Improving the oil sorption capability of porous polyurethane composites by the incorporation of cellulose fibers extracted from water hyacinth

Sittinun, Apichet; Pisitsak, Penwisa; Ummartyotin, S.

doi:10.1016/j.coco.2020.04.017

Cited by 22 publications

(8 citation statements)

References 15 publications

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“…The difference in water absorption and the change with the addition of PURb can be explained by the fact that at 0.85 PURb/WS, the WS particles are distributed in a higher volume, therefore, the hydrophobic matrix makes it harder for water to interact with WW-based filler, thus reducing the short-term water absorption by partial immersion values. This phenomenon has also been reported by other authors [ 59 , 60 ] who tested 24 h water immersion of pre-hydrolysed banana fibres-based polyurethane foam composites, and the contact angle of porous polyurethane filled with cellulose fibres from water hyacinth, respectively. Water vapour resistance is dependent on the thickness of the sample.…”

Section: Resultssupporting

confidence: 87%

Research of Wood Waste as a Potential Filler for Loose-Fill Building Insulation: Appropriate Selection and Incorporation into Polyurethane Biocomposite Foams

et al. 2020

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Currently, the recycling potential of wood waste (WW) is still limited, and in a resource efficiency approach, recycling WW in insulation materials, such as polyurethane (PUR), appears as an appropriate solution. It is known that the quality of WW is the main aspect which influences the stability of the final products. Therefore, the current study analyses different WW-based fillers as possible modifiers for polyurethane biocomposite foams for the application as loose-fill materials in building envelopes. During the study of WW-based fillers, it was determined that the most promising filler is wood scobs (WS) with a thermal conductivity of 0.0496 W/m·K, short-term water absorption by partial immersion—12.5 kg/m2, water vapour resistance—0.34 m2·h·Pa/mg and water vapour diffusion resistance factor—2.4. In order to evaluate the WS performance as a filler in PUR biocomposite foams, different ratios of PUR binder and WS filler (PURb/WS) were selected. It was found that a 0.40 PURb/WS ratio is insufficient for the appropriate wetting of WS filler while a 0.70 PURb/WS ratio produced PUR biocomposite foams with the most suitable performance: thermal conductivity reduced from 0.0523 to 0.0476 W/m·K, water absorption—from 5.6 to 1.3 kg/m2, while the compressive strength increased from 142 to 272 kPa and the tensile strength increased from 44 to 272 kPa.

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Section: Resultssupporting

confidence: 87%

Research of Wood Waste as a Potential Filler for Loose-Fill Building Insulation: Appropriate Selection and Incorporation into Polyurethane Biocomposite Foams

et al. 2020

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“…The morphological structure of the produced foam samples is reported in Figure 6 . The microstructure of semi-rigid foams [ 46 ] with a partially opened structure [ 47 ] is observed. The SEM micrographs highlight that the PU-Reference ( Figure 6 a) shows a cell dimension ranging around 400–300 µm, while the addition of the grafted CNC affects the dimension of the cell foams and the interconnection as well.…”

Section: Resultsmentioning

confidence: 99%

Chemically Functionalized Cellulose Nanocrystals as Reactive Filler in Bio-Based Polyurethane Foams

et al. 2021

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Cellulose Nanocrystals, CNC, opportunely functionalized are proposed as reactive fillers in bio-based flexible polyurethane foams to improve, mainly, their mechanical properties. To overcome the cellulose hydrophilicity, CNC was functionalized on its surface by linking covalently a suitable bio-based polyol to obtain a grafted-CNC. The polyols grafted with CNC will react with the isocyanate in the preparation of the polyurethane foams. An attractive way to introduce functionalities on cellulose surfaces in aqueous media is silane chemistry by using functional trialkoxy silanes, X-Si (OR)3. Here, we report the synthesis of CNC-grafted-biopolyol to be used as a successful reactive filler in bio-based polyurethane foams, PUFs. The alkyl silanes were used as efficient coupling agents for the grafting of CNC and bio-polyols. Four strategies to obtain CNC-grafted-polyol were fine-tuned to use CNC as an active filler in PUFs. The effective grafting of the bio polyol on CNC was evaluated by FTIR analysis, and the amount of grafted polyol by thermogravimetric analysis. Finally, the morphological, thermal and mechanical properties and hydrophobicity of filled PUFs were thoughtfully assessed as well as the structure of the foams and, in particular, of the edges and walls of the cell foams by means of the Gibson–Ashby model. Improved thermal stability and mechanical properties of PU foams containing CNC-functionalized-polyol are observed. The morphology of the PU foams is also influenced by the functionalization of the CNC.

