What could be greener than composites made from polysaccharides?

Simkovic, I

doi:10.1016/j.carbpol.2008.07.009

Cited by 79 publications

(21 citation statements)

References 65 publications

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“…177,178 Os compósitos de fibras naturais/ plásticos são produzidos pela união de fibras naturais e polímeros não-biodegradáveis, sendo principalmente os derivados de petróleo, enquanto os compósitos verdes são preparados utilizando polímeros naturais biodegradáveis, principalmente polissacarídeos e poli-hidroxialcanoatos. Os poli-hidroxialcanoatos são poliésteres alifáticos que, ao contrário dos poliésteres aromáticos, são considerados biodegradáveis.…”

Section: Biocompósitos: Fibras Lignocelulósicas E Polímeros Biodegradunclassified

Aplicações de fibras lignocelulósicas na química de polímeros e em compósitos

2009

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Recebido em 19/1/09; aceito em 25/3/09; publicado na web em 2/4/09 APPLICATIONS OF LIGNOCELLULOSIC FIBERS IN POLYMER CHEMISTRY AND IN COMPOSITES. The use of lignocellulosic fibers and their constituents, as raw materials in the production of polymeric and composite materials, represent an exceptional opportunity of sustainable technological development. In the present report works that discuss promising alternatives of obtaining and use of materials such as cellulose, hemicellulose, lignin, cellulose nanocrystals and biocomposites were revised. The advance in the use of biomass can be, in a near future, capable of going beyond the application difficulties of these vast materials, especially in relation to the economical unviability, by the production of high performance polymeric and composite materials. This advance would represent a higher profitability to some areas of agrobusiness, especially the sector of biofuels, which produces elevated amounts of biomass waste.Keywords: lignocellulosic fibers; nanowhiskers; biocomposites. introduçÃoNos últimos anos tem surgido um grande interesse mundial no desenvolvimento de tecnologias "verdes" que possibilitem a utilização de produtos de menor impacto ambiental.1-4 A química "verde", como um todo, implica no desenvolvimento de processos químicos e produtos que levem a um ambiente mais limpo, saudável e sustentável. Neste contexto, os materiais plásticos sintéticos têm recebido especial atenção por conter em seus métodos de preparação questões que devem ser priorizadas. As questões que devem ser priorizadas são a não-biodegradabilidade dos plásticos sintéticos e por serem oriundos de fontes não-renováveis. 5-8Na busca pela sustentabilidade, várias pesquisas e trabalhos na área de materiais poliméricos e compósitos foram, e estão sendo, realizados para garantir a preservação ambiental e proporcionar um melhor padrão de vida à sociedade.9-13 Dentre as pesquisas nesta área, as que buscam a aplicação de recursos naturais na preparação dos materiais vêm crescendo, podendo-se destacar o uso de fibras naturais. [14][15][16][17][18][19][20][21][22] A Organização das Nações Unidas para a Agricultura e a Alimentação (FAO-ONU -Food and Agriculture Organization of the United Nations) declarou o ano de 2009 como o ano internacional das fibras naturais.23 A medida visa conscientizar e estimular a utilização de fibras naturais, encorajando políticas governamentais de incentivo ao setor e às ações empresariais sustentáveis, para a exploração dessas matérias-primas.Destaque ainda maior deve ser dado à utilização de fibras naturais de origem vegetal, em razão da enorme variedade de espécies passí-veis de serem pesquisadas. Diversas fibras vegetais são produzidas em praticamente todos os países e usualmente são designadas como materiais lignocelulósicos. Algumas fibras ocorrem espontaneamente na natureza, outras são cultivadas como atividade agrícola e ainda há aquelas que são resíduos gerados, principalmente, pela agroindústria. Na Tabela 1 pode ser verificada a produção anual das princ...

