Silane grafting and moisture crosslinking of polyethylene: The effect of molecular structure

Azizi, Hamed; Morshedian, Jalil; Barikani, Mehdi

doi:10.1002/vnl.20194

Cited by 20 publications

(15 citation statements)

References 17 publications

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“…The molecular structure of a PE is an important characteristic influencing the physical and chemical properties. It has been reported that the structural parameters such as number average molecular weight, the molecular weight distribution, the presence of unsaturated functional groups (vinyl groups), and the content of branches as well as their length had important effects in the crosslinking/grafting behavior of PEs 20–23…”

Section: Introductionmentioning

confidence: 99%

Effects of organic peroxide and polymer chain structure on mechanical and dynamic mechanical properties of sisal fiber reinforced polyethylene composites

Ahmad

Luyt

2012

J of Applied Polymer Sci

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Three types of polyethylene (PE), low‐density PE (LDPE), linear low‐density PE (LLDPE), and high‐density PE (HDPE) were used as polymer matrices to prepare untreated as well as dicumyl peroxide (DCP) treated sisal fiber composites. The effect of polymer chain structure, addition of DCP, and sisal fiber loadings on the mechanical and dynamic mechanical properties of the composite was investigated in this study. It was found that the extent of improvement in tensile properties of the composite samples varied with respect to the polymer molecular characteristics. The elongation at break for all the composites decreased significantly. Young's modulus and the tensile strength of the treated LDPE and LLDPE composites increased significantly compared with the untreated composites, whereas Young's modulus of the treated HDPE samples decreased observably compared with the untreated samples. DCP treatment, however, did not change the tensile strength of HDPE and its composites. The storage modulus results for all the PE composites correlate well with the tensile testing results. In the case of the LDPE and LLDPE samples, the curves of the mechanical loss factor (tan δ) show a clear relaxation around −18°C, which shifted to higher temperature in the treated composites, whereas for HDPE this transition was not seen. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

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Section: Introductionmentioning

confidence: 99%

Effects of organic peroxide and polymer chain structure on mechanical and dynamic mechanical properties of sisal fiber reinforced polyethylene composites

Ahmad

Luyt

2012

J of Applied Polymer Sci

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“…In our previous study, it was shown that the rate of crosslinking for LDPE is higher than those of LLDPE and HDPE because of lower crystallinity. 31 The lower gel content for HDPE may be attributed to the …”

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confidence: 99%

Correlation between molecular structure parameters and network properties of silane‐grafted and moisture cross‐linked polyethylenes

et al. 2011

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ABSTRACT:The degree of silane grafting and cross-linking of several high-density polyethylenes (HDPE) was studied. The results are compared with those of a low-density polyethylene (LDPE) and a linear low-density polyethylene (LLDPE). Molecular characterization was done by gel permeation chromatography. The differences in grafting and cross-linking performance are correlated to the different structural parameters of the polymers such as molecular weight, molecular weight distribution, polydispersity index (PDI), and branching. The results show that molecular weight plays the main role in silane-grafting and cross-linking performance. For samples with approximately similar PDI, the grafting level increased with both increasing number average molecular weight and weight average molecular weight, whereas the gel content increased with increasing weight average molecular weight. However, a zigzag relation was observed for the variation of grafting and cross-linking performances

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“…Different substances, such as peroxides [7], silanes [8][9][10] or ionizing radiations [11][12][13][14], are regularly used as crosslinking agents. The resulted crosslinked materials have widely applied in cable industry due to their excellent dielectric properties, better water-tree resistance and suitable thermo-mechanical behavior [5,15]. However, the long-term performances of these materials are affected by oxidative degradation which is induced by combined environmental actions (heat transfer, photooxidative or high energy radiation exposures, mechanical loadings) which have energy transfer reasons usually accompanied by electrical stresses during the service life.…”

Section: Introductionmentioning

confidence: 99%

Copper diffusion in cable-insulating materials by chemiluminescence and DSC techniques

Jipa

Setnescu

Zaharescu³

et al. 2015

J Therm Anal Calorim

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Chemiluminescence (CL) and differential scanning calorimetry (DSC) were applied for proving the copper ion migration processes occurring within the lowdensity polyethylene (LDPE) electrical insulator as a consequence of intimate contact. Thin LDPE slides of 0.5 mm thick were subjected to short-time thermal stress at temperatures between 80 and 120°C. Both CL and DSC kinetic parameters revealed the acceleration of posttreatment oxidation at elevated temperatures (170-200°C) in copper-contacting polymer as in respect to the cases when Cu was absent. It was revealed that the oxidation rate measured by CL was more than two times higher for the samples heated in the presence of Cu than in its absence, while the oxidation induction time from DSC was considerably lowered for the same samples. Elemental analysis data provided by atomic absorption spectroscopy and particle-induced X-ray emission techniques as well as SEM investigations confirmed the presence of copper within the samples subjected to thermal treatment when the polymer insulation was in contact with the metallic conductor. Chemiluminescence procedure has a remarkable sensitivity to detect the effect of copper in the polymer matrix even at low concentrations.

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Silane grafting and moisture crosslinking of polyethylene: The effect of molecular structure

Cited by 20 publications

References 17 publications

Effects of organic peroxide and polymer chain structure on mechanical and dynamic mechanical properties of sisal fiber reinforced polyethylene composites

Effects of organic peroxide and polymer chain structure on mechanical and dynamic mechanical properties of sisal fiber reinforced polyethylene composites

Correlation between molecular structure parameters and network properties of silane‐grafted and moisture cross‐linked polyethylenes

Copper diffusion in cable-insulating materials by chemiluminescence and DSC techniques

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