Thermal-oxidative stability of radiation-crosslinked polyethylene-compounds for wire and cable insulations

Wiedenmann, R.

doi:10.1016/0146-5724(77)90183-2

Cited by 10 publications

(2 citation statements)

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“…In fact TMPTA possesses higher number of reactive double bonds than TAC (Waldron et al, 1985). R. Wiedenmann reports that there are so many unreacted double bonds in TAC-blended PE after irradiation (Wiedenmann, 1977). A similar trend is observed for TMPTA and TAC added LE28 samples, which exhibits 75.58, 89.19 and 93.95% and 72.26, 85.98 and 92.03% gel content at above-mentioned doses.…”

Section: Gel Fraction Analysissupporting

confidence: 65%

Influence of Electron Beam Treatment on the Crystallization and Thermal Stability of Ldpe/Epdm Blends

Sharma¹,

Chowdhury²,

Mahanwar³

et al. 2014

American Journal of Engineering and Applied Sciences

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The effect of blend composition and Electron Beam (EB) irradiation on the crystallization and thermal behavior of Low Density Polyethylene (LDPE)/Ethylene-Propylene-Diene elastomer (EPDM) blends had been studied. Melting temperatures were found to remain unchanged upon variation of blend composition as well as irradiation dose. But the degree of crystallinity and T c (crystallization temperature) were decreased with increase in EPDM content and EB dose. On the other hand, thermal stability (in terms of onset temperature and degradation temperature) and activation energy were increased with increase in EPDM content and irradiation dose. But the speed of degradation slowed down with increasing EPDM content and EB dose. Interestingly, once Trimethylolpropane Triacrylate (TMPTA) and Triallyl Cynuerate (TAC) were incorporated into the blends, the degrees of change of these properties were more in same direction upon irradiation. At higher irradiation dose properties were demoted due to chain scission.

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Section: Gel Fraction Analysissupporting

confidence: 65%

Influence of Electron Beam Treatment on the Crystallization and Thermal Stability of Ldpe/Epdm Blends

Sharma¹,

Chowdhury²,

Mahanwar³

et al. 2014

American Journal of Engineering and Applied Sciences

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show abstract

“…In fact, TMPTA possesses higher number of reactive double bonds than TAC. 22 Wiedenmann 23 also reported that there were so many unreacted double bonds in TAC-blended PE after irradiation. A similar trend was observed for TMPTA and TAC-added LE 28 samples, which exhibited 75.58, 89.19 and 93.95, and 72.26, 85.98 and 92.03% gel content at above-mentioned doses.…”

Section: Gel Fraction Analysismentioning

confidence: 99%

Tensile, flexural and morphological properties of electron beam-crosslinked LDPE–EPDM blends

Chowdhury

Sharma

Mahanwar

et al. 2015

Plastics, Rubber and Composites

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The effect of electron beam (EB) irradiation on the tensile, flexural and morphological properties of low-density polyethylene (LDPE)/ethylene-propylene diene elastomer (EPDM) blends had been studied in the absence and presence of crosslink promoters, such as trimethylolpropane triacrylate (TMPTA) and triallyl cyanurate (TAC). Blends were prepared by melt mixing of LDPE and EPDM followed by EB irradiation at various doses. The gel fraction (%) of irradiated blends was increased with an increase in EPDM content as well as EB irradiation dose and consequently the tensile and flexural properties of the blends increased. The incorporation of crosslinking promoters accelerated the gel formation and improved the properties upon irradiation more efficiently. The phase morphology of fractured surface displayed immiscibility with a rough appearance before irradiation. But after irradiation, the surface became fine, smooth and uniform, which went on increasing upon irradiation, supporting the steady increase in mechanical properties. Surface appeared even smoother in the presence of TMPTA and TAC.

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Molecular structure and physical properties of E‐beam crosslinked low‐density polyethylene for wire and cable insulation applications

Dadbin¹,

Frounchi²,

Minaei³

et al. 2002

J of Applied Polymer Sci

100

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ABSTRACT:Crosslinking of homemade low-density polyethylene (LDPE) was performed by electron-beam (EB) irradiation. The gel content of the EB-exposed LDPE was determined by the solvent-extraction method. The degree of crosslinking was also evaluated by a hot set measuring test. The results obtained from both the gel-sol and the hot set methods showed that the degree of crosslinking was dependent on the deposited energy in LDPE samples. Increasing the absorbed dose increased the degree of network formation. The LDPE with higher molecular weight yielded higher efficiency of crosslinking at the same irradiation dose. The effect of irradiation dose on the molecular weight between crosslinks (M c ), glass-transition temperature, and free volume were calculated. Mechanical test results showed that the tensile strength of the samples increased with increase in the irradiation dose up to 150 kGy and then slightly decreased with further increasing the deposited energy. The elongation at break decreased with increasing the absorbed dose. The results obtained from differential scanning calorimetry exhibited a small reduction in the melting point and the degree of crystallinity of the EB-exposed LDPE samples compared to those of the untreated samples. The effect of crosslinking on the electrical properties of the irradiated samples was insignificant. The dielectric constant of the treated samples remained nearly constant within the irradiation dose range, although the dissipation factor increased slightly with increasing the absorbed dose. The results obtained from characterizing the EB-induced crosslinking of homemade polyethylene, including LH0030 and LH0075, showed the higher molecular weight polyethylene (LH0030) as a preferred option for wire and cable insulation.

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Thermal-oxidative stability of radiation-crosslinked polyethylene-compounds for wire and cable insulations

Cited by 10 publications

References 0 publications

Influence of Electron Beam Treatment on the Crystallization and Thermal Stability of Ldpe/Epdm Blends

Influence of Electron Beam Treatment on the Crystallization and Thermal Stability of Ldpe/Epdm Blends

Tensile, flexural and morphological properties of electron beam-crosslinked LDPE–EPDM blends

Molecular structure and physical properties of E‐beam crosslinked low‐density polyethylene for wire and cable insulation applications

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