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Sunday, November 1, 2020 | History

2 edition of Crosslinking of low-density polyethylene found in the catalog.

Crosslinking of low-density polyethylene

G. Leon

Crosslinking of low-density polyethylene

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  • 29 Currently reading

Published by UMIST in Manchester .
Written in English


Edition Notes

StatementG. Leon ; supervised by G.L.A. Sims.
ContributionsSims, G. L. A., Materials Science Centre.
ID Numbers
Open LibraryOL16723815M

Purchase The Effect of Radiation on Properties of Polymers - 1st Edition. Print Book & E-Book. ISBN , Low-density polyethylene (LDPE) is the most popular used thermoplastic polymer in the world, with a wide range of applications, particularly in flexible packaging. According to the Global Business Intelligence Research, the European LDPE demand in was close to 10 million Metric Tons. LDPE is usually produced by high-pressure radical.


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Crosslinking of low-density polyethylene by G. Leon Download PDF EPUB FB2

Conventional crosslinking of low density polyethylene (LDPE) was carried out using dicumyl peroxide (DCP) as crosslinking agent. DCP in various concentrations was mixed with LDPE chips in an extruder at – °C.

Monofilaments were drawn on a laboratory drawing machine at °C. Semantic Scholar extracted view of "Crosslinked polyethylene" by Siraj M. Tamboli et al. Crosslinking and Ageing Of Ethylene-vinyl Silane Copolymers. CROSS-LINKED LOW DENSITY POLYETHYLENE MECHANICAL PROPERTIES AFTER TEMPERATURE LOAD.

Crosslinked blends of low density polyethylene/isotactic polypropene (LDPE/iPP) were studied over the whole composition range. The degree of crosslinking was determined from the gel content and the degree of swelling. In the presence of a coagent an efficient crosslinking of polypropene can be observed in blends whereas in the absence of the Cited by: Request PDF | Reversible crosslinked low density polyethylenes: structure and thermal properties | In the present study, low density polyethylene (LDPE) has been crosslinked at °C with three.

We report a new strategy for the crosslinking of low density polyethylene (LDPE) by using a small amount of functional nanostructured hybrid agent, octavinyl polyhedral oligomeric silsesquioxane (OVPOSS), as the crosslinker, which dramatically decreases the amount of dicumyl peroxide (DCP) and thus avoids the chain scission, scorch, and production of small pores in the conventional peroxide.

The most widely used material for high‐voltage power cable insulation – low‐density polyethylene (LDPE) – is usually crosslinked with peroxides, a process that releases unwanted by‐products.

Hence, by‐product‐free crosslinking concepts that mitigate the associated increase in electrical conductivity are in high demand. Silane-induced crosslinking process [14].

(1) The crosslinking reactions of silane-grafted polyethylene through the hydrolysis of silyl trimethoxy groups with water. Cross-linked polyethylene (XLPE) is a thermosetting resin with three types of cross-linking: peroxide cross-linking, radiation cross-linking, and silane cross-linking.

The polymer can be effectively recycled if only the cross-linking points are decomposed. From peroxide cross-linked polyethylene, the cross-links are selectively removed by using supercritical water without severe decomposition.

Polyethylene Chemical Compatibility Guide Page 1 of 5 Chemical Compatibility Guide For Polyethylene Items This Chemical Compatibility Guide is offered for informational purposes only and was developed from information sources other than SpillTech. The information from such third party sources is believed to be reliable and accurate; however.

Low-density polyethylene (LDPE) is a thermoplastic made from the monomer was the first grade of polyethylene, produced in by Imperial Chemical Industries (ICI) using a high pressure process via free radical polymerization. Its manufacture employs the same method today.

The EPA estimates % of LDPE (recycling number 4) is recycled in the United States. The crosslinking density depends on the functionality and concentration of the crosslinking agent and the nature of the catalyst.

Peroxides. Crosslinking at higher temperatures in the range – °C is achieved by the addition of peroxides. Suitable formulations contain a small amount of vinyl groups. Hydrosilylation Crosslinking.

