Green Materials最新文献_第5页

Le Pacte vert au service de la sécurité humaine 为人类安全服务的绿色契约

4区材料科学

Green Materials Pub Date : 2023-08-07 DOI: 10.3917/green.003.0057

Mary Kaldor

引用次数: 0

Sortir de l’impasse sur le climat : l’Initiative Bridgetown 打破气候僵局:布里奇顿倡议

4区材料科学

Green Materials Pub Date : 2023-08-07 DOI: 10.3917/green.003.0108

Avinash Persaud

引用次数: 0

Diplomatie environnementale : points de bascule entre l’Europe et les nouveaux non-alignés 环境外交:欧洲和新的不结盟国家之间的转折点

4区材料科学

Green Materials Pub Date : 2023-08-07 DOI: 10.3917/green.003.0080

Sébastien Treyer

引用次数: 0

Le Pacte vert en quelques chiffres 绿色协议的几个数字

4区材料科学

Green Materials Pub Date : 2023-08-07 DOI: 10.3917/green.003.0010

引用次数: 0

Le financement du Pacte vert 绿色协议的融资

4区材料科学

Green Materials Pub Date : 2023-08-07 DOI: 10.3917/green.003.0037

引用次数: 0

Environnement et échange commercial international : la nouvelle posture européenne 环境与国际贸易:欧洲的新立场

4区材料科学

Green Materials Pub Date : 2023-08-07 DOI: 10.3917/green.003.0095

Pascal Lamy, Geneviève Pons

引用次数: 0

Eco-friendly lightweight composite prepared with geopolymer and wheat straw 地质聚合物与麦秆复合制备环保轻质复合材料

IF 1.9 4区材料科学

Green Materials Pub Date : 2023-07-31 DOI: 10.1680/jgrma.23.00025

Jiwei Cai, Zixian Liu, Ningwei Lv, Gelong Xu, Qing Tian, Weiguo Shen, Hao Wu

{"title":"Eco-friendly lightweight composite prepared with geopolymer and wheat straw","authors":"Jiwei Cai, Zixian Liu, Ningwei Lv, Gelong Xu, Qing Tian, Weiguo Shen, Hao Wu","doi":"10.1680/jgrma.23.00025","DOIUrl":"https://doi.org/10.1680/jgrma.23.00025","url":null,"abstract":"Agricultural waste is promising to be used for lightweight building materials. The combination of geopolymer and wheat straw (WS) is adopted to produce a kind of eco-friendly lightweight composite. Using the pretreated WS by NaOH and Na2SiO3 solutions, the influence of WS on the properties of geopolymer-wheat straw composite (GWSC) is investigated. The pretreated WS avoids the retarding effect of the untreated WS on the hydration of geopolymer and even presents an accelerating effect. Increasing the content of pretreated WS generally results in the reduction in apparent density and strength, the GWSC with the apparent density of 1000-1500 kg/m3 can be prepared, corresponding to the 28d compressive strength between 5 MPa and 25 MPa. The water absorption linearly increases with the increases of the pretreated WS content, while an appropriate amount of the pretreated WS can enhance the water resistance of GWSC. A WS/FA ratio lower than 8% can produce the GWSC with qualified thermal insulation performance. The alkaline treatment, especially NaOH treatment, significantly improves the bonding strength between fiber and geopolymer matrix. In addition, the pretreated WS saturated by NaOH and Na2SiO3 solutions is beneficial to the fluidity of geopolymer-WS mixture and could act as the internal curing agents to enhance the hydration of geopolymer.","PeriodicalId":12929,"journal":{"name":"Green Materials","volume":" ","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45681834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pore structure and cushioning properties of waste paper pulp-reinforced starch-based foams 废纸纸浆增强淀粉基泡沫的孔隙结构和缓冲性能

IF 1.9 4区材料科学

Green Materials Pub Date : 2023-07-19 DOI: 10.1680/jgrma.22.00110

Jinbao Zheng, Shan Gao, Chen Li

{"title":"Pore structure and cushioning properties of waste paper pulp-reinforced starch-based foams","authors":"Jinbao Zheng, Shan Gao, Chen Li","doi":"10.1680/jgrma.22.00110","DOIUrl":"https://doi.org/10.1680/jgrma.22.00110","url":null,"abstract":"Foamed plastics do not readily degrade, but degradable starch foam has uneven pores and poor mechanical properties. To improve the cushioning performance of starch foams, a sustainable starch-based packaging cushioning material is prepared via microwave foaming using waste corrugated paper fibers as the reinforcement material. The effects of different fiber contents on the structure and cushioning properties of starch-based foams are studied, and the possibility of replacing petroleum-based foams is discussed through comparisons with conventional cushioning materials. The results indicate that the pore structure of starch-based foaming materials can be controlled by changing the fiber dosage, and a small or excessive amount of fiber is not conducive to the uniform foaming of starch-based composite foams. When 3 g of waste-paper fiber (17.6% by weight of the starch) is added, the average diameter of the starch-based foam pores is small, the pore size distribution is relatively uniform, the minimum buffer coefficient is 4.38, and the mechanical properties are closer to those of expanded polystyrene (EPS). A peak acceleration of 942.89 m/s2 is obtained from the packaging parts with starch-based foaming materials after drop testing, which reduced the impact load by nearly 50% compared to packaging without the cushioning liner. This has the potential to become a sustainable alternative to petroleum-based packaging foams.","PeriodicalId":12929,"journal":{"name":"Green Materials","volume":" ","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41972333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Flame-retardant performance of phosphorylated furan-containing alkyd resins 含磷呋喃醇酸树脂的阻燃性能

