Enhanced strain hardening in elongational viscosity for HDPE/crosslinked HDPE blend. I. Characteristics of crosslinked HDPE

Yamaguchi, Masayuki; Suzuki, Kenichi; Maeda, Shingo

doi:10.1002/app.10914

Cited by 31 publications

(23 citation statements)

References 12 publications

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“…Crosslinked PE forms a dense network of high molecular weight, which improves impact strength, environmental stress crack resistance (ESCR), creep, and abrasion resistance without influencing tensile strength and density to any appreciable extent. However, it increases the viscosity and decreases elongation at break 4–10…”

Section: Introductionmentioning

confidence: 99%

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Properties of high‐density polyethylene filled with waste crosslinked foam

Tamboli

Mhaske

Kale

2003

J of Applied Polymer Sci

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ABSTRACT:Crosslinked polyethylene foam is widely used in packaging and as an insulation material. Finely ground waste of such crosslinked foam mesh size 7 or particle size less than 2815 m is used as a filler in highdensity polyethylene (HDPE) of two different grades (7.5 and 21 MFI). Mechanical, thermal, and morphological properties of filled composites is studied experimentally. Waste foam powder concentration was varied up to 40% by weight basis. Impact strength of base HDPE increased by a factor of six. The overall changes in mechanical properties are similar to the crosslinking effect. It is believed that waste foam particles act as a point of entanglement with different chains of polyethylene.

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Section: Introductionmentioning

confidence: 99%

“…Disposal of crosslinked waste material is a compelling environmental issue. Using waste crosslinked PE as a filler in polyolefins could be advantageous, given that sufficient compatibility between filler and matrix would exist 8, 9. There is no reported work on the use of waste crosslinked polyolefins as a filler in polyolefins.…”

Section: Introductionmentioning

confidence: 99%

Properties of high‐density polyethylene filled with waste crosslinked foam

Tamboli

Mhaske

Kale

2003

J of Applied Polymer Sci

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“…Also, the loss tangent of XHDPE and decrosslinked XHDPE exhibits weak frequency dependence. Such dynamic rheological behavior is similar to a typical behavior of so-called "critical gel" [21][22][23][24][25][26][27] and "post critical gel" 21,28 within the frequency range below the rubbery plateau. The storage modulus of XHDPE and decrosslinked XHDPE is below the plateau modulus of HDPE.…”

Section: Dynamic Propertiesmentioning

confidence: 72%

Ultrasonic decrosslinking of crosslinked high-density polyethylene: effect of degree of crosslinking

Huang

Isayev

2014

RSC Adv.

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Decrosslinking of peroxide crosslinked high-density polyethylene (XHDPE) of different degrees of crosslinking by means of an ultrasonic single-screw extruder (SSE) is investigated. Barrel pressure and ultrasonic power consumption during extrusion are recorded. Swelling tests, rheological tests, infrared spectroscopy, thermal analysis and tensile tests are used to elucidate the structure-property relationship of decrosslinked XHDPE. It was found that a more intensive rupture of the crosslinked network occurs in XHDPE of a higher degree of crosslinking. Analysis based on the Horikx function shows that the type of preferential bond breakage during decrosslinking of XHDPE of various degrees of crosslinking is not determined by the bond energy alone but is also influenced by structural characteristics of the network.The activation energy of viscous flow of sols extracted from various decrosslinked XHDPEs supports the analysis based on the Horikx function. The dynamic, thermal and tensile properties of the decrosslinked XHDPE are greatly affected by the type of preferential bond breakage. A significant improvement in the processability and mechanical properties of decrosslinked 2% peroxide cured XHDPE is achieved due to the occurrence of a highly preferential breakage of crosslinks during ultrasonic decrosslinking.

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“…Also, the loss tangent of XHDPE, XLDPE, decrosslinked XHDPE and XLDPE shows a relatively weak dependence on the frequency. Such a behavior is typical for socalled "critical gel" [28][29][30][31][32][33] and "post critical gel" [34]. The post critical gel model fitting of XHDPE, XLDPE, decrosslinked XHDPE and XLDPE is also indicated in Figures 9 to 12 by dotted lines.…”

Section: Dynamic Propertiesmentioning

confidence: 95%

Comparison between decrosslinking of crosslinked high and low density polyethylenes via ultrasonically aided extrusion

Huang

Isayev

2015

Polymer

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Please cite this article as: Huang K, Isayev AI, Comparison between decrosslinking of crosslinked high and low density polyethylenes via ultrasonically aided extrusion, Polymer (2015), AbstractAmong various polymer wastes, management of crosslinked plastics is a major environmental problem requiring a solution. Among various crosslinked plastics, recycling of crosslinked polyethylenes is of a great importance due to the presence of a three-dimensional network. To solve this problem, novel environmentally friendly technologies for decrosslinking of the crosslinked polymers are developed based on ultrasonically assisted single (SSE) and twin screw (TSE) extruders. In particular, decrosslinking of peroxide crosslinked high-density polyethylene (XHDPE) and low-density polyethylene (XLDPE) by means of an ultrasonic SSE and TSE is investigated. Barrel pressure, die pressure and ultrasonic power consumption during extrusion are recorded. Swelling, rheological, thermal analysis and tensile tests are used to elucidate the structure-property relationships of decrosslinked XHDPE and XLDPE. The frequency dependencies of the storage and loss moduli, complex viscosity and tangent loss of XHDPE, XLDPE and their decrosslinked networks are described by the post critical gel model with its parameters correlated with gel fraction and crosslink density. The dynamic, thermal and tensile properties of the decrosslinked XHDPE and XLDPE are greatly affected by the type of preferential bond breakage. It was found that the decrosslinking of XLDPE is more difficult than that of XHDPE. An analysis based on the Horikx function reveals a highly preferential breakage of crosslinks during decrosslinking of XHDPE. In contrast to decrosslinking of XHDPE, the presence of long-chain branching in XLDPE is found to lead to the breakage of its main chains during decrosslinking. An improvement and a reduction in mechanical properties of decrosslinked XHDPE and XLDPE are, respectively, observed in comparison with those of virgin XHDPE and XLDPE. Such differences in behavior are due to the occurrence of a highly preferential breakage of crosslinks in XHDPE and the breakage of main chains in XLDPE during ultrasonic decrosslinking. Graphic AbstractStress-strain curves of HDPE, LDPE, XHDPE and XLDPE (a) and decrosslinked XHDPE (b) and XLDPE (c) by SSE and TSE with and without ultrasonic treatment.

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Enhanced strain hardening in elongational viscosity for HDPE/crosslinked HDPE blend. I. Characteristics of crosslinked HDPE

Cited by 31 publications

References 12 publications

Properties of high‐density polyethylene filled with waste crosslinked foam

Properties of high‐density polyethylene filled with waste crosslinked foam

Ultrasonic decrosslinking of crosslinked high-density polyethylene: effect of degree of crosslinking

Comparison between decrosslinking of crosslinked high and low density polyethylenes via ultrasonically aided extrusion

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