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  • Open Access


    Peroxide Treatment of Soy Protein Fibers Followed by Grafting of Poly(methyl acrylate) and Copolymers

    Pushpa Bhardwaj1, Susheel Kalia2,3,*, Amit Kumar1, Hemant Mittal4

    Journal of Renewable Materials, Vol.1, No.4, pp. 302-310, 2013, DOI:10.7569/JRM.2013.634123

    Abstract The objective of the present study is to elucidate the effect of peroxide treatment and graft copolymerization on water absorption behavior of soy protein fi bers in order to make them suitable as a reinforcing material. Grafting of poly(methyl acrylate) and copolymers was successfully carried out on peroxide-treated soy protein fi bers. Different reaction parameters were optimized in order to get maximum percentage grafting. The grafted fi bers were evaluated for water absorption behavior in deionized water. Maximum grafting has been found at 0.219 mol/l of methyl acrylate, 0.0096:0.145 mol/l of FAS:H2O2 , 323 K, and 90minutes. Graft copolymerization results… More >

  • Open Access


    Tensile Strength and Water Absorption Behavior of Recycled Jute-Epoxy Composites

    Sihan Wang, Reza Masoodi*, Janet Brady, Brian R. George

    Journal of Renewable Materials, Vol.1, No.4, pp. 279-288, 2013, DOI:10.7569/JRM.2013.634122

    Abstract Recycled natural fi bers and biopolymers with sustainable, eco-friendly, and biodegradable properties are receiving increased attention. The moisture absorption and swelling of natural fi ber composites adversely infl uence their mechanical properties and applications. In this research, bio-based epoxy polymers that are reinforced with recycled woven jute fabrics were subjected to water immersion tests in order to study the effect of water absorption on their mechanical and geometrical properties. For comparison, petroleum-based epoxy polymers that are reinforced with new woven jute fabrics were also subjected to the same tests. The effect of fi ber percentage on water absorption, thickness swelling,… More >

  • Open Access


    Degradation Behaviour of Natural Fibre Reinforced Starch-Based Composites under Different Environmental Conditions

    Rosana Moriana1,2,*, Emma Strömberg1, Amparo Ribes2, Sigbritt Karlsson1,*

    Journal of Renewable Materials, Vol.2, No.2, pp. 145-156, 2014, DOI:10.7569/JRM.2014.634103

    Abstract The purpose of this work was to study the effect of hydrothermal, biological and photo degradation on natural fi bres reinforced biodegradable starch-based (Mater-BiKE) composites to characterize the structural changes occurring under exposure to different environments. The composites water-uptake rate was hindered by the interfacial interactions between matrix and fi bres. Thermal, structural and morphological analysis provided useful information about the irreversible changes in the properties of the composites caused by degradation in soil and photodegradation, and their synergetic effects. The effects due to the photo-oxidation and degradation in soil on the composites depended on the different chemical composition of… More >

  • Open Access


    A Review of Recent Advances in Hybrid Natural Fiber Reinforced Polymer Composites

    Jorge Neto, Henrique Queiroz, Ricardo Aguiar, Rosemere Lima, Daniel Cavalcanti, Mariana Doina Banea*

    Journal of Renewable Materials, Vol.10, No.3, pp. 561-589, 2022, DOI:10.32604/jrm.2022.017434

    Abstract Natural fiber reinforced polymer composites (NFRCs) have demonstrated great potential for many different applications in various industries due to their advantages compared to synthetic fiber-reinforced composites, such as low environmental impact and low cost. However, one of the drawbacks is that the NFRCs present relatively low mechanical properties and the absorption of humidity due to the hydrophilic characteristic of the natural fibre. One method to increase their performance is hybridization. Therefore, understanding the properties and potential of using multiple reinforcement’s materials to develop hybrid composites is of great interest. This paper provides an overview of the recent advances in hybrid… More > Graphic Abstract

    A Review of Recent Advances in Hybrid Natural Fiber Reinforced Polymer Composites

  • Open Access


    Water Repellency of Cellulosic Fibrous Mats Impregnated with Organic Solutions Based on Recycled Polystyrene

    Dafni Foti1, Costas Passialis1, Elias Voulgaridis1, Stergios Adamopoulos2,*

    Journal of Renewable Materials, Vol.9, No.1, pp. 85-96, 2021, DOI:10.32604/jrm.2021.011868

