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Utilization of Pineapple Crown Fiber and Recycled Polypropylene for Production of Sustainable Composites

Journal of Renewable Materials 2020年第10期8卷 1327-1341页

作者： Alexandra Augusta Reichert Mariana Ribas de Sá Gabriela Escobar Hochmuller da Silva Cesar Augusto Gonçalves Beatrice AndréRicardo Fajardo Amanda Dantas de Oliveira Postgraduate Program in Materials Science and Engineering(ppgcem) Federal University of Pelotas(UFPel)Pelotas96075-630Brazil Technology Development Center(CDTec) Materials EngineeringFederal University of Pelotas(UFPel)Pelotas96075-630Brazil Postgraduate Program in Materials Science and Engineering(ppgcem) Federal University of São Carlos(UFSCar)São Carlos13565-905Brazil Laboratory of Technology and Development of Composites and Polymeric Materials Federal University of Pelotas(UFPel)Pelotas96010-900Brazil

Nowadays,the production of consumer goods is based on the use of non-renewable raw materials,which in recent years has been performing as a problem for the *** the large number of available biofibers in nature,their use in the development of polymeric composites has inevitably emerged,it is also necessary to take into account the countless discarded plastics that still have the potential to be *** this work,fibers were extracted from pineapple crown residues and utilized to compose sustainable composites using recycled polypropylene from cups discarded in the trash as a ***,it is known that for good performance,it is necessary to achieve a good chemical interaction between the fiber and the *** order to improve this interaction,alkaline mercerization treatment was carried out on the surface of the fibers removing some components incompatible with the *** this work,the effect of the mercerization treatment on the properties of the fibers was studied,as well as their interaction with the *** effect of fiber concentration on the mechanical and thermal properties of composites was also *** of 5 and 7 wt%were used for both natural and mercerized fibers.A decrease in the number of degradation stages was observed through thermogravimetry analyses(from four in natural fiber to two in mercerized fibers),showing that the mercerization performed on the fibers was *** increase in the degree of crystallinity of mercerized fibers was also observed through the results of X-ray *** techniques indicate that amorphous compounds,such as hemicellulose and lignin,were partially *** the tensile test,it could be noted that all composites presented higher values of de elastic modulus than recycled polypropylene without added load;however,there were no differences in the elastic modulus between the different types of fibers and load ***,it is interesting to use fibers as r

关键词： Recycling composites polypropylene biofibers pineapple crown

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Liquefaction of Kraft Lignin at Atmospheric Pressure

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Journal of Renewable Materials 2019年第6期7卷 527-534页

作者： Silvia Helena Fuentes da Silva Patricia Soares Bilhalva dos Santos Darci Alberto Gatto Maria Angeles Andres Itziar Egüés Chemical and Environmental Engineering Department University of Basque CountryPlaza Europa 120018Donostia-San SebastiánSpain Faculty of Forestry Engineering Federal University of ParáC.JoséPorfirio2515AltamiraBrazil College of Material Engineering(ppgcem) Federal University of PelotasBrazil

Kraft lignin was liquefied using polyethylene glycol#400(PEG)and glycerol(G)in a weight ratio of 80/20(w/w)and sulphuric acid(SA)as catalyst under atmospheric pressure at 160º*** three independent variables:reaction time(60,80 and 100 min),percentage of lignin(15,20 and 25%,w/w),and catalyst concentration(0,3 and 6%,w/w),were varied resulting in 27 experimental *** effect of these reaction conditions on the properties of the polyols was *** statistical analysis showed that only“the percentage of lignin”did not influence the properties of the liquefied products,however,reaction time and catalyst load were important *** resulting liquefied products were characterized by FTIR analysis.

关键词： Biopolyols Kraft lignin liquefaction renewable resource thermochemical conversion

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Synthesis of Mesoporous Material from Chrysotile-Derived Silica

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Materials Sciences and Applications 2013年第8期4卷 68-72页

作者： Anderson Joel Schwanke Christian Wittee Lopes Sibele Berenice Castella Pergher ppgcem Universidade Federal do Rio Grande do NorteNatalBrazil Chemistry Institute Universidade Federal do Rio Grande do NorteNatalBrazil

Mesoporous MCM-41-type molecular sieves were synthesized using calcined and leached chrysotile and cetyltrimethylammonium bromide as the silica source and structure directing agent, respectively. Powder X-ray diffraction (XRD), N2 isothermal adsorption-desorption, scanning electron microscopy (SEM) and thermogravimetric analysis (TGA) were used to characterize the samples. The calcined and leached chrysotile can be employed as an inexpensive silica source for the formation of low-order MCM-41 mesoporous materials.

关键词： MCM-41 Chrysotile Silica Source

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NiO-CGO Composite for SOFC Anode： Synthesis and Characterization

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材料科学与工程（中英文版） 2010年第5期4卷 33-39页

作者： Beatriz Cela Daniel Araujo de Macedol Graziele Lopes de Souza Auristela Carla de Miranda Antonio Eduardo Martine Rubens Maribondo do Nascimento Carlos Alberto Paskocimas ppgcem CCET Federal University of Rio Grande do Norte 1524 - 59072-970 Natal RN Brazil Chemical Engineering Department CT Federal University of Rio Grande do Norte Natal 1524 - 59072-970 RN Brazil

In this work compounds of gadolinium-doped ceria, Ce0.9Gd0.1O1.95 (CGO) and NiO were synthesized by polymeric precursor method. NiO-Ce0.9Gd0.1O1.95 composite was attained by mixture of the powders of the both phases calcinated already. The precursor powders were characterized by simultaneous thermogravimetry-differential thermal analysis and the calcined materials were studied by X-ray diffraction, scanning electronic microscopy, Fourier transform infrared spectroscopy and dilatometry. The refinement of the diffraction data indicated that the powders were crystallized in the wanted phases. All the produced powders had nanometric and sub micrometric features. The produced composite showed good characteristics for the use as anode for SOFC.

关键词：固体氧化物燃料电池复合材料区政府 NIO 合成阳极聚合物前驱体法傅立叶变换红外光谱

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