Effects of polyethylene molecular structure on peroxide crosslinking of low density polyethylene. Bremner. Guelph‐Waterloo Centre for Graduate Work in Chemistry, Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1.

Search for more papers by this author. The crosslinking leads to an increase in the viscosity of the polymer melt, increased tensile strength, improvement of creep properties and an increase in the resistance to environmental stress cracking.

The most studies on the PE were on the low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE). LAKE CHARLES, La., Nov. 16, /PRNewswire/ -- Sasol today announced our LDPE unit reached beneficial operation on 15 November The LDPE unit is the seventh and final Lake Charles Chemicals.

Peroxide crosslinking (PE-Xa): The crosslinking of polyethylene using peroxides (e. dicumyl peroxide or di-tert-butyl peroxide) is still of major importance.

In the so-called Engel process, a mixture of HDPE and 2% [5] peroxide is at first mixed at low temperatures in an extruder and then crosslinked at high temperatures (between °C. Low density polyethylene (LDPE, number averaged molecular weight M n = kg/mol, weight averaged molecular weight M w = kg/mol, density g/cm 3 and melting flow index g/10 min at kg and °C) was produced by Yanshan Co.

Sinopec, China. Dicumyl peroxide (DCP) as crosslinking agent and n-otadecyl-β-(4-hydroxy-3,5-di. been employed, such as blending [], filling [6, 7, 9] and crosslinking []. A blend of syndiotactic polypropylene (PP) and low-density polyethylene (LDPE) was extruded by Park [3] using isobutane as the blowing agent.

It was reported that the foam product was flexible and dimensionally stable, which. (). Preparation of Silane-Grafted and Moisture Cross-Linked Low Density Polyethylene: Part I: Factors Affecting Performance of Grafting and Cross-Linking.

Polymer-Plastics Technology and Engineering: Vol. 45, No. 8, pp. Abstract. The effect of molecular structure of polyethylene (PE) [low density PE (LDPE), linear LDPE and high density PE] and silane/peroxide concentration on the grafting level and gel content in silane crosslinking process has been studied.

Among different polyethylene cross-linking methods, such as peroxide, irradiation, and silane cross-linking, silane-based methods are the most suitable methods for producing cable insulation and hot water pipe materials due to process simplicity and superior properties of its product.

Taking shape: Polyethylene aerogels with low density and excellent mechanical resilience were obtained by combining and maximizing physical crosslinking, by crystallization, and chemical crosslinking. Free Online Library: Molecular Structural Evolution in Crosslinking Low Density Polyethylene-Trimethylolpropane Trimethacrylate Systems.

by "Polymer Engineering and Science"; Engineering and manufacturing Science and technology, general Gelation Analysis Molecular structure Monomers Monte Carlo method Usage Monte Carlo methods Polymers Research. Dicumyl peroxide (DCP) is the most commonly used peroxide crosslinking agent for polyethylene (PE) in high voltage power cables.

The DCP reactions in the PE matrix lead to the formation of a range of byproducts, some of which remain in the final crosslinked polyethylene (XLPE) product and may have adverse effects on the cable function and its long-term properties. A key initiating step in atherosclerosis is the accumulation and retention of apolipoprotein B complexing lipoproteins within the artery walls.

In this work, we address this exact initiating mechanism of atherosclerosis, which results from the oxidation of low-density lipoproteins (oxLDL) using therapeutic nanogels. We present the development of biocompatible polyethylene glycol (PEG) cross.

Principles of crosslinking Three classes of methods have been used in crosslink-ing polymers. One involves ionizing radiation (&radi-ation-induced crosslinking’).

A second utilizes a suitable free-radical-generating chemical, FRGC (&chemical-in-duced crosslinking’). The third involves grafting a suit-able silane compound onto the polymer. The authors used a mixture of crosslinked LLDPE (linear low-density polyethylene) and LDPE with a gel content between 75 and 80%.

The mixture was pulverized into fine powder and used as filler. They concluded that the addition of waste foam as a filler had an effect similar to crosslinking. The efficiency of photochemical crosslinking of low-density polyethylene (PE) films by molecules containing one or two acetophenone groups and their precursors have been correlated with the relative rates of carbonyl group depletion under equivalent irradiation acetophenone derivatives are found to be equally or more efficient than benzophenone as crosslinkers of PE.

