Time–temperature and stress dependent behaviors of composites made from recycled polypropylene and rubberwood flour

Homkhiew, Chatree; Ratanawilai, Thanate; Thongruang, Wiriya

doi:10.1016/j.conbuildmat.2014.05.048

Cited by 22 publications

(10 citation statements)

References 36 publications

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“…Within the linear viscoelastic range of the materials, simple rheological models are appropriate. Among these models for WPCs, Burger’s model has often been used [ 18 , 28 , 29 ]. This model includes four elements that are combined with the Maxwell and Kelvin-Voigt models to quantitatively show the relationship between the morphology of the prepared materials and their creep behavior.…”

Section: Methodsmentioning

confidence: 99%

Effects of Heat-Treated Wood Particles on the Physico-Mechanical Properties and Extended Creep Behavior of Wood/Recycled-HDPE Composites Using the Time–Temperature Superposition Principle

Yang

Chien

et al. 2017

Materials

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This study investigated the effectiveness of heat-treated wood particles for improving the physico-mechanical properties and creep performance of wood/recycled-HDPE composites. The results reveal that the composites with heat-treated wood particles had significantly decreased moisture content, water absorption, and thickness swelling, while no improvements of the flexural properties or the wood screw holding strength were observed, except for the internal bond strength. Additionally, creep tests were conducted at a series of elevated temperatures using the time–temperature superposition principle (TTSP), and the TTSP-predicted creep compliance curves fit well with the experimental data. The creep resistance values of composites with heat-treated wood particles were greater than those having untreated wood particles due to the hydrophobic character of the treated wood particles and improved interfacial compatibility between the wood particles and polymer matrix. At a reference temperature of 20 °C, the improvement of creep resistance (ICR) of composites with heat-treated wood particles reached approximately 30% over a 30-year period, and it increased significantly with increasing reference temperature.

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Section: Methodsmentioning

confidence: 99%

Effects of Heat-Treated Wood Particles on the Physico-Mechanical Properties and Extended Creep Behavior of Wood/Recycled-HDPE Composites Using the Time–Temperature Superposition Principle

Yang

Chien

et al. 2017

Materials

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“…The high mechanical properties are also directly related to their crystallinity [27,57]. Recycled PP had improved hardness compared to that of virgin PP by 11.7-26.5% because recycled PP could have less flexibility matrix than virgin PP as explained by Homkhiew et al [58]. The results were contrary to the explanations given by Ratanawilai et al [59] that thermal degradation due to chain scission of virgin PP contributes cracks and hence lowers the hardness of recycled PP.…”

Section: Hardnessmentioning

confidence: 95%

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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“…As reported in the literature, the fatigue behaviors of polymers and polymer-matrix composites have been evaluated with respect to the effects of loading modes, time, temperature, mean stress, stress concentration, frequency, aging, anisotropy, and environmental effects (Mortazavian and Fatemi 2015a;Mortazavian and Fatemi 2015b;Shojaei and Wedgewood 2017). The creep of the composites increased as time, temperature, and stress increased (Homkhiew et al 2014), and high correlations between fatigue strength and tensile strength were obtained. In one study, the creep resistance values of composites with heat-treated wood particles were greater than those with untreated wood particles due to the hydrophobic quality of the treated wood particles and the improved interfacial compatibility between the wood particles and polymer matrix (Yang et al 2017).…”

Section: Introductionmentioning

confidence: 88%

Interaction of Low Cycle Fatigue and Creep in Biomass-filled Plastic Composites

Guo

Zhu

2018

BioResources

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Most research on biomass-filled plastic composites (BFPCs) mainly focuses on their formulation and physical/mechanical properties, but studies on the connection performance of BFPCs are very rare. However, such performance is vital in the quality assessment of BFPCs products and plays an important role in improving product quality and promoting its application in the field of architecture and furniture. Therefore, the behavior of L-type BFPCs structure under the interaction of fatigue-creep was investigated. Results suggested that the fatigue-creep curve is a typically three-region curve at 80% and 60% failure load, and only first two stages at 40% failure load. But the damage caused by fatigue-creep interaction was not a simple superposition. Fatigue damage dominated when the holding time was short, and creep damage occupied a dominant position gradually when the holding time was longer. In addition, the lifespan of the BFPC component increased initially and then decreased as holding time increased. The component joint exhibited the least integrated damage when the holding time was 60 s and the lifespan was longer.

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Time–temperature and stress dependent behaviors of composites made from recycled polypropylene and rubberwood flour

Cited by 22 publications

References 36 publications

Effects of Heat-Treated Wood Particles on the Physico-Mechanical Properties and Extended Creep Behavior of Wood/Recycled-HDPE Composites Using the Time–Temperature Superposition Principle

Effects of Heat-Treated Wood Particles on the Physico-Mechanical Properties and Extended Creep Behavior of Wood/Recycled-HDPE Composites Using the Time–Temperature Superposition Principle

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

Interaction of Low Cycle Fatigue and Creep in Biomass-filled Plastic Composites

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