Rheological and Thermal Behavior of High-Density Polyethylene (HDPE) at Different Temperatures

Erbetta, Cynthia D’Avila Carvalho; Manoel, Getúlio F.; Oliveira, Ana Paula Lelis Rodrigues de; Silva, Maria Elisa Scarpelli Ribeiro e; Freitas, Roberto F. S.; Sousa, Ricardo Geraldo de

doi:10.4236/msa.2014.513094

Cited by 11 publications

(9 citation statements)

References 11 publications

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“…Frequency sweep rheological measurements were performed between 0.1 and 500 rad/s at 5% strain and at a melt temperature of 160 °C to avoid thermal degradation. 45 We observe increased complex viscosity (η*) with increasing Đ among the samples of each addition rate profile set (Figure S8). This is consistent with previous work which has shown that broadening the MWD of polymer melts enhances shear thinning to drastically lower the viscosity at high frequencies.…”

Section: ■ Results and Discussionmentioning

confidence: 90%

Controlling the Shape of Molecular Weight Distributions in Coordination Polymerization and Its Impact on Physical Properties

et al. 2019

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High-density polyethylene (HDPE) is utilized in a multitude of commercial products worldwide due to its broad spectrum of physical properties and low production costs. Molecular weight and dispersity (Đ) are known to affect the tensile and rheological properties of HDPE, but little is known about the influence of the molecular weight distribution (MWD) shape on these properties. In this work, we investigate this matter through the temporal regulation of initiation in a living coordination−insertion polymerization of ethylene. This method provides precise control over the MWD shape which, in turn, offers a systematic study on the influence of MWD shape on the physical properties of HDPE. Through rheological testing, we observe a difference in complex viscosity and shear thinning with opposite MWD skew. However, tensile testing reveals that the MWD skew does not impact the strain at break, signifying the ability to influence HDPE processing without compromising material strength.

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Section: ■ Results and Discussionmentioning

confidence: 90%

Controlling the Shape of Molecular Weight Distributions in Coordination Polymerization and Its Impact on Physical Properties

et al. 2019

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“…Oxidation was expected to create oxygenated groups in the fiber structure via radical mechanism, in type of R·, RO·, or ROO· groups. However, the inability of the polymer chain to obtain the esterified-like structure of ROO· did not promote the increase of molecular weight (Mw) or any kind of crosslinking; thus, the fibers melted during oxidative thermal stabilization treatment [22].…”

Section: Sulfonation and Crosslinking Mechanismsmentioning

confidence: 99%

“…Heat treatment of the formatted hydrocarbon polymer with polyacetylenic species and sulfonic acid groups in a temperature range from 100 • C to 180 • C results in desulfonation along with crosslinking among the hydrocarbon polymers and the formation of aromatic structures (reaction 4). Furthermore, heat treatment over 600 • C in inert atmosphere results in the formation of a graphite structure [22].…”

Section: Preparation Of Carbon Fibers (Cfs)mentioning

confidence: 99%

Thermal Treatment of Melt-Spun Fibers Based on High Density PolyEthylene and Lignin

Goulis

Konstantopoulos

Kartsonakis

et al. 2017

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Abstract:The purpose of this study was the synthesis of novel low-cost carbon fibers along with the investigation of the optimal parameters of temperature and time for the stabilization of hybrid high-density polyethylene (HDPE) and lignin melt-spun fibers. These fibers were manufactured by physical compounding of HDPE and chemically-modified softwood kraft lignin (SKL) in order to produce green fiber precursors for carbon fiber synthesis. Stabilization tests were performed with respect to thermal treatment (physical method) and sulfonation treatment (chemical method). The results revealed that only chemical methods induce the desired thermal process-ability to the composite fibers in order to manufacture carbon fibers by using a simple method. This investigation shed light on the stabilization techniques of polymeric fibers in the absence of any cyclic groups in terms of environmentally-friendly mass production of carbon fibers using low-cost and green raw materials. This study facilitates incorporation of softwood lignin in homegrown polymeric fibers by a low-cost production process via melt-spinning of composite fibers, which were successfully stabilized using a facile chemical method and carbonized. Additionally, a comprehensive investigation of the thermal behavior of the samples was accomplished, by examining several ways and aspects of fiber thermal treating. The properties of all studied fibers are presented, compared, and discussed.

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“…Although, lignin was on the scope of polymer scientists for years, its implementation into polymer science and engineering is often hindered by its structure, which is highly dependent on the extraction procedure and the type of plant selected [5,6]. On the other hand, nylon is widely used at a galore of everyday applications such as polymeric films, plastic bags and other products [7][8][9]. Several major industries over the world, such as the automobile industry, are constantly searching for materials with desirable and favorable properties in order to enhance their products and be more competitive in a global scale.…”

Section: Introductionmentioning

confidence: 99%

Effect of Lignin and CNTs on the properties of melt-spun polymeric fibers

et al. 2018

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Abstract. The quality of high density polyethylene (HDPE) -lignin spun fibers depends on the spinning method and the chemical modification of the raw material. On the other hand, nylon-type polymers are widely known for their simple experimental synthesis and use. The goal of this study was the fabrication of composites containing lignin, nylon and multi-walled carbon nanotubes (MWCNTs) based fibers with enhanced mechanical properties. Therefore, a nylon-type polymer was synthesized, using diethylenetriamine and sebacoyl chloride, and was conjugated with lignin as well as MWCNTs with the aim of determining the materials' compatibility, differences in chemical behavior as well as their ability to be melt spun and be further processed. The materials were compounded with HDPE and melt spun, producing fibers that were characterized in respect of their morphology, structural, chemical and elemental composition. Finally, the HDPE fibers were used for the production of one dimensional composites inside dumb bell type sacrificial templates with an epoxy resin solution. The composites, which contained fibers enriched with oxidized lignin and MWCNTs, presented higher elastic modulus and ultimate tensile strength than the rest of the composites. This is a novel attempt, presenting an innovation concerning durable fibers with low cost materials and procedures.

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Rheological and Thermal Behavior of High-Density Polyethylene (HDPE) at Different Temperatures

Cited by 11 publications

References 11 publications

Controlling the Shape of Molecular Weight Distributions in Coordination Polymerization and Its Impact on Physical Properties

Controlling the Shape of Molecular Weight Distributions in Coordination Polymerization and Its Impact on Physical Properties

Thermal Treatment of Melt-Spun Fibers Based on High Density PolyEthylene and Lignin

Effect of Lignin and CNTs on the properties of melt-spun polymeric fibers

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