using Gamma Radiation and an Organic Peroxide

Friction and Wear Behavior of Irradiated Polyethylene Sliding Against a Rough Steel Surface

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