I need to prepare a polyethylene glycol hydrogel, but have only limited supply to chemicals, so is there any crosslinking agent (except citric acid) that I may have access to and is able to.

In order to clarify this point additive-free noncrosslinked low-density polyethylene, additive-free crosslinked polyethylene, and degassed crosslinked polyethylene were soaked in the crosslinking byproducts and the space charge distribution was measured after DC voltage application.

Samples tested are divided into two categories. They form bridges between polymer chains to be cross-linked. The aim of this study is to investigate the synergistic effects between POSS and coagent on the physical and shape memory properties of cross-linked linear low-density polyethylene (LLDPE).

The radiation crosslinking of low density polyethylene (LDPE) and high density polyethylene (HDPE) irradiated with 5 and 10 MeV electron beams at dose range of 50 up to kGy is investigated. and one low density, can be melt blended to achieve the density required.

VERY LOW DENSITY POLYETHYLENE Very low density polyethylenes, as the name implies, exhibit densities less than g/cc. These materials are manufactured at moderate pressures using heterogeneous catalysts and comonomers of propylene, butene, hexene or octene. The first industrially practical polyethylene synthesis (diazomethane is a notoriously unstable substance that is generally avoided in industrial application) was again accidentally discovered in by Eric Fawcett and Reginald Gibson at the Imperial Chemical Industries (ICI) works in Northwich, England.

Upon applying extremely high pressure (several hundred atmospheres) to a mixture of. In this study, Low Density Polyethylene (LDPE) and Thermoplastic Starch (TPS) reinforced with different amounts of Starch Nanocrystals (SNCs) with and without Dicumyl Peroxide (DCP) were blended in an internal mixer.

The XRD results showed that crystallinity decreases with increasing SNC content with and without DCP. Tensile test results showed that elongation at breaking, tensile strength. The incorporation of graphene nanoplatelets (GnPs) within a polymer matrix can play an important role in the physical properties and the functionality of the composite material.

Composites consisting of low-density polyethylene (LDPE) and GnPs of different concentrations were developed by mixing GnPs with a molten form of the polymeric matrix.

The effect of the GnPs content on the. 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).

White and coworkers also found that adding the vinyl comonomer leads to a higher GD of MAH and less crosslinking of high-density polyethylene (HDPE) at the same time (). Machado et al.

(17), (18) studied the effect of PE structure on grafting reaction, and found that the side reactions could be suppressed by adjusting the ratio of ethene.

In the present work, we have developed a new food wrap method by cross-linking cinnamaldehyde on low-density polyethylene (Cin-C-LDPE) using novel photocrosslinker technology. The cinnamaldehyde showed potent antimicrobial activity (mg/mL of MIC).

polyethylene and linear low-density polyethylene in that it pos-sesses both long- and short-chain branches along the polymer chain. This author stated that, traditionally, low-density polyethy-lene has been described as homopolymer products having a density.

The most advanced power cable technology uses crosslinked polyethylene (XLPE) insulation, which is produced by peroxide crosslinking of low-density polyethylene (LDPE). Peroxide crosslinking gives rise to hazardous byproducts that compromise the initially excellent purity and cleanliness of LDPE, and hence increase the electrical conductivity.

Goodwrappers PVT Linear Low Density Polyethylene Clear Cast Hand Stretch Wrap On a 3" ID Core, ' Length x 18" Width x 60 Gauge Thick (Case of 4) out of 5 .Twenty plies of low density polyethylene (LDPE) were stacked and irradiated with kGy of 5 MeV electron beam. The plies were analyzed by Differential Scanning Calorimetry (DSC) and Dynamic Mechanical Analysis (DMA) for crosslink density using melting point depression and equilibrium storage modulus respectively.Simultaneous Cross-Linking and Cross-Polymerization of Enzyme Responsive Polyethylene Glycol Nanogels in Confined Aqueous Droplets for Reduction of Low-Density Lipoprotein Oxidation Biomacromolecules.