Green Materials最新文献_第9页

Effect of coupling agent and alkali treatment on mechanical, thermal and morphological properties of flax-fiber-reinforced PLA composites 偶联剂和碱处理对亚麻纤维增强PLA复合材料力学、热学和形态性能的影响

IF 1.9 4区材料科学

Green Materials Pub Date : 2021-09-13 DOI: 20.00062

Ali Avci, Aysegul Akdogan Eker, Mehmet Safa Bodur

{"title":"Effect of coupling agent and alkali treatment on mechanical, thermal and morphological properties of flax-fiber-reinforced PLA composites","authors":"Ali Avci, Aysegul Akdogan Eker, Mehmet Safa Bodur","doi":"20.00062","DOIUrl":"https://doi.org/20.00062","url":null,"abstract":"In the current study, three different types of biocomposites based on poly(lactic acid) (PLA) and short flax fiber were produced using extrusion. Alkali treatment was conducted on the flax fiber before the extrusion process in order to improve the interfacial adhesion between the flax fiber and the PLA matrix. The influence of the coupling agent and alkali treatment on the composite materials was investigated with regard to the mechanical, thermal and thermomechanical properties of the injected composites. The results show that the coupling agent has a favorable effect on the thermal, thermomechanical and mechanical properties of the composites. The flexural and tensile moduli of the composites were significantly enhanced compared with those of pure PLA samples. Dynamic mechanical thermal analysis and thermogravimetric analysis (TGA) results indicate that the loss and storage modulus of PLA/flax fiber composites are increased compared with those of both pure PLA and composites with the coupling agent. The TGA showed that the thermal stability of PLA improved with the addition of flax fiber into PLA. Additionally, the developed flax fiber content in PLA with the coupling agent improved the tensile, flexural strength and flexural modulus. The tensile strength of the alkali-treated flax fiber increased up to 50 MPa compared with that of the untreated flax fiber. The Fourier transform infrared spectroscopy method was carried out to examine the chemical composition of the composite and interaction of functional groups for both alkali-treated and untreated flax fibers.","PeriodicalId":12929,"journal":{"name":"Green Materials","volume":"66 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138542447","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

Impact of grain size and reactant ratio on reduction of CO2 to CH4 by alkali metal hydride 晶粒尺寸和反应物配比对碱金属氢化物还原CO2制CH4的影响

IF 1.9 4区材料科学

Green Materials Pub Date : 2021-09-13 DOI: 20.00029

Juan Zhao, Yu-Jun Sheng, Yun-Lei Teng, Bao-Xia Dong

{"title":"Impact of grain size and reactant ratio on reduction of CO2 to CH4 by alkali metal hydride","authors":"Juan Zhao, Yu-Jun Sheng, Yun-Lei Teng, Bao-Xia Dong","doi":"20.00029","DOIUrl":"https://doi.org/20.00029","url":null,"abstract":"This paper aims to investigate the influence of the grain size and the alkali metal hydride (AH, where A = lithium (Li), sodium (Na) or potassium (K))/carbon dioxide (CO<sub>2</sub>) mole ratio on carbon dioxide reduction-conversion to methane (CH<sub>4</sub>) through alkali metal hydrides at an intermediate temperature. The result of this investigation shows that the grain size and AH (A = Li, Na or K)/carbon dioxide mole ratio have a considerable effect on the methane mole percentage and output. Compared with the original sample, when the lithium or potassium hydride sample is milled for 2 h, the mole percentage and output of methane increase. When the time for which the lithium or potassium hydride sample is milled is increased from 2 to 48 h, the mole percentage and output of methane change very little. For the sodium hydride and carbon dioxide system, the grain size of the sample has little effect on the methane mole percentage and output. In brief, alkali metal hydride milled for 2 h is enough for the methanation reaction. In consideration of the AH/carbon dioxide mole ratio, the effects on different reaction systems are not consistent. Activated alkali metal hydrides can effectively convert carbon dioxide to methane under various AH/carbon dioxide mole ratios, and the higher the mole ratio of AH/carbon dioxide, the better the methanation of alkali metal hydride with carbon dioxide.","PeriodicalId":12929,"journal":{"name":"Green Materials","volume":"8 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138514973","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

Polyurethane Foam from Grape Seed-Based Polyol 葡萄籽基多元醇聚氨酯泡沫

IF 1.9 4区材料科学

Green Materials Pub Date : 2021-09-08 DOI: 10.1680/JGRMA.21.00022

GuShuailing, YanTingxuan, ZuoZongtao, Shaoqiang, WangBiao, LiXinlong, GengFanhui, ZhangKai, XuXia, XuJian

引用次数: 0

AC Impedance and Dielectric Studies of Biopolymer Electrolytes Based on I-Carrageenan 基于i -卡拉胶的生物聚合物电解质的交流阻抗和介电特性研究

IF 1.9 4区材料科学

Green Materials Pub Date : 2021-09-07 DOI: 10.1680/JGRMA.21.00034

MahalakshmiThirupathi, SankareswariChandran, J. Krishnan

引用次数: 0

Biomass Based Plasticizer from Eleostearic Acid and its Effect on Plasticization, Mechanical Properties and Migration Resistance of Polyvinyl Chloride Film Eleostearic Acid生物质增塑剂及其对聚氯乙烯薄膜增塑性、力学性能和迁移阻力的影响