Novel nanocomposites based on polyurethane and micro fibrillated cellulose

Seydibeyoğlu, M. Özgür; Oksman, Kristiina

doi:10.1016/j.compscitech.2007.08.008

Cited by 264 publications

(150 citation statements)

References 20 publications

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“…São formados basicamente por ligações uretânicas (-NH-CO-O-), e pequenos ajustes em sua formulação permitem a obtenção de materiais específicos com diferentes propriedades para aplicações como revestimentos, adesivos e compósitos, entre outros [1][2][3] . Espumas de PU podem ser classificadas como rígidas ou flexíveis, ou ainda, espumas de células abertas, quando as paredes de suas células são rompidas permitindo sua interligação por meio de poros, ou células fechadas, quando não há comunicação entre as células e o gás formado para expansão fica aprisionado em seu interior [1,4] .…”

Section: Introductionunclassified

Obtenção de espumas flexíveis de poliuretano com celulose de Pinus elliottii

et al. 2017

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ResumoNeste trabalho foram desenvolvidas espumas flexíveis de poliuretano com a adição de celulose de Pinus nas concentrações de 0,5; 1 e 2% (m/m). A celulose foi submetida ao processo de fibrilação mecânica e posterior secagem por aspersão (spray dry) sendo caracterizada quanto a sua morfologia por MEV e MET. As espumas foram produzidas pelo método de batelada (one-shot) com a adição e mistura da fibra junto ao poliol. As espumas foram caracterizadas por MEV, densidade aparente e resistência à compressão. Os principais resultados indicam que a fibrilação mecânica promove a obtenção de fibras em escala nanométrica, porém durante a secagem, ocorre aglomeração ocasionando aumento para escala micrométrica. As propriedades mecânicas da espuma obtiveram acréscimos de 40 e 50% na resistência à compressão com a adição de 0,5 e 1% de celulose, respectivamente, evidenciando seu potencial como aditivo alternativo para o desenvolvimento de espumas de poliuretano. Palavras-chave: celulose, espuma, fibrilação, poliuretano, spray dry. AbstractIn this work, flexible polyurethane foams were developed with the addition of Pinus cellulose at concentrations of 0.5; 1 and 2 wt%. The cellulose was subjected to mechanical fibrillation process and subsequent dried by spray dry process. It was characterized morphologically by SEM and TEM. The foams were produced by one-shot method by adding and mixing the fiber with the polyol. The foams were characterized by SEM, apparent density and compression strength. The main results indicate that the mechanical fibrillation promotes the obtainment of nanoscale fibers, but during the drying process, agglomeration occurs causing an increase reaching the micrometer scale. The mechanical properties of the foam increased by 40 and 50% in compressive strength with the addition of 0.5% and 1% of cellulose, respectively, showing its potential as an alternative additive for the development of polyurethane foams.

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Section: Introductionunclassified

Obtenção de espumas flexíveis de poliuretano com celulose de Pinus elliottii

et al. 2017

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“…Moreover, there was not a clear shift in the peak of the tan δ max. The reinforcing effect is likely attributable to natural fibers networks and/or strong interactions between natural fibers in the PA 6 matrix (Kim et al 2005(Kim et al , 2006Seydibeyoglu and Oksman 2008). The temperature range from -40 to 125 °C is critical for under-the-hood applications of NFCs in the automotive industry, especially at higher concentrations, which exhibited higher E' over the entire temperature range (Fig.…”

Section: Glass Transition Tempmentioning

confidence: 99%

Thermal Analysis of Polyamide 6 Composites Filled by Natural Fiber Blend

Kiziltas¹,

Han²,

Kızıltaş³

et al. 2016

BioResources

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aThis study describes changes in the viscoelastic and thermal properties of composites made with various percentages (up to 20 wt.%) of a natural fiber blend (a mixture of flax, kenaf, and hemp fibers) and polyamide 6 (PA 6). According to the differential scanning calorimetry (DSC) analyses, the incorporation of natural fibers produced minor changes in the glass transition (Tg), melting (Tm), and crystallization temperature (Tc) of the PA 6 composites. Because of the reinforcing effect of natural fibers, the storage modulus (E') from dynamic mechanical thermal analysis (DMTA) increased as the natural fiber content increased. The E' values at room temperature and Tg were 3960 MPa and 1800 MPa, respectively, with the incorporation 20 wt.% fiber, which were 68% and 193% higher than the E' value of neat PA 6. As the natural fiber content increased, the thermal stability of the composites decreased, and thermogravimetric analysis (TGA) showed that the onset temperature of rapid thermal degradation decreased from around 440 (neat PA 6) to 420 °C (20 wt.% natural fiber blend). The addition of 20 wt.% single type fibers showed comparable DSC and TG results to the incorporation of 20 wt.% natural fiber blends.

