Elastic and yield behaviors of recycled polypropylene-based composites: Experimental and modeling study

Wang, Kui; Bahlouli, Nadia; Addiego, Frédéric; Ahzi, Saı̈d

doi:10.1016/j.compositesb.2016.06.033

Cited by 16 publications

(16 citation statements)

References 48 publications

(106 reference statements)

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“…However, limited research studies have been conducted and published on the effect of recycling activities on the thermo-mechanical properties of PP as a function of temperature. Also, despite the availability of PS recycling technology, recycled polystyrenes' market is characterized by relatively decreasing demand, overcapacity, and underuse due to limited knowledge on the effect of recycling on thermo-mechanical properties [19,[26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, polymers are subjected to physical stresses (mechanical forces, heat, radiation), and chemical changes due to chemical deteriogens (humidity, oxygen, atmospheric pollutants). The conditions cause structural deterioration of the polymeric components [2,27,30]. Also, as a side effect to consider, contamination by residues such as inorganic, organic, or biological residues cause deterioration of the polymers during recycling.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Thermomechanical Properties of Selected Class of Recycled Thermoplastic Materials Based on Their Applications

2019

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Polypropylene and polystyrene are petroleum-based thermoplastics which are commonly used and disposed of in the environment after their service life, leading to environmental degradation. There is a need to recycle polypropylene and polystyrene, but the effect of recycling on thermo-mechanical properties is not well understood. This study aims to determine thermo-mechanical properties of the recycled polypropylene and recycled polystyrene and compare them with corresponding virgin polypropylene and newly produced polystyrene (general purpose polystyrene 1540 and high impact polystyrene 7240). The study was carried out by preparing bar-shaped samples of recycled polypropylene, recycled polystyrene, general purpose polystyrene 1540, and high impact polystyrene 7240 by compression molding using a hot press and thermally characterizing them to determine glass transition temperature and melting temperature using differential scanning calorimetry. The changes in Young’s modulus, tensile strength, hardness, and toughness due to recycling activities were determined at room temperature (24 °C), 40 °C, 60 °C, and 80 °C. The thermo-mechanical properties of recycled polystyrene (PS) were found to be comparable to those of high impact polystyrene (HIPS) 7240. The study revealed that the hardness and toughness for the recycled polymers were higher than those of corresponding virgin polymers. On the other hand, tensile strength and Young’s modulus for the recycled polymers were lower than those of the virgin polymers. Understanding the thermo-mechanical properties of the recycled polymers will contribute to more industrial applications hence increase the rate of recycling, resulting in a reduction in environmental pollution.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of Thermomechanical Properties of Selected Class of Recycled Thermoplastic Materials Based on Their Applications

2019

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“…The additive and multiplicative approaches proposed for hybrid composites are presented in Eqs. 7 and 8 .

\frac{E_{c, add}}{E_{m}} = \frac{E_{PP / G}}{E_{m}} + \frac{E_{PP / Cnt}}{E_{m}} - 1

\frac{E_{c, mul}}{E_{m}} = ((), \frac{E_{italicPP / italicCnt}}{E_{m}}) ((), \frac{E_{italicPP / G}}{E_{m}})

…”

Section: Resultsmentioning

confidence: 99%

“…The additive and multiplicative approaches proposed for hybrid composites are presented in Eqs. 7 and 8 [19,[24][25][26][27].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…The novelty of the current work is that an attempt has been made to capture the synergistic contribution of micro and nano fillers using different micro mechanical theoretical models to evaluate the elastic moduli of the composites. Only very few reports have discussed the combined effect of fillers in matrices using additive and multiplicative two population model approaches for multiscale composites . The effect of varying CNT proportions in PP/GF micro composite for the prediction of modulus via two population model approaches has been analyzed in detail.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical and Thermal Properties Modeling, Sorption Characteristics of Multiscale (Multiwalled Carbon Nanotubes/Glass Fiber) Filler Reinforced Polypropylene Composites

Rasana

Jayanarayanan

Pavithra

et al. 2019

Vinyl Additive Technology

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The present work was aimed to investigate the individual and hybrid reinforcement effect of multiscale fillers [glass fibers (GF)/multiwalled carbon nanotubes (MWCNTs)] in polypropylene (PP) matrix. The MWCNT content in the hybrid composites was varied from 0.5 to 5 wt%, and glass fiber fraction was fixed as 20 wt%. The morphology of nano and hybrid composite revealed reasonable dispersion of MWCNTs and glass fibers in the matrix. At a MWCNT content of 3 wt%, the optimum tensile properties for the hybrid composites were achieved and beyond which it declined due to agglomeration effects as revealed by transmission electron microscopy. A comparative study of the experimental and predicted values of moduli of nano, micro, and hybrid composites using various micromechanical models was conducted. The simultaneous incorporation of MWCNTs and glass fibers in PP restricted the mobility of polymer chains as indicated by the increase in storage modulus and rise in glass transition temperature obtained by dynamic mechanical analysis. The differential scanning calorimetry studies indicated that the inclusion of 2 wt% of MWCNTs increased the crystallinity of PP from 58.2 to 69.1% in hybrid composites. The Avrami and Mo models were used to explore nonisothermal crystallization kinetics, and Mo model was in close agreement with the experimental results. The sorption behavior of the composites revealed that the formation of immobilized regions developed by the simultaneous inclusion of micro and nano fillers delayed the transport of the solvent. J. VINYL ADDIT. TECHNOL., 25:E94–E107, 2019. © 2019 Society of Plastics Engineers

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Improving the mechanical properties of 3D printed recycled polypropylene‐based composites through adjusting printing temperature

Wang

Zhang

Cai

et al. 2023

J of Applied Polymer Sci

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This work aimed at investigating the effects of recycling on the mechanical properties of recycled polypropylene (PP)-based composites and improving the mechanical properties of recycled materials by adjusting the remanufacturing temperature. In this study, 3D printing was selected as the remanufacturing approach and the composites were ground and reextruded up to nine times to simulate mechanical recycling. The gel permeation chromatography results indicated that the recycling led to a reduction in molecular weight, increasing the melt fluidity of the materials. Excessive melt flow of material during printing caused the poor quality of printed parts with macro and micro defects, deteriorating the mechanical properties of the printed specimens. To improve the final quality and mechanical properties of the printed specimens, melt flow during the printing of recycled materials was adjusted by tuning the printing temperature. The results found that the mechanical properties of the recycled PP-based composites were well enhanced by using tuned printing temperature.

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Elastic and yield behaviors of recycled polypropylene-based composites: Experimental and modeling study

Cited by 16 publications

References 48 publications

Analysis of Thermomechanical Properties of Selected Class of Recycled Thermoplastic Materials Based on Their Applications

Analysis of Thermomechanical Properties of Selected Class of Recycled Thermoplastic Materials Based on Their Applications

Mechanical and Thermal Properties Modeling, Sorption Characteristics of Multiscale (Multiwalled Carbon Nanotubes/Glass Fiber) Filler Reinforced Polypropylene Composites

Improving the mechanical properties of 3D printed recycled polypropylene‐based composites through adjusting printing temperature

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