An innovative recycling process to obtain pure polyethylene and polypropylene from household waste

Serranti, Silvia; Luciani, Valentina; Bonifazi, Giuseppe; Hu, Bin; Rem, Peter

doi:10.1016/j.wasman.2014.10.017

Cited by 99 publications

(70 citation statements)

References 18 publications

(17 reference statements)

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“…The assignments of the chemical shifts of the films are shown in Table . The chemical shifts of the protons of the starch‐g‐PCL graft copolymer film are similar to those reported in the literature for the synthesized graft copolymer . This indicates that the graft copolymer maintains its chemical bonds after their plastification.…”

Section: Resultssupporting

confidence: 85%

“…The literature has reported that starch from physiologically immature bananas and catalysts, such as molybdenum oxide and ammonium heptamolybdate, favor the polymerization of CL on starch granules to obtain conversion yields reaching 84% . The conventional polymers generate a negative impact on the environment because most of these polymers are produced in large, industrial‐sized quantities and are poorly degradable; moreover, this graft copolymer is an alternative to the conventional polymers .…”

Section: Introductionmentioning

confidence: 99%

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Clusters of starch‐g‐PCL and their effect on the physicochemical properties of films

et al. 2017

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Starch-g-PCL films were prepared using the casting method and were characterized by different instrumental techniques and physicochemical properties. Nuclear magnetic resonance and Fourier transform infrared spectroscopy led to the proposal of a chemical structure for the films. The scanning electron microscopy (SEM) images of the films showed the formation of clusters of the graft copolymer starch-g-PCL. The effects of these clusters on the crystallinity (X-ray powder diffraction) revealed that the crystalline zones of the films increased by 46% and the elongation percentage increased by up to 50%. Also, the chemical degradation (aqueous hydrolysis) and the soil degradation of these films were 1.9 and 2.6 times faster than the films of starch alone. However, the thermal degradation temperature of the films decreased by more than 15°C, the moisture content decreased to 6.5%, and the water vapor permeation values increased in the films that contained starch-g-PCL. These results were accentuated with the increase in the amount of starch-g-PCL clusters.

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Section: Resultssupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Clusters of starch‐g‐PCL and their effect on the physicochemical properties of films

et al. 2017

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“…However, by using this simple and easy method combined with froth-flotation the plastics can be effectively separated [77,78]. Additionally, by using a magnetic liquid that contains iron oxide the multiple polymer fractions can be separated based on the varied components densities using the magnetic density separation method [79,80].…”

Section: Methods Of Identificationmentioning

confidence: 99%

Waste Electrical and Electronic Equipment: A Review on the Identification Methods for Polymeric Materials

et al. 2019

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Considering that the large quantity of waste electrical and electronic equipment plastics generated annually causes increasing environmental concerns for their recycling and also for preserving of raw material resources, decreasing of energy consumption, or saving the virgin materials used, the present challenge is considered to be the recovery of individual polymers from waste electrical and electronic equipment. This study aims to provide an update of the main identification methods of waste electrical and electronic equipment such as spectroscopic fingerprinting, thermal study, and sample techniques (like identification code and burning test), and the characteristic values in the case of the different analyses of the polymers commonly used in electrical and electronic equipment. Additionally, the quality of the identification is very important, as, depending on this, new materials with suitable properties can be obtained to be used in different industrial applications. The latest research in the field demonstrated that a complete characterization of individual WEEE (Waste Electric and Electronic Equipment) components is important to obtain information on the chemical and physical properties compared to the original polymers and their compounds. The future directions are heading towards reducing the costs by recycling single polymer plastic waste fractions that can replace virgin plastic at a ratio of almost 1:1.

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“…This constitutes a major environmental problem with a variety of global impacts. Furthermore, the majority of these plastics are obtained from non‐renewable, petroleum‐based sources; during plastic synthesis, pollutants are directly discharged into the environment . For these reasons, there is a great interest in producing biodegradable plastics based on natural polymers, such as starch.…”

Section: Introductionmentioning

confidence: 99%

The effect of ethylene glycol on starch‐g‐PCL graft copolymer synthesis

et al. 2016

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The synthesis of the graft copolymer starch‐g‐PCL was carried out in a single phase, using molybdenum oxide as a catalyst, at a temperature of 150°C over a period of 24 h. Infrared spectroscopy and nuclear magnetic resonance analyses indicated that the graft copolymer was successfully synthesized, obtaining an 84% conversion yield. The introduction of ethylene glycol to the reaction influences the copolymer synthesis, affecting conversion yields and the physicochemical properties of the resultant copolymer. X‐ray diffraction analysis indicates that the copolymer crystallinity decreases as ethylene glycol concentration increases. An investigation of the thermal properties of the graft copolymer suggested that the decomposition temperature of the copolymer, compared to that of the homopolymer, decreases with exposure to ethylene glycol. Scanning electron microscopy revealed the formation of clusters between the starch granules and the grafted copolymer due to the interaction of the hydroxyl groups of the starch and PCL.

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An innovative recycling process to obtain pure polyethylene and polypropylene from household waste

Cited by 99 publications

References 18 publications

Clusters of starch‐g‐PCL and their effect on the physicochemical properties of films

Clusters of starch‐g‐PCL and their effect on the physicochemical properties of films

Waste Electrical and Electronic Equipment: A Review on the Identification Methods for Polymeric Materials

The effect of ethylene glycol on starch‐g‐PCL graft copolymer synthesis

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