Metallocene ethylene‐<i>co</i>‐(5,7‐dimethylocta‐1, 6‐diene) copolymers crosslinked using electron beam irradiation: a tunable alternative

Cerrada, María L.; Benavente, Rosario; Pérez, Ernesto; Campos, Jorge; Ribeiro, M. Rosário

doi:10.1002/pi.3082

Cited by 7 publications

(2 citation statements)

References 31 publications

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“…These trends for PCL are similar to those found for other semicrystalline polymers. For PE irradiated up to 233 kGy, M p and crystallinity remained almost unchanged and T c decreased slightly with the increase in dose [ 28 , 29 ], similar to PCLs in this study. These results were explained by the formation of crosslinking and branching taking place mainly on the amorphous regions and on the boundaries of crystallites, that affects the melting point but more strongly the crystallization temperature as the crosslinks disturbs the formation of crystals on cooling, leading to a delay on the crystallization.…”

Section: Resultssupporting

confidence: 65%

Effect of Ionizing Radiation on the Chemical Structure and the Physical Properties of Polycaprolactones of Different Molecular Weight

et al. 2018

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Polymers used in the biomedical sector can be exposed to ionizing radiation (X-ray, gamma) in vivo as implants or ex vivo for sterilization purposes (gamma, electron beam). This ionizing radiation can, at certain levels, cause degradation of the polymer. Polycaprolactones (PCL) of different molecular weights were irradiated with electron beam and the changes in their chemical structure and physical properties with the dose were evaluated. Electron beam irradiation produced crosslinking and chain scission in the PCL chain without significant predominance of one mechanism over the other. Minimum dose for gelation decreased with the increase in PCL molecular weight whereas crosslinking efficiency was almost independent of PCL molecular weight. Carboxylic groups, hydroxyl groups and new saturated hydrocarbon species were detected by proton nuclear magnetic resonance (NMR). These species were consistent with a mechanism where chain scission could take place at any bond in the PCL chain with preference in the –COO–CH2– bond. Crosslinking decreased significantly the crystallization temperature of PCL. Tensile properties decreased continuously with the increase in dose. Irradiation with gamma rays produced a faster decay in mechanical properties than electron beam.

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Section: Resultssupporting

confidence: 65%

Effect of Ionizing Radiation on the Chemical Structure and the Physical Properties of Polycaprolactones of Different Molecular Weight

et al. 2018

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“…Dimensional stability, increased thermal, physical and chemical stability and an ability to store information about their shape and formation history when the gel point is surpassed are the properties that can be improved by crosslinking . There are many methods for crosslinking polymers such as peroxide crosslinking, crosslinking by irradiation and silane crosslinking . Crosslinking of EOCs has been carried out by all the above methods.…”

Section: Introductionmentioning

confidence: 99%

Effect of octene content on peroxide crosslinking of ethylene–octene copolymers

Svoboda¹,

Poongavalappil²,

Theravalappil³

et al. 2012

Polymer International

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Various ethylene–octene copolymers were crosslinked by dicumyl peroxide. Octene content was 16, 20, 30, 35 and 38 wt% and melt flow index was 1 or 3 g/10 min. The concentration of dicumyl peroxide was 0.3, 0.5 and 0.7 wt%. Crosslinking was analyzed by a rubber process analyzer in the temperature range 150–200 °C. Cross‐linkability was evaluated from the real part modulus s'max versus peroxide level plots as the slope of the line. With decreasing octene content and increasing melt flow index the crosslinkability increased. This was confirmed also by tan δ analysis. The network density was measured by the gel content. A higher gel content was found for melt flow index 3 and low octene content. The melting points Tm and the crystallinities were evaluated by DSC. © 2012 Society of Chemical Industry

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Enhanced thermal property and anti-moisture absorption of PA6/P (N-(4-carboxyphenyl)maleimide-alt-triallyl isocyanurate) composites based on solid-state interfacial reaction

Liu

Jiang

Yan

et al. 2020

Journal of Materials Research and Technology

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Metallocene ethylene‐co‐(5,7‐dimethylocta‐1, 6‐diene) copolymers crosslinked using electron beam irradiation: a tunable alternative

Abstract: Ethylene-co-5,7-dimethylocta-1,6-diene copolymers (CEDMO) with different molar DMO contents incorporate double bonds in the lateral chains that facilitate the development of

Cited by 7 publications

References 31 publications

Effect of Ionizing Radiation on the Chemical Structure and the Physical Properties of Polycaprolactones of Different Molecular Weight

Effect of Ionizing Radiation on the Chemical Structure and the Physical Properties of Polycaprolactones of Different Molecular Weight

Effect of octene content on peroxide crosslinking of ethylene–octene copolymers

Enhanced thermal property and anti-moisture absorption of PA6/P (N-(4-carboxyphenyl)maleimide-alt-triallyl isocyanurate) composites based on solid-state interfacial reaction

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