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“…Melt processing has been employed in numerous research projects in which nanocellulose was used as a minor component to reinforce a thermoplastic resin (Seydibeyoglu and Oksman 2008;Martínez-Sanz et al 2012, 2013aSuzuki et al 2013Suzuki et al , 2014Fortunati et al 2014;Ambrosio-Martin et al 2015a;Arrieta et al 2015;Ferrer et al 2016a;Herrera et al 2016;Lendvai et al 2016). After emerging from the die of the extruder, the material cools below the melting point of the matrix polymer.…”

Section: Melt Extrusionmentioning

confidence: 99%

Nanocellulose in Thin Films, Coatings, and Plies for Packaging Applications: A Review

Hubbe

Ferrer

Tyagi

et al. 2017

BioRes

244

234

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This review article was prompted by a remarkable growth in the number of scientific publications dealing with the use of nanocellulose (especially nanofibrillated cellulose (NFC), cellulose nanocrystals (CNC), and bacterial cellulose (BC)) to enhance the barrier properties and other performance attributes of new generations of packaging products. Recent research has confirmed and extended what is known about oxygen barrier and water vapor transmission performance, strength properties, and the susceptibility of nanocellulose-based films and coatings to the presence of humidity or moisture. Recent research also points to various promising strategies to prepare ecologically-friendly packaging materials, taking advantage of nanocellulose-based layers, to compete in an arena that has long been dominated by synthetic plastics. Some promising approaches entail usage of multiple layers of different materials or additives such as waxes, high-aspect ratio nano-clays, and surface-active compounds in addition to the nanocellulose material.While various high-end applications may be achieved by chemical derivatization or grafting of the nanocellulose, the current trends in research suggest that high-volume implementation will likely incorporate water-based formulations, which may include water-based dispersions or emulsions, depending on the enduses. Resources; North Carolina State University, Raleigh, NC 27695, USA; b: Nalco Champion, an Ecolab Company, 7705 Highway 90-A, Sugar Land, TX 77478, USA; c: School of Clothing and Textiles, Jiangnan University, Wuxi, Jiangsu, China; d: Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, PO Box 16300, FI-00076 Aalto, Finland; * Corresponding author: hubbe@ncsu Table B -Barrier properties of NFC films 2144 2145 2145 2149 2151 2152 2153 2155 2155 2157 2157 2158 2158 2159 2159 2166 2170 2172 2173 2174 2175 2177 2179 2208 2208 2228 REVIEW ARTICLE bioresources.com . "Nanocellulose in packaging," BioResources 12(1), 2143-2233. 2144 Keywords: Barrier properties; Water vapor transmission; Food shelf life; Oxygen transmission; Packages; Cellulose nanomaterials Contact information: a: Department of Forest Biomaterials, College of Natural INTRODUCTIONThere has been explosive growth in the publication of peer-reviewed articles that combine key words related to "packaging" and "cellulose," in combination with the terms "nanocellulose," "nanocrystal*," or "nanofibril*". As of November 2016, a search of this combination of terms showed about as many publications since the start of 2015, compared to all preceding years combined. Given such an acceleration of research around the world, it makes sense to ask whether this high amount of research effort has yet borne significant fruit. In light of this question, the emphasis of this review article is on research publications that shed light on known challenges to the successful implementation of nanocellulose products to enhance the performance of packaging.In principle, a nano...

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Novel nanocomposites based on polyurethane and micro fibrillated cellulose

Cited by 264 publications

References 20 publications

Obtenção de espumas flexíveis de poliuretano com celulose de Pinus elliottii

Obtenção de espumas flexíveis de poliuretano com celulose de Pinus elliottii

Thermal Analysis of Polyamide 6 Composites Filled by Natural Fiber Blend

Nanocellulose in Thin Films, Coatings, and Plies for Packaging Applications: A Review

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