The use of cellulose nanocrystals to enhance the thermal insulation properties and sustainability of rigid polyurethane foam

Septevani, Athanasia Amanda; Evans, David A. C.; Annamalai, Pratheep K.; Martin, Darren J.

doi:10.1016/j.indcrop.2017.05.039

Cited by 144 publications

(106 citation statements)

References 49 publications

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“…Thereby, the smallest cell sizes of the filled RPUF (i.e., highest apparent density) did not promote enough heat transfer. The fillers probably blocked radiation heat transfer or acted as diffusion barriers , which attenuated thermal radiation via scattering or absorption processes. The changes in thermal conductivity can still be attributed to changes in cell shape and size and to the closed‐cells content , which are commonly modified by filler incorporation, as discussed above.…”

Section: Resultsmentioning

confidence: 99%

“…Rigid polyurethane foams (RPUFs) with a high amount of renewable resources have been receiving great attention due to the positive environmental impact related to the substitution of petroleum based‐materials. In fact, interesting mechanical and thermal performances have already been reported for the so‐called bio‐based RPUF, especially using polyester polyols based on vegetable oils , chemical additives based on glycerin from plant sources , and natural fiber or particles as fillers .…”

Section: Introductionmentioning

confidence: 99%

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Thermal and combustion features of rigid polyurethane biofoams filled with four forest‐based wastes

Delucis

Magalhães²,

Petzhold³

et al. 2018

Polymer Composites

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In this study, four fillers from forest‐based wastes were studied using thermogravimetry and contact angle measurements, and their compatibility with polyurethane were investigated by infrared spectroscopy performed in induced reaction mixtures, wherein the fillers were tested in the presence of excess isocyanate and catalyst. The fillers were then incorporated into rigid bio‐based polyurethane foams (RPUFs), which were characterized using thermal and combustion analyses. Wood presented higher compatibility with the polyurethane system, leading to a copolymer formation comprised by urethane groups during its polymerization. Filled RPUF reached increased thermal and dimensional stabilities, and similar thermal conductivities and flammabilities compared with the neat RPUF. POLYM. COMPOS., 39:E1770–E1777, 2018. © 2018 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal and combustion features of rigid polyurethane biofoams filled with four forest‐based wastes

Delucis

Magalhães²,

Petzhold³

et al. 2018

Polymer Composites

View full text Add to dashboard Cite

show abstract

“…In a recent study by Gimenez et al ., it was found that the development of RPUFs from bacterial nanocellulose (BNC) may result in a relevant increase in its specific mechanical properties. Several studies have also emphasized that the use of nanostructured foams could improve the specific mechanical properties of the material . In this regard, nanocellulose is a promising candidate in the development of sustainable, nontoxic, and low density RPUFs with enhanced mechanical properties .…”

Section: Introductionmentioning

confidence: 99%

Compressive behavior of rigid polyurethane foams nanostructured with bacterial nanocellulose at low and intermediate strain rates

Chiacchiarelli

Cerrutti

Flores‐Johnson

2019

J of Applied Polymer Sci

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Nanocellulose reinforced foams are lightweight with improved mechanical properties; however, the strain‐rate effect on their mechanical response is not yet fully understood. In this work, rigid polyurethane foams (PUFs) nanostructured with bacterial nanocellulose at 0.2 wt % (BNCF) and without it (PUF) are synthesized and subjected to compression tests at different strain rates. The BNC acts as a nucleation agent, reducing the cell size but maintaining a similar apparent density of 40.4 ± 3.3 kg m−3. Both BNCF and PUF exhibit strain‐rate effect on yield stress and densification strain. The BNCF exhibits localized progressive crushing and reduced friability, causing a remarkable recovery in the transverse direction. Numerical simulations show that functionally graded foams subjected to impact could be designed using different layers of PUF and BNCF to vary energy absorption and acceleration rate. The results presented herein warrant further research of the mechanical properties of nanostructured foams for impact applications. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 137, 48701.

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“…At an appropriate proportion, foaming agent A primarily composed of polyhydric alcohols and foaming agent B containing ─NCO have a chemical reaction and release carbon dioxide (bubbles) . Notably, rigid PU foam materials have been commonly used as insulating materials due to their good mechanical property, chemical stability, thermal insulation, and acoustic absorption. Rigid PU foam has a honeycomb structure, which easily collects air, and thus has a lower thermal conductivity coefficient and a cell size of one‐tenth that of nonfoaming material.…”

Section: Introductionmentioning

confidence: 99%

Mechanical, acoustic, and thermal performances of shear thickening fluid–filled rigid polyurethane foam composites: Effects of content of shear thickening fluid and particle size of silica

Ling

Wang

et al. 2019

J of Applied Polymer Sci

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Shear thickening fluid (STF) features a rheological property, and rigid polyurethane (PU) foams feature low thermal conductivity and excellent acoustic insulation. In this study, an STF/PU rigid foam composite sandwich structure was designed using different contents (0, 0.5, 1, or 1.5 wt %) of STF that contained 14 nm, 40 nm, or 75 nm silicon dioxide (SiO2). The effects of STF content and silica size on the cell structure, mechanical performance, acoustic absorption, and thermal performance of the STF/PU foam were explored. The test results show that STF/PU foam exhibited three characteristic acoustic absorption peaks, and the maximum acoustic absorption coefficient reached 0.841. STF addition increased compression, bending strength, and maximum acoustic coefficient, as well as initial mass loss temperature. STF‐filled PU foam composites containing 14 nm and 40 nm SiO2 had a mild rise in thermal insulation. The rigid STF/PU foam composites with a cell structure had the maximum thermal conductivity of 0.22 W m−1 K−1 and sound absorption coefficient of 0.841, which confirm that they are a good candidate for sound‐absorbing energy conservation materials. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47359.

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The use of cellulose nanocrystals to enhance the thermal insulation properties and sustainability of rigid polyurethane foam

Cited by 144 publications

References 49 publications

Thermal and combustion features of rigid polyurethane biofoams filled with four forest‐based wastes

Thermal and combustion features of rigid polyurethane biofoams filled with four forest‐based wastes

Compressive behavior of rigid polyurethane foams nanostructured with bacterial nanocellulose at low and intermediate strain rates

Mechanical, acoustic, and thermal performances of shear thickening fluid–filled rigid polyurethane foam composites: Effects of content of shear thickening fluid and particle size of silica

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