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Search Results (4)

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Keywords = wood-plasticized starch composites

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20 pages, 3142 KiB  
Article
The Re-/Up-Cycling of Wood Waste in Wood–Polymer Composites (WPCs) for Common Applications
by Carmen-Alice Teacă, Asim Shahzad, Ioana A. Duceac and Fulga Tanasă
Polymers 2023, 15(16), 3467; https://doi.org/10.3390/polym15163467 - 19 Aug 2023
Cited by 6 | Viewed by 2787
Abstract
Wood–polymer composites (WPCs) are a class of materials intensively studied and promoted in the context of sustainable development, mainly when aspects related to the increasing awareness of environmental issues and waste management are considered. Feasible opportunities for producing WPCs with value-added properties intended [...] Read more.
Wood–polymer composites (WPCs) are a class of materials intensively studied and promoted in the context of sustainable development, mainly when aspects related to the increasing awareness of environmental issues and waste management are considered. Feasible opportunities for producing WPCs with value-added properties intended for common applications emerge when polymers, either synthetic or from renewable resources, raw or waste, are employed in re-/up-cycling approaches. In this context, some examples of easily achievable WPCs are presented herein, namely, formulations based on different wood waste and polymer matrices (synthetic: polypropylene and malleated polypropylene as a compatibilizer; natural: plasticized starch). Their level of performance was assessed through different characterization methods (FTIR, WAXD, TGA, DSC, mechanical test, etc.). The benefits and limitations of this approach are also discussed. Full article
(This article belongs to the Special Issue Wood Waste-Based Composites)
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14 pages, 3184 KiB  
Article
Effect of Irradiation Process on Physical and Chemical Properties and Mildew Resistance of Bamboo
by Shengfeng Mao, Zhuchao Xu, Qiuyi Wang, Xin Han, Xinzhou Wang, Meiling Chen and Yanjun Li
Forests 2023, 14(5), 1055; https://doi.org/10.3390/f14051055 - 20 May 2023
Cited by 6 | Viewed by 2463
Abstract
With the scarcity of wood resources and calls for “substituting bamboo for wood” and “substituting bamboo for plastic”, bamboo has gained greater popularity for its abundant reserves and outstanding mechanical properties. However, Mildew is a common problem for bamboo, which can significantly reduce [...] Read more.
With the scarcity of wood resources and calls for “substituting bamboo for wood” and “substituting bamboo for plastic”, bamboo has gained greater popularity for its abundant reserves and outstanding mechanical properties. However, Mildew is a common problem for bamboo, which can significantly reduce the quality and service lives of bamboo products. In this work, a safe, eco-friendly, controllable and efficient method of gamma-ray irradiation was used to modify bamboo. The irradiation dose, moisture content (MC), and irradiation dose rate were adopted as factors of an orthogonal experiment. The results showed that the bamboo strips reached their best mechanical properties under the condition of irradiation at 150 KGy doses, moisture content of 40%, and irradiation dose rate of 44 KGy/H. In addition, the change in the chemical composition of bamboo and mildew resistance was also explored in this paper. The major chemical components (cellulose, hemicellulose and lignin), as well as starch, were degraded, and the bamboo strips exhibited excellent mildew resistance after gamma-ray irradiation. Full article
(This article belongs to the Section Wood Science and Forest Products)
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20 pages, 3046 KiB  
Article
Potential of Using Natural and Synthetic Binder in Wood Composites
by Kangchiang Liew, Yufeng Tan, Charles Michael Albert, Vinodini Raman and Michelle Boyou
Forests 2022, 13(6), 844; https://doi.org/10.3390/f13060844 - 28 May 2022
Cited by 5 | Viewed by 5797
Abstract
The physical and mechanical properties of particleboard bonded with different cooking percentages of seaweed (Kappaphycus alvarezii), with different percentages of starch and different percentages of adhesives, and wood plastic composite (WPC) from High-Density Polyethlene (HDPE) with Acacia mangium wood powder were [...] Read more.
The physical and mechanical properties of particleboard bonded with different cooking percentages of seaweed (Kappaphycus alvarezii), with different percentages of starch and different percentages of adhesives, and wood plastic composite (WPC) from High-Density Polyethlene (HDPE) with Acacia mangium wood powder were determined in this study. Seaweed mixed with different percentages of sulfuric acid (30%, 50%, 70%) and Sodium Hydroxide (70%, 50%, 30%) were prepared as a binder for particleboard. For a starch-based binder, different percentages of starch (10%, 15%, 20%) were prepared, before producing particleboard with different amounts of binder (20%, 25%, 30%). As for WPC, wood powders were bonded with different percentages of HDPE content (70%, 80%, 90%). Results indicated that WPC at 90% HDPE shows the best performance in the water absorption (0.07%) and thickness swelling test (2.54%). Starch-based particleboard recorded the highest Modulus of Elasticity (MOE) value (1115.07 N/mm2 at 15% starch with 30% amount of binder), while WPC (90% HDPE) and starch-based particleboard (10% starch with 20% amount of binder) both recorded the highest Modulus of Rupture (MOR) at the same value, which is 7.84 N/mm2. Starch-based particleboard has a better internal bond, which is 0.05 N/mm2. However, seaweed-based particleboard has a higher density value, which is 0.6 g/cm3. Full article
(This article belongs to the Special Issue Frontiers in Modification of Wood and Wood-Based Composites)
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16 pages, 1333 KiB  
Review
Modified Starch-Based Adhesives: A Review
by Jidapa Watcharakitti, Ei Ei Win, Jaturavit Nimnuan and Siwaporn Meejoo Smith
Polymers 2022, 14(10), 2023; https://doi.org/10.3390/polym14102023 - 16 May 2022
Cited by 78 | Viewed by 17520
Abstract
Consumer trends towards environmentally friendly products are driving plastics industries to investigate more benign alternatives to petroleum-based polymers. In the case of adhesives, one possibility to achieve sustainable production is to use non-toxic, low-cost starches as biodegradable raw materials for adhesive production. While [...] Read more.
Consumer trends towards environmentally friendly products are driving plastics industries to investigate more benign alternatives to petroleum-based polymers. In the case of adhesives, one possibility to achieve sustainable production is to use non-toxic, low-cost starches as biodegradable raw materials for adhesive production. While native starch contains only hydroxyl groups and has limited scope, chemically modified starch shows superior water resistance properties for adhesive applications. Esterified starches, starches with ester substituents, can be feasibly produced and utilized to prepare bio-based adhesives with improved water resistance. Syntheses of esterified starch materials can involve esterification, transesterification, alkylation, acetylation, succinylation, or enzymatic reactions. The main focus of this review is on the production of esterified starches and their utilization in adhesive applications (for paper, plywood, wood composites, fiberboard, and particleboard). The latter part of this review discusses other processes (etherification, crosslinking, grafting, oxidation, or utilizing biobased coupling agents) to prepare modified starches that can be further applied in adhesive production. Further discussion on the characteristics of modified starch materials and required processing methods for adhesive production is also included. Full article
(This article belongs to the Special Issue Polysaccharides: Structure, Properties, and Applications)
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