Improvement in physico-mechanical and structural properties of rigid polyurethane foam composites by the addition of sugar beet pulp as a reactive filler

Akdoğan, Emre; Erdem, Murat

doi:10.1007/s10965-021-02445-w

Cited by 17 publications

(13 citation statements)

References 68 publications

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“…The SEM micrographs ( Figure 4 ) also suggest a good chemical affinity of the fillers in the RPUF cellular structure since no agglomerates were founded. Similar behaviors have been found in the literature for other chemically compatible fillers, such as fillers based on different polysaccharides [ 5 , 11 , 25 ]. These later PU systems again seem to be affected by urethane linkages between NCO groups from the p-MDI and OH groups from the bergamot peel.…”

Section: Resultssupporting

confidence: 87%

“…Considering that these fillers presented high volatile matter contents, more prone to be released at lower temperatures, the higher T2% values were attributed to their partial crosslinking with the NCO groups. Furthermore, the filled RPUF presented slower initial thermal degradation than the neat one in all cases, with T5% in the 95–250 °C range, which is also probably due to filler/RPUF crosslinking since this temperature range is related to the breaking of urethane linkages [ 5 , 28 ]. In applications such as building flat roofing sealed with bituminous roof covering, RPUF must withstand temperatures up to 250 °C for short periods without showing adverse effects [ 17 ].…”

Section: Resultsmentioning

confidence: 99%

“…They present similar properties if compared to some other traditional insulation materials, such as expanded polystyrene, extruded polystyrene, porous concrete, cork tile, and mineral wool [ 4 ]. Although the thermal insulation properties of RPUF are better than lots of insulation materials, the use of RPUF is sometimes not preferred in some applications because of their high cost [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

“…These vegetable resources provide a higher cost benefit compared to synthetic fibers and also represent an increase in sustainable appeal [ 11 ]. The main advantages conferred by the introduction of natural fillers into RPUF include increases in thermal, mechanical, and hygroscopic properties and biodegradability, as well as decreases in consumption of oil-based raw materials, emissions of greenhouse gas, and production costs [ 5 ]. Most of these improvements in technological properties imparted by bio-based fillers are associated with the presence of free hydroxyl (OH) groups on their surface, which are prone to form urethane linkages with isocyanate (NCO) groups from the PU backbone [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

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Rigid Polyurethane Biofoams Filled with Chemically Compatible Fruit Peels

et al. 2022

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Banana and bergamot peels are underutilized byproducts of the essential oil and juice-processing industry. This study was designed for the development of rigid polyurethane foam (RPUF) composites using polysaccharide-rich fruit peels as fillers. These fillers were characterized for chemical properties using wet analyses. Additionally, the influences of the filler type and filler content on morphological, thermal, mechanical, hygroscopic, and colorimetric properties of the RPUF were investigated. The main results indicated that, in a comparison with the neat RPUF, the insertion of up to 15% of fillers yielded similar water uptake, apparent density, compressive strength, and color properties, as well as increases up to 115% in thermal stability and up to 80% in cell size.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Rigid Polyurethane Biofoams Filled with Chemically Compatible Fruit Peels

et al. 2022

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“…SEM was a usually method to investigate morphology of char residue 39,40 . Figure 7 gave the SEM images of carbon slags of RPUF and FR‐RPUF.…”

Section: Resultsmentioning

confidence: 99%

Fire retarded polyurethane foam composites based on steel slag/ammonium polyphosphate system: A novel strategy for utilization of metallurgical solid waste

Yang

Liu

Tang

et al. 2021

Polymers for Advanced Techs

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A series of FR‐RPUF composites were prepared by a one‐step water foaming process with ammonium polyphosphate (APP) and steel slag (SS) as flame retardants. Thermogravimetric analysis (TG), limiting oxygen index (LOI), UL‐94 vertical combustion test, microscale combustion calorimetry (MCC), TG‐Fourier transform infrared spectrometry (TG‐FTIR), scanning electron microscopy (SEM), Raman spectra and FTIR were used to investigate the thermal stability, flame retardancy, combustion performance, gas phase products, and char residue morphology of FR‐RPUF composites. TG test results showed that the initial decomposition temperature (T‐5wt%) and char residue rate at 700°C of RPUF/APP/SS composites were significantly enhanced by the addition of APP and SS, and the thermal stability of the composites was improved. Flame retardant test results confirmed the significantly increased LOI values of RPUF/APP/SS composites with V‐0 rating. TG‐FTIR also confirmed the obviously decreased release of toxic gases and flammable gases in the combustion of RPUF/APP/SS composites. SEM and Raman spectra of char residues for the composites suggested that APP/SS system improved the compactness and graphitization degree of char layer for RPUF/APP/SS composite. The above researches provide a new strategy for the utilization of SS in fire safety engineering.

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Effect of natural biomass fillers on the stability, degradability, and elasticity of crop straws liquefied polyols‐based polyurethane foams

Zhang

Hori

Takemura

2022

J of Applied Polymer Sci

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Oilseed rape straw (OS), rice straw (RS), wheat straw (WS), and corn stover (CS) particles were used to reinforce bio‐polyols based polyurethane (PU) foams. The influence of crop straws (XS) fillers on the stability in water, degradability in soil, thermal stability, and elasticity of foams were investigated. The incorporation of OS and CS particles in the PU matrix increased the stability of reinforced foams in water, while the addition of WS and RS particles made foams lower stability in water. PU foams reinforced by XS particles displayed mass reductions up to 53.8% after burying in soil for 250 days. The reinforced foams were more stable under heating but the enhancement of thermal stability trended to disappear after water immersion or soil burying. The reinforced foams showed better elasticity that incorporations of OS and CS made PU foams higher height recovery percentage, while RS and WS made the recovery percentage decline firstly and then enhance during three times compressions. All these four XS particles are suitable to modify bio‐based PU foams, especially OS and CS particles appear to be more outstanding in preparing foams with higher stability in water, degradability in soil, thermal stability, and elasticity than RS and WS particles.

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Improvement in physico-mechanical and structural properties of rigid polyurethane foam composites by the addition of sugar beet pulp as a reactive filler

Cited by 17 publications

References 68 publications

Rigid Polyurethane Biofoams Filled with Chemically Compatible Fruit Peels

Rigid Polyurethane Biofoams Filled with Chemically Compatible Fruit Peels

Fire retarded polyurethane foam composites based on steel slag/ammonium polyphosphate system: A novel strategy for utilization of metallurgical solid waste

Effect of natural biomass fillers on the stability, degradability, and elasticity of crop straws liquefied polyols‐based polyurethane foams

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