IF 1.9 4区材料科学

Green Materials Pub Date : 2023-07-06 DOI: 10.1680/jgrma.22.00093

Maxinne Denis, Damien Le Borgne, R. Sonnier, S. Caillol, C. Negrell

{"title":"Flame-retardant performance of phosphorylated furan-containing alkyd resins","authors":"Maxinne Denis, Damien Le Borgne, R. Sonnier, S. Caillol, C. Negrell","doi":"10.1680/jgrma.22.00093","DOIUrl":"https://doi.org/10.1680/jgrma.22.00093","url":null,"abstract":"Over the past decade, with the emergence of environmental and human health concerns, research has focused on developing new solutions to replace fossil resources with more sustainable biobased resources. Furan derivatives can be obtained from plants, and their structures provide high resistance to high temperatures. Furan derivatives have been functionalized with phosphorus (P) to increase their fire-resistance properties. Thus, a new biobased bisfuran containing nitrogen and phosphorus (diethyl (((3-((((diethoxyphosphoryl)(hydroxy)(4-(hydroxymethyl)cyclopenta-1,3-dien-1-yl)methyl)amino)methyl)benzyl)amino)(hydroxy)(4-(hydroxymethyl)cyclopenta-1,3-dien-1-yl)methyl)phosphonate (HMF-MXDA-DEP)) was synthesized and used for the first time in polymerization to develop alkyd resins. The flame-retardant (FR) properties of these resins were studied. Alkyd resins are generally used as a binder in paint or varnish formulations. The use of a reactive FR during the polycondensation reaction of alkyd resins makes it possible to form covalent bonds and offer better durability over time. The impact of HMF-MXDA-DEP on film properties such as drying time, flexibility, adhesion and color was studied, and the thermal and FR properties were evaluated by differential scanning calorimetry, thermogravimetric analysis and pyrolysis–combustion flow calorimetry. Increased thermal stability and good FR properties of alkyd resins were demonstrated. In the cone calorimeter test, the lowest peak heat release rate (pHRR) was obtained with a coating of 2 wt% phosphorus HMF-MXDA-DEP on wood, and a 49% decrease in pHRR compared with that of FR-free alkyd resins was demonstrated.","PeriodicalId":12929,"journal":{"name":"Green Materials","volume":" ","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48519249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Flame retardant and anti-corrosion behaviour of sustainable composites from Aerva lanata ash and cardanol-based benzoxazine 粉煤灰和腰果酚基苯并恶嗪可持续复合材料的阻燃和防腐性能

IF 1.9 4区材料科学

Green Materials Pub Date : 2023-07-05 DOI: 10.1680/jgrma.22.00020

Narmatha Muthukumar, H. Arumugam, Balaji Krishnasamy, A. Muthusamy, Alagar Muthukaruppan

{"title":"Flame retardant and anti-corrosion behaviour of sustainable composites from Aerva lanata ash and cardanol-based benzoxazine","authors":"Narmatha Muthukumar, H. Arumugam, Balaji Krishnasamy, A. Muthusamy, Alagar Muthukaruppan","doi":"10.1680/jgrma.22.00020","DOIUrl":"https://doi.org/10.1680/jgrma.22.00020","url":null,"abstract":"A new monomer of bi-functional benzoxazine was synthesized using cardanol (C) and p-phenylenediamine (ppda) under suitable experimental conditions. The curing behaviour of C-ppda benzoxazine monomer was studied by DSC analysis and Tp of C-ppda benzoxazine was found to be 237°C. Further, benzoxazine monomer was reinforced with varying weight percentages (5, 10 and 15 wt%) of bio-ash derived from Aerva lanata (AL-ash) to obtain hybrid composites. TGA data infer that AL-ash reinforced benzoxazine composites possess an excellent thermal stability and flame retardant behaviour. The morphology of AL-ash and cardanol based benzoxazine composites was analysed using FESEM. The FESEM results infer the homogeneous distribution of AL-ash in composites. Energy dispersive X-ray (EDX) spectroscopy analysis was used to determine the elemental composition of AL-ash used for preparation of composites. The value of water contact angle of poly(C-ppda) was found to be 148°. Data obtained from corrosion studies indicated that mild steel specimen coated with benzoxazine matrix and specimen coated with bio-ash reinforced benzoxazine composites exhibit an excellent resistance towards corrosion. The bio-ash reinforced composites of cardanol based benzoxazine can be used in the form of sealants, encapsulants, adhesives, coatings and matrices in microelectronics and automobile applications under high thermal and moist environmental conditions.","PeriodicalId":12929,"journal":{"name":"Green Materials","volume":" ","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47629757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0