The presented work explores the potential use of condensed tannin from Chinese bayberry to prepare polyvinyl alcohol-based films using a facile solvent casting method. Polyvinyl alcohol films incorporated with Chinese bayberry tannin presented good performance on antioxidant and thermal degradation capacity, which may provide broader formulation options for packaging materials.
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Freddy Muñoz1, Carolina Tenorio1, Róger Moya1,*, Angel Navarro-Mora2
Journal of Renewable Materials, Vol.10, No.1, pp. 1-17, 2022, DOI:10.32604/jrm.2022.017392
（This article belongs to this Special Issue: Advanced Wood Composites from Renewable Materials)
Abstract Fabrication and use of Cross Laminated Timber (CLT) using tropical woods is still limited at present. Therefore objective of the present study aims to determine the possibility of using CLT panels of 3 and 5 layers, fabricated with Tectona grandis and Gmelina arborea wood using adhesive of isocyanate polymer emulsion system catalyzed with polymeric isocyanate. Delamination, water absorption, density, flexure test, compression and glue-line shear were evaluated using ANSI/APA PRG320-2012 ASTM D198 and ASTM D4761 standard. The results showed that CLT panels of T. grandis presented higher values of density, less water absorption and lower delamination, with no evident differences… More >
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Jingjing Liao1,2, Jinxing Li2, Hongyan Wang3, Yan Zhu2, Hisham Essawy4, Guanben Du1,2,*, Xiaojian Zhou2,*
Journal of Renewable Materials, Vol.10, No.1, pp. 19-31, 2022, DOI:10.32604/jrm.2021.016152
（This article belongs to this Special Issue: Food Packaging Materials Based on Renewable Resources)
Abstract The current work explores the potential use of commercial Chinese bayberry tannin (BT) to develop antioxidant
PVA-based films using solvent casting process for packaging applications. The effect of BT concentration on opacity, water resistance and antioxidant capacity of resulting films was investigated. Properties like tensile strength,
thermal behavior, and morphological aspects were also characterized. The experimental results showed that
PVA/BT films formed with uniformly brown color and generally good transparency, offering good antioxidant
ability. The PVA film containing BT presented slightly higher water resistance according to the results of moisture
content and water vapor permeability, especially at low BT content… More >
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Jian Gong1, Lingzhi Xie1,2,*, Yongxue Li1, Zhichun Ni3, Qingzhu Wei3, Yupeng Wu4, Haonan Cheng5
Journal of Renewable Materials, Vol.10, No.1, pp. 33-51, 2022, DOI:10.32604/jrm.2021.016262
Abstract Based on the recent development of renewable energy utilization technology, in addition to centralized photovoltaic power plants, distributed photovoltaic power generation systems represented by building-integrated photovoltaic systems are frequently employed for power supply. Therefore, in the architectural design, the double-glass
photovoltaic module used in the integrated photovoltaic building system puts forward a higher load-bearing capacity requirement and the corresponding simplified method of carrying capacity check. This article focuses on the
simplified method of checking the bearing capacity of the four-sided simply supported double-glass photovoltaic
module. First, the principle of equivalent stiffness is used to calculate the effective thickness. Then, the… More >
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Zhenzhen Zhang1, Kai Lan2,*
Journal of Renewable Materials, Vol.10, No.1, pp. 53-73, 2022, DOI:10.32604/jrm.2022.017506
（This article belongs to this Special Issue: Research and Innovations in Engineered Timber and Mass Timber Products for Sustainable Built-Environment)
Abstract Understanding the economic feasibility of cross-laminated timber (CLT), an emerging and sustainable alternative to concrete and steel, is critical for the rapid expansion of the mass timber industry. However, previous studies on economic performance of CLT have not fully considered the variations in the feedstock, plant capacities, manufacturing parameters, and capital and operating costs. This study fills this gap by developing a techno-economic analysis of producing CLT panels in the Southern United States. The effects of those variations on minimum selling price (MSP) of CLT panels are explored by Monte Carlo simulation. The results show that, across all the plant… More >
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Dafni Foti1, Eleni E. Voulgaridou1, Sotirios Karastergiou2, Hamid R. Taghiyari3, Antonios N. Papadopoulos1,*
Journal of Renewable Materials, Vol.10, No.1, pp. 75-88, 2022, DOI:10.32604/jrm.2022.017759
（This article belongs to this Special Issue: Advanced Wood Composites from Renewable Materials)
Abstract The development of alternative wood composites based on the use of waste or recycled materials can be beneficial due to over exploitation of natural resources. Under this frame, an option for the successful utilization of waste polystyrene which avoids environmental problems that formaldehyde adhesives cause and also reduces waste disposal, is its potential application as a binder for the production of value-added environmentally friendly and low cost wood composites. Two types of panel were successfully made, consisting of wood dust and two recycled polystyrene contents, namely, 15% and 30%. Both physical properties, water absorption and thickness swelling, and mechanical properties,… More >