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Section: Biocompósitos: Fibras Lignocelulósicas E Polímeros Biodegradunclassified

Aplicações de fibras lignocelulósicas na química de polímeros e em compósitos

2009

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“…Among them, the design of environmentally friendly hydrogel materials based on naturally occurred materials, such as polysaccharide and clay minerals, has especially been focused due to the increasing public concerns on the environmental protection topic and the safety of materials. 16,17 Polysaccharides including starch, 18 cellulose, 19 guar gum, 20 κ-carrageenan, 21 chitosan, 22 cashew gum, 23 alginate, 24 and pectin 2,25 etc. have become the preferred and promising matrix for preparing hydrogel because their renewable, lowcost, non-toxic, biodegradable and biocompatible superiors and clay minerals can act as effective fillers to adjust the swelling degree of the hydrogel materials.…”

Section: Introductionmentioning

confidence: 99%

“…The composite of polysaccharides and inorganic clay minerals showed surprising performance superior to their individual components and has been honored as the materials "in greening the 21st century materials world". 16 Sodium alginate (NaAlg) is a renewable anionic linear natural polysaccharide extracted from marine algae or produced by bacteria. NaAlg is composed of poly-β-1,4-Dmannuronic acid (M units) and α-1,4-L-glucuronic acid (G units) in varying proportions, and so it is renewable, water soluble, odourless, non-toxic and biodegradable.…”

Section: Introductionmentioning

confidence: 99%

A pH-sensitive composite hydrogel based on sodium alginate and medical stone: Synthesis, swelling, and heavy metal ions adsorption properties

Gao

Wang

2011

Macromol. Res.

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New pH-sensitive composite hydrogels were synthesized by free-radical graft copolymerization among sodium alginate (NaAlg), sodium acrylate (NaA), and medical stone (MS). Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), tronsmission electron microscopy (TEM), and thermogravimetric analysis (TGA) analyses confirmed that NaA was grafted onto the NaAlg chains and MS participate in polymerization by its active silanol groups, and the surface morphologies and thermal stability was clearly improved after incorporating MS. The swelling capacity and rate of the hydrogel were clearly enhanced by introducing MS, and the intriguing deswelling in gelatin solution and "overflowing" behaviors in dimethyl sulfoxide (DMSO) and glycerin solutions were observed. In addition, the composite hydrogels exhibited excellent adsorption capacity on heavy metal ions, which enhanced the adsorption of Ni 2+ , Cu 2+ , Zn 2+ and Cd 2+ ions by 10.4, 8.0, 23.0, and 14.3 fold compared to active carbon (AC), and by 17.3, 16.0, 38.3 and 23.8 fold compared to MS, respectively. The biopolymer-based composite hydrogel can be used as a potential water-saving material and candidate of AC for heavy metal removal.

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“…A fierce public debate regarding the future of the earth and the need for transition toward a CO 2 neutral bio-based economy was emphasized in the UN conference on climate change [12]. To this end, polymeric carbohydrates, e.g., starch, cellulose, chitin, inulin, chitosan, lignin, etc., are natural polymers found abundantly in nature as structural building elements and could be potential alternatives for petroleum-based nonbiodegradable polymers [13].…”

Section: Introductionmentioning

confidence: 99%

Green Composites from Ionic Liquid-Assisted Processing of Sustainable Resources: A Brief Overview

Mahmood¹,

Moniruzzaman²,

Yusup³

et al. 2017

Progress and Developments in Ionic Liquids

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The massive use of synthetic, petroleum-based polymeric composites has disturbed the fragile environmental equilibrium of our planet. Composites made solely from polysaccharides can offer unique intrinsic properties such as renewability, biodegradability, easy availability, eco-friendliness, facile processing, flexibility, and exciting physico-mechanical characteristics. The development of green processing of lignocellulosic materials and bio-based polymers such as cellulose, starch, chitin, and chitosan, the most abundant biorenewable materials on earth, is urgent from the perspectives of both environmental protection and sustainability in materials industries. Recently, the enormous potential of ionic liquids (ILs) as an alternative to ecologically harmful conventional organic solvents has been well recognized. Presently, a wide range of pronounced approaches have been explored to further improve the performance of ionic liquid-based processing of polysaccharides for green composite manufacturing. This review presents recent technological developments in which the advantages of ionic liquids as a dissolution medium for polysaccharides for production of plethora of green composites have been gradually realized.

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What could be greener than composites made from polysaccharides?

Cited by 79 publications

References 65 publications

Aplicações de fibras lignocelulósicas na química de polímeros e em compósitos

Aplicações de fibras lignocelulósicas na química de polímeros e em compósitos

A pH-sensitive composite hydrogel based on sodium alginate and medical stone: Synthesis, swelling, and heavy metal ions adsorption properties

Green Composites from Ionic Liquid-Assisted Processing of Sustainable Resources: A Brief Overview

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