Influence of graphite and wood-based fillers on the flammability of flexible polyurethane foams

Wolska, A.; Goździkiewicz, Marcin; Ryszkowska, Joanna

doi:10.1007/s10853-012-6394-2

Cited by 24 publications

(14 citation statements)

References 28 publications

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“…However, the mechanical properties of PU foams were impaired with addition of EG. By using cellulose together with EG, the flammability of flexible PU foams was reduced keeping the desired mechanical properties [316].…”

Section: Foammentioning

confidence: 99%

Intumescence: Tradition versus novelty. A comprehensive review

Alongi

Han

Bourbigot³

2015

Progress in Polymer Science

458

295

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Section: Foammentioning

confidence: 99%

Intumescence: Tradition versus novelty. A comprehensive review

Alongi

Han

Bourbigot³

2015

Progress in Polymer Science

458

295

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“…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] . Entre as aplicações mais comuns de espumas flexíveis de PU, destacam-se: bancos de automóveis, colchões, travesseiros, móveis, embalagens, calçados, etc., por possuírem boa capacidade de amortecimento de impacto, flexibilidade, durabilidade e facilidade de moldagem entre outros [5][6][7][8][9] .…”

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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“…Flexible polyurethane foam (FPUF) as a type of versatile plastic material has been applied in mattresses, packaging, furniture cushioning, and automotive seating . Different from rigid polyurethane (PU) foams, FPUFs have an open cell structure and characteristics such as low density, good elastic recovery, air permeability, and acoustic absorption.…”

Section: Introductionmentioning

confidence: 99%

“…The carbon dioxide acts as a blowing agent, driving the foam expansion. Therefore, it is possible to adjust the structure of FPUFs by changing the formulation of foam preparation, and thus an FPUF can be tailored to its applications .…”

Section: Introductionmentioning

confidence: 99%

Effect of crosslinking density on resilient performance of low-resilience flexible polyurethane foams

et al. 2014

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Low-resilience flexible polyurethane foams (FPUFs) with varying crosslinking densities, were synthesized from polyols, 4, 4 0 -diphenyl methane diisocyanate (MDI-100), and water. The effects of crosslinking agent content, the molecular weight (M w ) of polyether diol, and the ratio of (polyether triol)/(polyether diol) on the resilience performance of FPUFs were investigated. Results indicate that higher crosslinking density was beneficial to the increasing of recovery time. The recovery time of the FPUF using polyether diol with M w of 400 was 24.3 s. It was 3.2 times longer compared with FPUF using polyether diol with M w of 3000. Dynamic mechanical analysis (DMA) results showed that, FPUFs with high crosslinking density displayed viscoelasticity in a wider range of temperature. However, when molecular chains were longer enough, FPUFs with low crosslinking density also demonstrated significant viscoelasticity, which is owing to the excess of physical crosslinking points. The results in stress-strain cycling and recovery time experiments were consistent with the results of DMA. POLYM. ENG. SCI., 55:308-315, 2015.

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Influence of graphite and wood-based fillers on the flammability of flexible polyurethane foams

Cited by 24 publications

References 28 publications

Intumescence: Tradition versus novelty. A comprehensive review

Intumescence: Tradition versus novelty. A comprehensive review

Obtenção de espumas flexíveis de poliuretano com celulose de Pinus elliottii

Effect of crosslinking density on resilient performance of low-resilience flexible polyurethane foams

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