High-density polyethylene crystals with double melting peaks induced by ultra-high-molecular-weight polyethylene fibre

Miao, Weijun; Zhu, Hao; Duan, Tianchen; Chen, Hongbing; Wu, Feng; Jiang, Libin; Wang, Zongbao

doi:10.1098/rsos.180394

Cited by 23 publications

(14 citation statements)

References 41 publications

(39 reference statements)

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“…Table 1 shows the core results evaluated from the DSC tests, composing the deviations obtained from different melting cycles. The degree of crystallinity was estimated by considering the heat of fusion of a perfect polyethylene crystal (293 J/g) [ 29 ]. The extent of composite crystallinities was much preserved for all the recycling steps, particularly having the least deviation for recycling the FA1/HDPE composite samples.…”

Section: Resultsmentioning

confidence: 99%

Effect of Filler Particle Size on the Recyclability of Fly Ash Filled HDPE Composites

Alghamdi

2021

Polymers

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Fly ash polymer composites are innovative high-performance materials that reduce the environmental worries and disposal complications of heavy industry produced fly ash. This study developed and characterized such composites of high-density polyethylene (HDPE) matrices and found that the use of small (50–90 µm) particles of fly ash could give rise to the tensile modulus (~95%) and tensile strength (~7%) of their reinforced composites when compared to neat HDPE materials. While these results themselves convey a strong message of how fly ash can be effectively utilized, this was not the key aim of the current study. The study was extended to examine the effect of fly ash particle size on the recyclability of relevant HDPE composites. The extrusion-based multiple recycling of composites gave slightly lower mechanical properties, primarily due to filler/matrix delamination when large fly ash particles were used. Compared to freshly made fly ash-filled HDPE composites, although using small (50–90 µm) fly ash particles reduced the tensile modulus and tensile strength of recycled composites, the values were still far above those from neat HDPE materials. This novel insight directs the effective utilization of fly ash and provides long-term sustainable and economical solutions for their practical applicability.

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Section: Resultsmentioning

confidence: 99%

Effect of Filler Particle Size on the Recyclability of Fly Ash Filled HDPE Composites

Alghamdi

2021

Polymers

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“…However, HDPE has melting points that usually range from 120°C to 150°C [6], and its crystallization temperature is 100°C. In addition, the most appropriate crystallization temperature for HDPE crystals that are moderately grown on fibers is 100°C, which is the temperature at which lamellae with the maximum size and uniformity form [7]. Thus, the temperature for washing was regulated to be below the melting point of HDPE.…”

Section: Resultsmentioning

confidence: 99%

Deodorizing Methods for Recycled High-density Polyethylene Plastic Wastes

Dany¹,

Dhong²,

Jiata³

et al. 2021

Mater. Plast.

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The recycling of high-density polyethylene plastic (HDPE) plays a crucial role in sustainable development. However, obstacles to the use of recycled HDPE remain because of the material and processing properties and odors of recycled HDPE. The odor of recycled detergent bottle plastic leads to rejection by most detergent manufacturers. Recently, some recycling enterprises have adapted recycling with odor reduction processes involving the use of solvents, antimicrobial additives, and odor extraction units in feeders and extruders. However, these processes may affect the quality and cost of recycled plastic. Most small and medium businesses (SMBs) may not favor these effects due to their limited models and resources. In addition, most SMBs are unwilling to replace their current recycling operation units. Hence, this study aimed to find alternative and economical ways for odor reduction in the recycling process. A modification of the recycling process was introduced in the pretreatment of plastic flakes before entry into the feeder of an extrusion unit. The effect of selected washing temperatures, i.e., 65℃, 75℃, 85℃, and 95℃, on the removal of odor from recycled HDPE was further studied. The addition of sodium bicarbonate, calcium carbonate, and citric acid into a heated water bath enhanced the deodorizing effect. The relationship of these three chemicals with the deodorization of HDPE plastics was investigated through sensory evaluation. Lastly, the potential of the deodorized recycled HDPE for resin pellet production and commercialization were investigated.

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“…In some cases, indeed, fillers may induce the crystallization of polymorphs, which usually do not form in the neat matrix crystallized under the same conditions, causing the appearance of multiple melting. Miao et al prepared composites of high-density polyethylene (HDPE) with ultra-high molecular weight polyethylene (UHMWPE) fibers by solution crystallization [ 84 ]. They ascribed the high temperature of double melting peak of the composites to the transcrystalline HDPE grown close to the surface of fibers and the low temperature peak to the fusion of the bulk HDPE.…”

Section: Effect Of Thermal Properties Of Polymer Composites On Crystallization and Meltingmentioning

confidence: 99%

Impact of Thermal Properties on Crystalline Structure, Polymorphism and Morphology of Polymer Matrices in Composites

Raimo

2021

Materials

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Morphological analysis at different levels is fundamental to understand properties of materials, as these latter are dictated not only by the chemical composition but also by the shape. Solid structures arise from a balance between thermodynamic and kinetic factors, which, especially for polymer composites, depend also on interactions amongst components. In particular, morphology is strongly affected by the heat transfer pattern during crystallization and by the difference in thermal behavior between polymer matrix and filler. Polymers show a spherulitic structure, arising from the start of crystallization in several points of the liquid phase. Within a general rounded shape, spherulites show variability in growth patterns, morphology, and geometry of boundaries. The appearance and the number of spherulites, as well as their growth mechanism, may vary not only in dependence of the chemical composition and the crystalline structures but also, for a same polymer, in consequence of experimental conditions and incorporation of fillers. This article reviews the crystallization process of polymer matrices in the framework of crystal growth and heat transport theories, and explains microstructural differences between composites and neat matrices on the basis of the differences in thermal capacity and conductivity between polymers and additives.

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High-density polyethylene crystals with double melting peaks induced by ultra-high-molecular-weight polyethylene fibre

Cited by 23 publications

References 41 publications

Effect of Filler Particle Size on the Recyclability of Fly Ash Filled HDPE Composites

Effect of Filler Particle Size on the Recyclability of Fly Ash Filled HDPE Composites

Deodorizing Methods for Recycled High-density Polyethylene Plastic Wastes

Impact of Thermal Properties on Crystalline Structure, Polymorphism and Morphology of Polymer Matrices in Composites

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