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Zhentao Chen1, Weidong Lu1,2,*, Yingwei Bao1, Jun Zhang1, Lu Wang1, Kong Yue1
Journal of Renewable Materials, Vol.10, No.1, pp. 89-104, 2022, DOI:10.32604/jrm.2021.015925
（This article belongs to this Special Issue: Research and Innovations in Engineered Timber and Mass Timber Products for Sustainable Built-Environment)
Abstract The timber-concrete composite (TCC) slabs have become a preferred choice of floor systems in modern multi
story timber buildings. This TCC slab consisted of timber and a concrete slab which were commonly connected
together with inclined self-tapping screws (STSs). To more accurately predict the fire performance of TCC slabs,
the mechanical behavior of TCC connections under high temperature was investigated by numerical simulation in
this study. The interface slip of TCC connections was simulated by a proposed Finite Element (FE) model at room
temperature, and different diameter and penetration length screws were considered. The effectiveness of this FE
model was… More >
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Huifeng Yang1,*, Junfeng Ji1, Haotian Tao2, Benkai Shi1, Junbin Hu1, Bo Wen3
Journal of Renewable Materials, Vol.10, No.1, pp. 105-117, 2022, DOI:10.32604/jrm.2021.016118
（This article belongs to this Special Issue: Research and Innovations in Engineered Timber and Mass Timber Products for Sustainable Built-Environment)
Abstract Experimental investigation on the pull-out behaviour, including the withdrawal capacity, slip stiffness and interfacial shear stress, of axially loaded screwed-in threaded rod embedded in cross laminated timber (CLT) was conducted. Specimens with varying embedment length and different number of threaded rods were tested in this
study. To prevent premature splitting failure of timber, some specimens were reinforced in the direction perpendicular to the timber grain with self-tapping screws. Test results showed that the screwed-in threaded rod connections exhibited good pull-out behaviour with high withdrawal capacity and slip stiffness. Within a certain
range, the withdrawal capacity increases considerably with the increase… More >
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Shaoxiang Cai1, Yuliang Guo1, Yanjun Li2,*
Journal of Renewable Materials, Vol.10, No.1, pp. 119-133, 2022, DOI:10.32604/jrm.2022.016260
（This article belongs to this Special Issue: Advanced Wood Composites from Renewable Materials)
Abstract In this study, Pinus massoniana Lamb at different heights, across the annual rings, and between earlywood and latewood was measured by X-ray diffraction and the chemical composition was analyzed by chemical treatment. Results indicated that the microfibril angle (MFA) decreased and the chemical composition changed little with the increase in height from 1 m to 9 m. In the radial direction, the MFA decreased and the chemical composition changed little with an increase in annual rings. The cellulose content of latewood was higher than that of earlywood. The viscoelastic changes of wood cell walls at different heights, across the annual rings by… More >
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Yuhao Jiang, Jialan Yao, Chengfei Zhu*
Journal of Renewable Materials, Vol.10, No.1, pp. 135-148, 2022, DOI:10.32604/jrm.2021.016304
Abstract Poly(urea-formaldehyde) (PUF) microcapsules were prepared by in-situ polymerization with four different processes in this paper. The chemical composition, surface morphology, particle size distribution, and thermal stability were characterized by FTIR, SEM, particle size analyzer, and TGA, respectively. The results demonstrated
that the agglomeration of the PUF microcapsules was related to the agglomeration of the emulsion particles
caused by the changes of emulsion interface during the shell polymerization. Due to the slow deposition of
the shell material, the PUF microcapsules with the core-shell structure prepared by the process with ammonium
chloride as the last additive showed good dispersibility with an average… More >
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Deniz Sema Sarul1, Dogan Arslan2, Emre Vatansever1, Yusuf Kahraman2, Ali Durmus3, Reza Salehiyan4, Mohammadreza Nofar1,2,*
Journal of Renewable Materials, Vol.10, No.1, pp. 149-164, 2022, DOI:10.32604/jrm.2022.017003
（This article belongs to this Special Issue: Polylactide Based Biopolymeric Systems)
Abstract Polylactide (PLA)/poly (butylene adipate-co-terephthalate) (PBAT) blend nanocomposites including 3 wt% of cellulose nanocrystals (CNCs) were prepared by melt compounding method in a twin-screw extruder and an internal mixer. Blend nanocomposites were formulated by diluting three different masterbatches prepared by solution casting method that contained 7 wt% of CNC. These masterbatches were: (m1) PLA/PBAT/CNC masterbatch; (m2) PLA/CNC masterbatch; and (m3) PBAT/CNC masterbatch. These were to explore how different preparation methods affect the dispersion and localization of CNC and hence the properties of PLA/PBAT/CNC blend nanocomposites. Scanning electron microscopy (SEM) was used to study the structural changes of the blends. Rheological properties… More >
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