    Abstract Recycled polystyrene in combination with paraffin wax, alkyd resin, and gum rosin were used as components in formulations to investigate their water repellency when applied to cellulosic filter paper substrates. Polystyrene was used in concentration of 5, 10, 15 and 20%, alkyd resin and gum rosin of 5% each and paraffin wax of 0.5%. Totally, twenty four water repellent solutions were prepared. Water repellency was evaluated in terms of water absorption of the cellulosic fibrous mats. The relations between retention of solid substances of the formulations and grammage and water absorption of filter paper samples were also determined. The results… More >

  • Open Access


    Novel Mycelium-Based Biocomposites (MBB) as Building Materials

    Zinta Zimele1,*, Ilze Irbe2, Juris Grinins2, Oskars Bikovens2, Anrijs Verovkins2, Diana Bajare1

    Journal of Renewable Materials, Vol.8, No.9, pp. 1067-1076, 2020, DOI:10.32604/jrm.2020.09646

    Abstract Novel mycelium-based biocomposites (MBB) were obtained from local agricultural (hemp shives) and forestry (wood chips) by-products which were bounded together with natural growth of fungal mycelium. As a result, hemp mycocomposites (HMC) and wood mycocomposites (WMC) were manufactured. Mechanical, water absorption and biodegradation properties of MBB were investigated. MBB were characterized also by ash content and elemental composition. The results of MBB were compared with the reference materials such as the commercial MBB material manufactured by Ecovative® Design (EV), hemp magnesium oxychloride concrete (HC) and cemented wood wool panel (CW), manufactured by CEWOOD®. The mechanical properties of HMC and WMC… More >

  • Open Access


    Experimental Research on the Physical and Mechanical Properties of Concrete with Recycled Plastic Aggregates

    Haikuan Wu1,2, Changwu Liu1,2,*, Song Shi1,2, Kangliang Chen1,2

    Journal of Renewable Materials, Vol.8, No.7, pp. 727-738, 2020, DOI:10.32604/jrm.2020.09589

    Abstract In order to study the effect of recycled plastic particles on the physical and mechanical properties of concrete, recycled plastic concrete with 0, 3%, 5% and 7% content (by weight) was designed. The compressive strength, splitting tensile strength and the change of mass caused by water absorption during curing were measured. The results show that the strength of concrete is increased by adding recycled plastic into concrete. Among them, the compressive strength and the splitting tensile strength of concrete is the best when the plastic content is 5%. With the increase of plastic content, the development speed of early strength… More >

  • Open Access


    Study on the Effect of Surface Modification on the Mechanical and Thermal Behaviour of Flax, Sisal and Glass Fiber-Reinforced Epoxy Hybrid Composites

    C. M. Meenakshi, A. Krishnamoorthy*

    Journal of Renewable Materials, Vol.7, No.2, pp. 153-169, 2019, DOI:10.32604/jrm.2019.00046

    Abstract Natural fiber-reinforced hybrid composites can be a better replacement for plastic composites since these plastic composites pose a serious threat to the environment. The aim of this study is to analyze the effect of surface modification of the natural fibers on the mechanical, thermal, hygrothermal, and water absorption behaviors of flax, sisal, and glass fiber-reinforced epoxy hybrid composites. The mechanical properties of alkaline treated sisal and flax fibers were found to increase considerably.Tensile, flexural and impact strength of glass/flax-fiber-reinforced hybrid samples improved by 58%, 36%, and 51%, respectively, after surface alkaline treatment. In addition, the hygrothermal analysis and water absorption… More >

  • Open Access


    Supercritical Carbon Dioxide Treated Kenaf Bast Pulp Fiber Reinforcement in Epoxy Composite

    N. A. Sri Aprilia1, M. S. Nurul Atiqah2, Zhari Ismail3, C. Y. Loo2, Chaturbhuj K. Saurabh2, Rudi Dungani4, Abdul Khalil H.P.S2*

    Journal of Renewable Materials, Vol.5, No.5, pp. 380-387, 2017, DOI:10.7569/JRM.2017.634130

    Abstract Due to environmental concerns, green composites have become a highly researched material. In the present study, kenaf fiber was used as reinforcement in epoxy-based composite with weight fraction ranges from 0, 5, 10, and 15% (w/w of resin). The ratio of epoxy to hardener was 65:32.5. Prior to incorporation, kenaf bast fiber underwent Soda-AQ pulping followed by total chlorine-free bleaching (OAZP sequence). The obtained pulp was then subjected to supercritical carbon dioxide extraction (SCE) treatment. It was observed that epoxy composite with 10% of fiber loading demonstrated the highest mechanical properties with a tensile strength of 64 MPa, tensile modulus… More >

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