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“…Moreover, the addition of AR increased the hydrophobic character for PU/X%AR (when PU/20%AR had the higher CA = 122.5 ± 4.8°) compared to pristine PU (99.0 ± 11.0°) as seen in Figure 3(b), possibly further increasing surface selectivity (water repulsion and foam interaction with oily residues). Some researchers evidenced an opposite effect, the increase in wettability with the insertion of natural fibers due to their hydrophilic nature 39,66,67 . A factor that may explain the increase in CA with AR may be the sample surface's irregularity promoted by the residue (probably due to the increase of porosity).…”

Section: Resultsmentioning

confidence: 99%

“…These biomass wastes are low‐cost and contribute to minimizing the environmental problems caused by the disposal of vegetable oil 2 . The literature has reported several studies about the reinforcement in PU with biomass wastes for synthesizing high‐performance adsorbent such as waste paper, 35 kenaf fibers, 36 lignin, 37 orange peel, 38 sugarcane bagasse, 2 cellulose fibers, 39 and wood fibers 40 . Among the natural fibers, the ARs are highlighted.…”

Section: Introductionmentioning

confidence: 99%

Eco‐friendly foams of castor oil based‐polyurethane with Artemisia residue fillers for discarded vegetable oil sorption

Maia

Zanini

Claro

et al. 2021

J of Applied Polymer Sci

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In this article, a new approach is applied to reuse Artemisia residue (AR) as filler in polyurethane (PU) foam for vegetable oil sorption for discarded cooking oil applications. The pristine PU and PU/X%AR foams (X stands for AR content of 5–20%wt/wt) were characterized by SEM, density, contact angle (CA), thermogravimetric analysis, and Fourier transform infrared spectroscopy. The influence of two experimental factors, such as contact time (30–180 s) and initial vegetable oil concentration (20–200 g/L), was investigated in vegetable oil and vegetable oil/mineral water systems. The AR loading of the foams increased the foams' density and influenced the morphological, physical, thermal, and sorption properties. The PU/20%AR sample presented the highest CA (122.5°) and the best sorption capacity and efficiency in both systems due to the small pores size and higher frequency of pores. Langmuir and Freundlich isotherm models well defined the sorption mechanisms. The Langmuir model represented the best fit of experimental data for PU/20%AR with a maximum adsorption capacity of 16.86 g/g. The PU/20%AR presented reusability of 7 cycles, conserving their hydrophobicity after the process. Therefore, AR is an innovative route as fillers in PU foams for discarded vegetable oil sorption, and the circular economy can benefit from the reuse of discarded vegetable cooking oil.

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Improving the oil sorption capability of porous polyurethane composites by the incorporation of cellulose fibers extracted from water hyacinth

Cited by 22 publications

References 15 publications

Research of Wood Waste as a Potential Filler for Loose-Fill Building Insulation: Appropriate Selection and Incorporation into Polyurethane Biocomposite Foams

Research of Wood Waste as a Potential Filler for Loose-Fill Building Insulation: Appropriate Selection and Incorporation into Polyurethane Biocomposite Foams

Chemically Functionalized Cellulose Nanocrystals as Reactive Filler in Bio-Based Polyurethane Foams

Eco‐friendly foams of castor oil based‐polyurethane with Artemisia residue fillers for discarded vegetable oil sorption

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