Open Access

ARTICLE

Kahina Iggui^1,2,*, Mustapha Kaci¹, Mohamed Mahlous³, Nicolas Le Moigne⁴, Anne Bergeret⁴
Journal of Renewable Materials, Vol.7, No.9, pp. 807-820, 2019, DOI:10.32604/jrm.2019.06778
Abstract In this paper, the effects of gamma irradiation on Cast poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and PHBV/Cloisite 30B (C30B) (3 wt%) bionanocomposite prepared by melt compounding, were evaluated at various doses, i.e., 5, 15, 20, 50 and 100 kGy at room temperature in air. Changes in molecular weight, morphology and physical properties were investigated. The study showed that the main degradation mechanism occurring in gamma irradiation in both Cast PHBV and C-PHBV/3C30B bionanocomposite is chain scission, responsible for the decrease of molecular weight. Differential scanning calorimetry (DSC) data indicated a regular decrease in crystallization temperature, melting temperature and… More >

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1942

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1182

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2

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ARTICLE

M. Khennache^1,*, A. Mahieu¹, M. Ragoubi¹, S. Taibi¹, C. Poilâne², N. Leblanc¹
Journal of Renewable Materials, Vol.7, No.9, pp. 821-838, 2019, DOI:10.32604/jrm.2019.06772
Abstract In France, the use of flax fibers as reinforcement in composite materials is growing exponentially in the automotive sector, thanks to their good physicochemical properties, environmental reasons, health neutrality and due to the European Council Directives on the reuse, recycling and valorization of car components and materials. The aim of our study is to investigate biochemical, physicochemical, and mechanical properties of technical flax fibers to evaluate the impact of transformation processes (scutching, hackling, and homogenization) on final properties of associated composite materials. Different chemical analysis such as Van Soest (biochemical fraction measurement), FTIR (Fourier Transform More >

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1990

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1284

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2

Open Access

ARTICLE

Wajdi Zouari^1,*, Mustapha Assarar¹, Abderrazak Chilali², Rezak Ayad¹, Hocine Kebir³
Journal of Renewable Materials, Vol.7, No.9, pp. 839-853, 2019, DOI:10.32604/jrm.2019.06773
Abstract This contribution deals with the development of a three-node triangular plane finite element to analyze the transient hygroscopic behavior of 2/2 twill flax fabric-reinforced epoxy composite. Several plates of this material were fabricated using the vacuum infusion process and composite specimens were then cut and aged in tap water at room temperature until saturation. To simplify, a plane modelling of water diffusion in the aged specimens is adopted and Fick’s model is used to describe the water diffusion kinetics. To highlight the heterogeneity of the flax-epoxy samples, the twill flax fabrics waviness is modelled with More >

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2376

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1323

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4

Open Access

ARTICLE

Morgan Chabannes^1,2,*, Frédéric Becquart^1,2, Nor-Edine Abriak^1,2
Journal of Renewable Materials, Vol.7, No.9, pp. 855-863, 2019, DOI:10.32604/jrm.2019.06779
Abstract The return to old building methods by mixing crop by-products with mineral binders is arousing great interest in Europe since about 25 years. The use of these bio-aggregates based materials for the design of building envelopes is a valuable opportunity to deal with increasingly demanding thermal regulations. In addition, the regulatory framework is moving towards reducing the overall car-bon footprint of new buildings. Some traditional and historic buildings are based on timber framing with earth-straw as infill material for instance. Hemp concrete is a bio-based material that can be manually tamped in timber stud walls… More >

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2397

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1555

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ARTICLE

Daniel Scida^1,*, Sébastien Alix¹, Stéphane Buet¹, El Hadi Saidane¹, François Courmont^1,2, Karim Behlouli², Rezak Ayad¹
Journal of Renewable Materials, Vol.7, No.9, pp. 865-875, 2019, DOI:10.32604/jrm.2019.06609
Abstract This work aims at studying the effect of hygrothermal and UV cyclic aging on the tensile properties and esthetic characteristics of non-woven composites. The composite materials were thermo-compressed from non-woven mats made up of PP and flax or kenaf fibers. This works included evaluating the change in color appearance and analyzing the variations in tensile properties and damage mechanisms, depending on the aging time. The presence of the UV protection film on the composite surface showed its effectiveness against aging. From visual observations and measurement of colorimetric parameters, it has been proved effective in the More >

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3053

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1245

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Khouloud Cheour^1,*, Mustapha Assarar¹, Daniel Scida¹, Rezak Ayad¹, Xiaolu Gong²
Journal of Renewable Materials, Vol.7, No.9, pp. 877-889, 2019, DOI:10.32604/jrm.2019.06826
Abstract The aim of this study is to show the interest of the mechanical and dynamical properties of glass-flax hybrid composites. Therefore, various staking sequences of glass-flax hybrid composites were manufactured and tested in free vibrations. The damping coefficients were identified by fitting the experimental responses of free-free bending vibrations. The obtained results show that the staking sequences and the position of flax fiber layers in the hybrid composites changed the properties, so a classification of different stacking sequences was established. In fact, the hybrid laminate made of two glass external layers placed on both sides More >

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2002

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1826

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2

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ARTICLE

Fatma Kharrat¹, Rania Chaari¹, Mohamed Khlif¹, Loic Hilliou², José A. Covas², Mohamed Haboussi^3,*, Hedi Nouri¹, Chedly Bradai¹
Journal of Renewable Materials, Vol.7, No.9, pp. 891-901, 2019, DOI:10.32604/jrm.2019.06827
Abstract Biocomposite films prepared with melt compounding and film blowing have become a new trend in plastic research to deliver more eco-friendly packages. Polylactic acid (PLA) was melt compounded with minimally processed date palm leaf fiber (DPLF) and converted into films by blown film extrusion. The compounding was done in order to enhance the film mechanical properties in one hand, and to decrease the film production cost in the other hand. In this present study, a reference PLA film and films with 1%, 2%, and 5% of DPLF (weight %) were produced with different process parameters.… More >

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2288

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1286

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1

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ARTICLE

Lepeng Wang¹, Hélène Lenormand^1,*, Hafida Zmamou¹, Nathalie Leblanc¹
Journal of Renewable Materials, Vol.7, No.9, pp. 903-913, 2019, DOI:10.32604/jrm.2019.06788
Abstract Plant aggregate-based building materials are a viable solution for reducing greenhouse gas emissions and providing good thermal and acoustic performances. In this study, the investigated lightweight mortars require a hydraulic reaction. Laboratory and on-site empirical observations about plant aggregate-based materials indicate a delay in setting time and a decrease in the mechanical performances of concretes based on plant aggregates. The natural origin of plant-aggregates causes a lot of variability in their properties. Related studies have shown that the incompatibility between plant aggregates and cement is mainly caused by the dissolved and decomposed components of plant… More >

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2020

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1325

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5