Banana fibers and microfibrils as lignocellulosic reinforcements in polymer composites

Ibrahim, Maha M.; Dufresne, Alain; El‐Zawawy, Waleed K.; Agblevor, Foster A.

doi:10.1016/j.carbpol.2010.03.057

Cited by 166 publications

(97 citation statements)

References 31 publications

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“…Devido à alta umidade presente no pseudocaule da bananeira, se descartado incorretamente, esta pode levar a proliferação de fungos junto aos bananais [1,2] . O uso da FB tem sido estudada e proposta como agentes de reforços em compósitos poliméricos por diversos autores [1][2][3][4][5][6][7][8] . Becker et al (2011) avaliaram compósitos poliméricos de polipopileno (PP) reforçados com fibras de bananeira, e relataram a eficiência no uso do agente compatibilizante polipropileno graftizado com anidrido maléico -PPgMA independente da ordem de misturas dos compósitos, com ganhos na estabilidade …”

Section: Introductionunclassified

Influência do Tratamento Químico da Fibra de Bananeira em Compósitos de Poli(etileno-co-acetato de vinila) com e sem Agente de Expansão

Zimmermann¹,

Turella²,

Zattera³

et al. 2014

Polímeros

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Resumo: Neste trabalho foi avaliada a influência do tratamento alcalino na fibra de bananeira (FB) e seu uso como agente de reforço em compósitos expandidos de poli(etileno-co-acetato de vinila) -EVA. O processo de mistura dos compósitos ocorreu em um misturador de rolos aberto e após conformados e expandidos em uma prensa aquecida com moldes de volumes variáveis. Os compósitos foram avaliados por suas propriedades mecânicas, térmicas e morfológicas. Os resultados indicam que o tratamento alcalino promove a extração de componentes menos estáveis na FB, tais como a lignina, hemicelulose, ceras e óleos de baixo peso molecular. O uso da FB nos compósitos proporciona um decréscimo das propriedades mecânicas de resistência à tração e rasgo em relação ao EVA puro devido a moderadas propriedades de interface polímero-fibra. Nos compósitos expandidos, as propriedades mecânicas decrescem com a diminuição da densidade em função da maior presença de espaços vazios no interior dos compósitos, porém as propriedades mecânicas específicas de resistência ao rasgo apresentaram melhores resultados com 10 pcr de FB em todos os moldes utilizados. Palavras-chave: Fibra de bananeira, EVA, compósitos expandidos, tratamento químico. Influence of the Chemical Treatment of Banana Fiber on Poly(ethylene-co-vinyl acetate) Composites with and without a Blowing AgentAbstract: In this work the influence of alkaline treatment on banana fiber (BF) and its use as reinforcement agent in expanded composites of poly(ethylene-co-vinyl acetate) -EVA were assessed. The mixing process for the composite was performed in an open roll mill, with composites being then shaped and expanded in a thermal press using variable volume molds. The composites were evaluated as for their mechanical, thermal and morphological properties. The results indicate that the alkali treatment promotes the extraction of less stable BF components such as lignin, hemicellulose, waxes and low molecular weight oils. The use of BF in the composites imparts reduction in mechanical properties of tensile and tear strength compared to neat EVA, owing to the moderate properties of the polymer-fiber interface. In expanded composites, the mechanical properties decreased with the reduction in density due to a higher amount of void spaces within the composites. However, the specific mechanical properties of tear strength showed improved results with 10 phr BF in all molds.

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Section: Introductionunclassified

Influência do Tratamento Químico da Fibra de Bananeira em Compósitos de Poli(etileno-co-acetato de vinila) com e sem Agente de Expansão

Zimmermann¹,

Turella²,

Zattera³

et al. 2014

Polímeros

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“…Peaks at 1427.32, 1373.32 and 1056.99 cm -1 were recognized in AB101-UT6 and at 1427.32, 1373.32, 1319.31 and 1056.99 cm -1 in AB610-HL30. These peaks are normally identified for cellulose in commercial α-cellulose (Figure 2) [13,14]. The peak located at 1427.32 cm -1 which was observed in all specimens except untreated kenaf corresponds to the crystallinity band [15].…”

