Micro/Nanofibrilas Celulósicas De  Eucalyptus Em Fibrocimentos Extrudados

Fonseca, Carlos M.; Silva, Thaís Ferreira da; Silva, Matheus Felipe; Oliveira, I. R. de.; Mendes, Rafael Farinassi; Hein, Paulo Ricardo Gherardi; Mendes, Lourival Marin; Tonoli, Gustavo Henrique Denzin

doi:10.1590/01047760201622012084

Cited by 39 publications

(12 citation statements)

References 26 publications

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“…The acid hydrolysis is selective on degradation of amorphous holocellulose, resulting in colloid suspensions of welldefined cellulose nanocrystals (ALEMDAR; SAIN, 2008). Cellulose nanofibers have been studied for a myriad of applications, such as biofilms (GUIMARÃES JR. et al, 2015;BUFALINO et al, 2015a;BUFALINO et al, 2015b;SCATOLINO et al, 2017a;SCATOLINO et al, 2017b), reinforced papers (LAVOINE et al, 2014;MIRMEHDI et al, 2017), nano-metal complexes (DONIA et al, 2012;GUPTA et al, 2013;ARANTES et al, 2017), hybrid materials (FORTUNATI et al, 2014;RAABE et al, 2014;RAABE et al, 2015), biomedical products (SVENSSON et al, 2005;NIKOLAJASKI et al, 2012) and fiber-cements (FONSECA et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Strength Improvement of Hydroxypropyl Methylcellulose/ Starch Films Using Cellulose Nanocrystals

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Mirmehdi

et al. 2017

CERNE

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Interest in cellulose nanocrystals obtained from natural resources has grown mainly because of features that such materials provide when inserted into polymeric matrices. The present study aimed to evaluate the effect of cellulose nanocrystals addition on mechanical properties of biofilms made from hypromellose (or hydroxypropyl methylcellulose - HPMC) and cassava starch blends (CS). The cellulose nanocrystals were produced by acid hydrolysis and characterized by optical microscopy (OM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and thermogravimetry (TG). Films were made with pure CS, pure hypromellose and also with blends of CS and hypromellose by casting. Then cellulose nanocrystals were added to the blends in the concentrations of 1, 3 and 10% (m/m). Evaluations of the films included tensile performance and fracture surface by scanning electron microscopy (SEM). It was observed that the reinforcement with nanocrystals improved the mechanical properties of the films, and their fracture surface showed that cellulose nanocrystals promoted an improvement in the cohesion of the hypromellose and starch molecules in the blend, and created a more homogeneous surface.

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Section: Introductionmentioning

confidence: 99%

Strength Improvement of Hydroxypropyl Methylcellulose/ Starch Films Using Cellulose Nanocrystals

Prado

Raabe

Mirmehdi

et al. 2017

CERNE

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“…Statistical similarity was found between the Young's Modulus values estimated by particle image velocimetry and the universal testing machine, both of which were different from the transversal vibration method. Fonseca et al (2016) have had difficulty relating to Young's Modulus found by the transversal vibration and the universal machine. For Cedrela spp., low-density wood (ρ=0.260 g.cm -3 ), there was no difference between the methods.…”

Section: Calculation the Young's Modulusmentioning

confidence: 99%

Particle Image Velocimetry for Estimating the Young’s Modulus of Wood Specimens

Guedes

Pereira

Rivieira

et al. 2019

CERNE

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Proposing technological innovations in the investigation of the structure and behaviour of wood is important to optimize its use. The assimilation of methods diffused in other areas, such as particle image velocimetry (PIV), can allow a rich range of information for different aspects. The aim of this study was to estimate the Young's modulus using the PIV technique, independently of the wood density. The Young modulus value was obtained by universal testing machine, transversal vibration and PIV technique. Cedrela spp. and Eucalyptus cloeziana wood specimens were analyzed and their Young modulus were compared and correlated. The PIV technique presented mean Young's modulus values statistically equal to those of the universal testing machine. The standard error of prediction from PIV approach was 0.46 and 0.97 GPa for Young's modulus estimates for Cedrela spp. and Eucalyptus cloeziana wood, respectively. v.25 n.2 2019 241 CERNE GUEDES et al.

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“…Para obtenção das nanofibrilas celulósicas, das suspensões de revestimento de nanofibrilas celulósicas e nanoargila e síntese das emulsões seguiu-se os passos descritos na Figura 1, sendo que para obtenção das nanofibrilas celulósicas foram usadas metodologias de trabalhos anteriores (ARANTES et al, 2017;BUFALINO et al, 2015FONSECA et al, 2016GUIMARÃES JÚNIOR et al, 2015;TONOLI et al, 2016). Para a síntese das emulsões utilizou-se a metodologia adaptada de Gonçalves (2000).…”

Section: Obtenção E Preparo Das Suspensões De Nanofibrilas Celulósicaunclassified

Incorporação de Nanomateriais e emulsão de ceras no desenvolvimento de papéis multicamadas

Matos¹,

Rompa²,

Damásio³

et al. 2019

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The objective of this work was to evaluate the effects of coating by deposition of cellulose nanofibrils, nanoargila and wax emulsion of bee and carnauba in the grammage, thickness and water vapor permeability of kraft papers. The suspensions were deposited by spatulation on kraft paper of 60 g/m 2 until they reached a grammage of 80 g/m 2 , where treatments containing only layers of cellulose nanofibrils (NF) and layers of nanoargila (MMT) were prepared, treatments with layers of cellulose nanofibrils overlaid by carnauba wax emulsion (NF/EC) and bee (NF/EA), treatments with layers of nanoargila also overlaid by emulsion layers of carnauba wax (MMT/EC) and bee wax (MMT/EA) and treatments with only the emulsions of the waxes (EC and EA). The treatments were compared with the kraft papers of 60 g/m 2 (Ref 60) and 80 g/m 2 (Ref 80). The scanning electron microscopy images of the surface and the cross sections showed a significant reduction of the voids present in the reference paper (60 g/m 2 ). With the increase of the wax emulsion layer, EC and EA showed a reduction of 87% and 69% in the water vapor permeability (PVA) of 60 g/m 2 paper, respectively. When compared to the 80 g/m 2 paper, this reduction in PVA was even higher (96% and 90%, respectively). When the layers of emulsions were associated with layers of nanoargila (MMT/EC = 2.3 g.mm/dia.m 2 .KPa and MMT/EA = 4.4 g.mm/dia.m 2 .KPa) these obtained

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Micro/Nanofibrilas Celulósicas De Eucalyptus Em Fibrocimentos Extrudados

Cited by 39 publications

References 26 publications

Strength Improvement of Hydroxypropyl Methylcellulose/ Starch Films Using Cellulose Nanocrystals

Strength Improvement of Hydroxypropyl Methylcellulose/ Starch Films Using Cellulose Nanocrystals

Particle Image Velocimetry for Estimating the Young’s Modulus of Wood Specimens

Incorporação de Nanomateriais e emulsão de ceras no desenvolvimento de papéis multicamadas

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