Rheological and thermorheological assessment of polyethylene in multiple extrusion process

Dordinejad, Abdol Kamal; Sharif, Farhad; Ebrahimi, Morteza; Rashedi, Reza

doi:10.1016/j.tca.2018.08.010

Cited by 25 publications

(29 citation statements)

References 47 publications

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“…The resulting plots of complex viscosity and storage modulus versus frequency are presented in Figure (c,d), respectively. The greater difference in the sample response in these two cycles particularly in the terminal zone is an indication of higher thermal degradation of the sample . It is obvious that there is no significant difference in response of the samples in the two cycles for the neat blend samples and even for nanocomposite samples containing 1 wt % of xGnP.…”

Section: Resultsmentioning

confidence: 99%

Development of degradable poly(ethylene terephthalate)‐based nanocomposites with the aid of polylactic acid and graphenic materials: Thermal, thermo‐oxidative and hydrolytic degradation characteristics

Jafari

Khajavi

Goodarzi

et al. 2019

J of Applied Polymer Sci

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Poly(ethylene terephthalate)/poly(lactic acid) (PET/PLA) blends with composition of 90/10 and 75/25 (wt %/wt %) along with two types of graphenic materials, namely graphene oxide (GO) and exfoliated graphite (xGnP), were prepared through one‐step melt mixing process. The Thermal, thermo‐oxidative, and hydrolytic degradation characteristics of the developed degradable PET‐based nanocomposites were investigated. Thermal degradation studies by thermogravimetry analysis and melt rheological analysis in N2 atmosphere, revealed that unlike xGnP, the addition of GO to the blends reduced their thermal stability leading to reduction of viscosity and elasticity of the blends. The behavior was attributed to the role of GO in enhancing the chain scission reactions. In the air atmosphere, the barrier properties of the graphenic materials prevailed. Compared to xGnP, the relatively well‐dispersed GO showed better barrier against oxygen and increased the thermo‐oxidative stability of the blends. Investigation of the hydrocatalytic degradation of developed systems, at different pH of 2 and 4, over a period of 40 days at 37 °C, showed that the amount of weight loss of the GO‐containing nanocomposite systems was higher than that of xGnP. The overall results of thermal, thermo‐oxidative, and hydrocatalytic degradation studies confirmed the prominent role of GO in the development of degradable PET‐based products. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48466.

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Section: Resultsmentioning

confidence: 99%

Development of degradable poly(ethylene terephthalate)‐based nanocomposites with the aid of polylactic acid and graphenic materials: Thermal, thermo‐oxidative and hydrolytic degradation characteristics

Jafari

Khajavi

Goodarzi

et al. 2019

J of Applied Polymer Sci

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“…Increases in LDPE molecular weights during recycling is observed using rheology, thermo‐rheology, GPC and FT‐IR studies (Figure 9). [ 120,130,131 ] While degradation mechanisms that increase molecular weight predominate during LDPE reprocessing, an underlying competition between chain scission and chain branching remains. As LDPE is extruded, it shows initial chain cleavage followed by recombination and chain branching.…”

Section: Mechanical Recycling Of Polyolefinsmentioning

confidence: 99%

Mechanical Recycling of Packaging Plastics: A Review

Schyns

Shaver

2020

Macromol. Rapid Commun.

796

692

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The current global plastics economy is highly linear, with the exceptional performance and low carbon footprint of polymeric materials at odds with dramatic increases in plastic waste. Transitioning to a circular economy that retains plastic in its highest value condition is essential to reduce environmental impacts, promoting reduction, reuse, and recycling. Mechanical recycling is an essential tool in an environmentally and economically sustainable economy of plastics, but current mechanical recycling processes are limited by cost, degradation of mechanical properties, and inconsistent quality products. This review covers the current methods and challenges for the mechanical recycling of the five main packaging plastics: poly(ethylene terephthalate), polyethylene, polypropylene, polystyrene, and poly(vinyl chloride) through the lens of a circular economy. Their reprocessing induced degradation mechanisms are introduced and strategies to improve their recycling are discussed. Additionally, this review briefly examines approaches to improve polymer blending in mixed plastic waste streams and applications of lower quality recyclate.

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“…Mechanizm degradacji termicznej PE, polimeru stosowanego powszechnie i produkowanego na wielką skalę, opisano wiele lat temu, jednak w literaturze naukowej wciąż pojawiają się prace dotyczące nowych aspektów jego degradacji termicznej, np. degradacji termokatalitycznej [42], problemów ekologicznych [43], wpływu na proces termooksydacji zawartości grup nienasyconych [44], recyklingu [39,45], efektu prodegradantów i antyoksydantów [46], wpływu stabilizatorów i warunków przetwórstwa [47].…”

Section: Mechanizm Degradacji Termicznej Tworzyw Polimerowych Na Przyunclassified

Advances in studies of thermal degradation of polymeric materials Part I. Literature studies

et al. 2019

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Przedstawiono bieżące kierunki badań stabilności termicznej polimerów, ze szczególnym uwzględnieniem nowatorskich układów polimerowych: kompozytów i nanokompozytów, polimerów biodegradowalnych, biocydowych i do zastosowań specjalnych. Opisano ogólny mechanizm degradacji termicznej zachodzącej podczas przetwórstwa i podstawowe aspekty kinetyczne tego procesu. Omówiono przykłady badań właściwości termicznych wybranych tworzyw na bazie poliuretanów, żywic epoksydowych, kopolimerów kwasu akrylowego i poliestrów.

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Rheological and thermorheological assessment of polyethylene in multiple extrusion process

Cited by 25 publications

References 47 publications

Development of degradable poly(ethylene terephthalate)‐based nanocomposites with the aid of polylactic acid and graphenic materials: Thermal, thermo‐oxidative and hydrolytic degradation characteristics

Development of degradable poly(ethylene terephthalate)‐based nanocomposites with the aid of polylactic acid and graphenic materials: Thermal, thermo‐oxidative and hydrolytic degradation characteristics

Mechanical Recycling of Packaging Plastics: A Review

Advances in studies of thermal degradation of polymeric materials Part I. Literature studies

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