Section: Resultsmentioning

confidence: 80%

Effect of the chemical treatments on the characteristics of natural cellulose

Muhaimin¹,

Abdilah²,

Astuti³

et al. 2014

AIP Conference Proceedings

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Abstract. In order to characterize the morphology and size distribution of the cellulose fibers, natural cellulose from kenaf bast fibers was extracted using two chemical treatments; (1) alkali-bleaching-ultrasonic treatment and (2) alkalibleaching-hydrolysis. Solutions of NaOH, H 2 O 2 and H 2 SO 4 were used for alkalization, bleaching and hydrolysis, respectively. The hydrolyzed fibers were centrifuged at a rotation speed of 10000 rpm for 10 min to separate the nanofibers from the microfibers. The separation was repeated in 7 steps by controlling pH of the solution in each step until neutrality was reached. Fourier transform infrared (FTIR) spectroscopy was performed on the fibers at the final step of each treatment: i.e. either ultrasonic treated-or hydrolyzed microfibers. Their FTIR spectra were compared with FTIR spectrum of a reference commercial α-cellulose. Changes in morphology and size distribution of the treated fibers were examined by scanning electron microscopy (SEM). FTIR spectra of ultrasonic treated-and hydrolyzed microfibers nearly coincided with the FTIR spectrum of commercial α-cellulose, suggesting successful extraction of cellulose. Ultrasonic treatment for 6 h resulted in a specific morphology in which cellulose nanofibers (≥100 nm) were distributed across the entire surface of cellulose microfibers ( 5 m). Constant magnetic stirring combined with acid hydrolysis resulted in an inhomogeneous size distribution of both cellulose rods (500 nm-3 m length, 100-200 nm diameter) and particles 100-200 nm in size. Changes in morphology of the cellulose fibers depended upon the stirring time; longer stirring time resulted in shorter fiber lengths.

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“…For adsorbed H 2 O into the fabric specimen, peaks appeared at 1638/ cm (Chung et al 2004). Peak at 1423/cm is attributed for C-H wagging of carbohydrate and lignin (Chung et al 2004;Ibrahim et al 2010). The presence of band at 1323/cm is endorsed for lignin (Miller and Wilkins 1952).…”

Section: Conformation Of Dye Molecule Into Fabricmentioning

confidence: 97%

Ecological risk assessment and health safety speculation during color fastness properties enhancement of natural dyed cotton through metallic mordants

2017

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Variety and durability of color are presumed as key constrains of natural dyes. So, this study attempts to investigate the effect of metallic mordants on the color fastness properties of ecologically dyed cotton fabric using banana floral stem sap. Color difference was measured in terms of hue (ΔH*), chroma (ΔL*) and value (ΔC*) difference. Metal ions in residual mordanting bath, dyeing wastewater and level of trace metals in the finished fabric surface were accessed to justify the environmental safety and speculate the health risk respectively. Pre-mordanted specimens were dyed at 100 °C for 60 min. Optical properties of extracted sap were observed by UV visible spectroscopy. Dye fixation with fiber was determined by FTIR-ATR spectra. Atomic absorption spectroscopy was employed to determine the trace metals in finished fabric. Effect of metallic mordants were calculated in terms of color fastness to wash, water, perspiration, rubbing and light for estimating the color durability. Except light fastness property almost all color fastness values were 4/5, i.e. very good. Light fastness properties were improved for mordanting action with metallic salts. The level of trace metals in finished fabric were within the safe zone.

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Banana fibers and microfibrils as lignocellulosic reinforcements in polymer composites

Cited by 166 publications

References 31 publications

Influência do Tratamento Químico da Fibra de Bananeira em Compósitos de Poli(etileno-co-acetato de vinila) com e sem Agente de Expansão

Influência do Tratamento Químico da Fibra de Bananeira em Compósitos de Poli(etileno-co-acetato de vinila) com e sem Agente de Expansão

Effect of the chemical treatments on the characteristics of natural cellulose

Ecological risk assessment and health safety speculation during color fastness properties enhancement of natural dyed cotton through metallic mordants

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