Investigation of epoxidation of used cooking oils with homogeneous and heterogeneous catalysts

Kurańska, Maria; Beneš, Hynek; Prociak, Aleksander; Trhlíková, Olga; Walterová, Zuzana; Stochlińska, Wioletta

doi:10.1016/j.jclepro.2019.117615

Cited by 57 publications

(34 citation statements)

References 29 publications

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“…The main findings are presented in Table 5. (mainly urea groups) [97][98][99]. Based on the results, it can be concluded that the addition of chemically-treated fibers improves the thermal stability of the obtained foams.…”

Section: Thermogravimetric Analysis Of Polyurethane Foamsmentioning

confidence: 83%

Effects of Chemically Treated Eucalyptus Fibers on Mechanical, Thermal and Insulating Properties of Polyurethane Composite Foams

et al. 2020

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In this work, rigid polyurethane (PUR) foams were prepared by incorporating 2 wt% of eucalyptus fibers. The eucalyptus fibers were surface-modified by maleic anhydride, alkali, and silane (triphenylsilanol) treatment. The impact of the modified eucalyptus fibers on the mechanical, thermal, and fire performances of polyurethane foams was analyzed. It was observed that the addition of eucalyptus fibers showed improved mechanical and thermal properties and the best properties were shown by silane-treated fibers with a compressive strength of 312 kPa and a flexural strength of 432 kPa. Moreover, the thermal stability values showed the lowest decline for polyurethane foams modified with the silane-treated fibers, due to the better thermal stability of such modified fibers. Furthermore, the flame resistance of polyurethane foams modified with the silane-treated fibers was also the best among the studied composites. A cone calorimetry test showed a decrease in the peak of heat release from 245 to 110 kW∙m−2 by the incorporation of silane-treated fibers. Furthermore, total heat release and total smoke release were also found to decrease remarkably upon the incorporation of silane-treated fibers. The value of limiting oxygen index was increased from 20.2% to 22.1%. Char residue was also found to be increased from 24.4% to 28.3%. It can be concluded that the application of chemically modified eucalyptus fibers has great potential as an additive to incorporate good mechanical, thermal, and fire properties in rigid polyurethane foams.

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Section: Thermogravimetric Analysis Of Polyurethane Foamsmentioning

confidence: 83%

Effects of Chemically Treated Eucalyptus Fibers on Mechanical, Thermal and Insulating Properties of Polyurethane Composite Foams

et al. 2020

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“…The first stage of decomposition (T max1 ) occurred in the range of 200–230 °C and referred to the moisture absorption of cellulosic filler [ 57 , 58 , 59 , 60 ] and decomposition of the urethane bond [ 57 , 58 ]. The second stage (T max2 ) of the PUR-composite decomposition occurred in the range of 300–350 °C, and should be assigned to the thermal pyrolysis of hard segments of PUR, which resulted in the formation of alcohol and isocyanate groups [ 61 , 62 , 63 ]. When compared with PUR_NEAT, T max2 increased on the addition of 1 and 2 wt % of coir-fiber filler—the value of T max2 increased from 312 °C (for PUR_NEAT) to 320 and 319 °C, respectively.…”

Section: Resultsmentioning

confidence: 99%

Coir Fibers Treated with Henna as a Potential Reinforcing Filler in the Synthesis of Polyurethane Composites

2021

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In this study, coir fibers were successfully modified with henna (derived from the Lawsonia inermis plant) using a high-energy ball-milling process. In the next step, such developed filler was used as a reinforcing filler in the production of rigid polyurethane (PUR) foams. The impact of 1, 2, and 5 wt % of coir-fiber filler on structural and physico-mechanical properties was evaluated. Among all modified series of PUR composites, the greatest improvement in physico-mechanical performances was observed for PUR composites reinforced with 1 wt % of the coir-fiber filler. For example, on the addition of 1 wt % of coir-fiber filler, the compression strength was improved by 23%, while the flexural strength increased by 9%. Similar dependence was observed in the case of dynamic-mechanical properties—on the addition of 1 wt % of the filler, the value of glass transition temperature increased from 149 °C to 178 °C, while the value of storage modulus increased by ~80%. It was found that PUR composites reinforced with coir-fiber filler were characterized by better mechanical performances after the UV-aging.

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“…Bio-polyol with a hydroxyl number of 270 mgKOH/g was synthesized from used cooking oil at Cracow University of Technology according to the method described in our earlier publications [ 9 , 16 ]. A petrochemical polyether polyol with the trade name Rokopol RF-551 and a hydroxyl number of 440 mgKOH/g was supplied by PCC Rokita (Brzeg Dolny, Poland).…”

Section: Methodsmentioning

confidence: 99%

Thermal Insulation and Sound Absorption Properties of Open-Cell Polyurethane Foams Modified with Bio-Polyol Based on Used Cooking Oil

Kurańska

Barczewski

et al. 2020

Materials

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The main goal of this work was to evaluate the thermal insulation and sound absorption properties of open-cell rigid polyurethane foams synthesized with different contents of cooking oil-based polyol. The content of the applied bio-polyol as well as flame retardant (triethyl phosphate) in the foam formulation had a significant influence on the cellular structures of the materials. The open-cell polyurethane foams were characterized by apparent densities in the range 16–30 kg/m3. The sound absorption coefficients of the polyurethanes with various contents of bio-polyol were determined using the standing wave method (Kundt’s tube) in the frequency range of 100–6300 Hz. The effect of the content of the bio-polyol and flame retardant on the coefficient of thermal conductivity (at average temperatures of 0, 10 and 20 °C) as well as the compressive strength (at 20 and −10 °C) was analyzed. Different trends were observed in terms of the thermal insulation properties and sound absorption ability of the open-cell polyurethanes due to the addition of bio-polyol. In conclusion, it is necessary to use systems containing both petrochemical and bio-based raw materials.

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Investigation of epoxidation of used cooking oils with homogeneous and heterogeneous catalysts

Cited by 57 publications

References 29 publications

Effects of Chemically Treated Eucalyptus Fibers on Mechanical, Thermal and Insulating Properties of Polyurethane Composite Foams

Effects of Chemically Treated Eucalyptus Fibers on Mechanical, Thermal and Insulating Properties of Polyurethane Composite Foams

Coir Fibers Treated with Henna as a Potential Reinforcing Filler in the Synthesis of Polyurethane Composites

Thermal Insulation and Sound Absorption Properties of Open-Cell Polyurethane Foams Modified with Bio-Polyol Based on Used Cooking Oil

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