Production and characterization of polyurethane foams from a simple mixture of castor oil, crude glycerol and untreated lignin as bio-based polyols

Carriço, Camila Santana; Fraga, Thaís; Pasa, Vânya Márcia Duarte

doi:10.1016/j.eurpolymj.2016.10.012

Cited by 132 publications

(99 citation statements)

References 19 publications

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“…The effect of the blowing agent type in apparent density of the foams produced from GCo polyols (Table 1) showed that formulations with physical blowing agents (cyclopentane and n-pentane) produced foams with higher densities than those synthesized with the chemical blowing agent (water). Similar results have been reported in the literature [34][35][36] and this behaviour indicates that smaller cells are formed due to the rapid volatilization of physical blowing agents, which have low boiling point, during the highly exothermic foam growth step in comparison with the CO2, produced by the reaction of water with isocyanate [37]. The effect of blowing agent (water) content in the foams apparent density was also evaluated, as showed in Figure 5a.…”

Section: Resultssupporting

confidence: 70%

“…The different foams presented similar thermal stability and DTG curves showed three regions of weight loss. The first event (around 300°C) correspond to urethane thermal degradation, free isocyanate and alcohols; the second event was related with the degradation of rigid segments, at 370°C; and the third event, approximately at 480°C, is associated to the thermal degradation of flexible segments and others segments of the remaining structure [33,34]. The effect of different blowing agents in thermal stability of the GCo foams was evaluated as showed in Figures 4a and 4b.…”

Section: Resultsmentioning

confidence: 99%

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Polyurethane Foams for Thermal Insulation Uses Produced from Castor Oil and Crude Glycerol Biopolyols

Carriço¹,

Fraga²,

Carvalho³

et al. 2017

Preprint

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Rigid polyurethane foams were synthesized using a renewable polyol from the simple physical mixture of castor oil and crude glycerol. The effect of the catalyst and blowing agent in the foams properties was evaluated. The use of physical blowing agent (cyclopentane and n-pentane) allowed obtaining foams with smaller cells in comparison with the foams produced with a chemical blowing agent (water). The increase of water content caused a decrease of density, thermal conductivity, compressive strength and Young's modulus, which indicates that the increment of CO2 production contributes to the formation of larger cells. Higher amount of catalyst in the foam formulations caused a slight density decrease and an increase small significance of thermal conductivity, compressive strength and Young's modulus values. These green foams presented properties that indicate a great potential to be used as thermal insulation, as density (23 -41 kg m -3 ), thermal conductivity (0.0128 -0.0207 W m -1 K -1 ), compressive strength (45 -188 kPa) and Young's modulus (3 -28 kPa). These biofoams are also environmental friendly alternatives and can aggregate revenue to biodiesel industry, contributing for reduction of this fuel prices.

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Section: Resultssupporting

confidence: 70%

Section: Resultsmentioning

confidence: 99%

Polyurethane Foams for Thermal Insulation Uses Produced from Castor Oil and Crude Glycerol Biopolyols

Carriço¹,

Fraga²,

Carvalho³

et al. 2017

Preprint

Self Cite

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“…CH asymmetric and symmetric stretching vibration of CH 2 appear at 2945 and 2851 cm −1 , respectively . Other CH vibrational modes could be observed at 1413 and 1309 cm −1 . The absorption peaks at 1219, 1101, and 1056 cm −1 are resulted from the presence of COC …”

Section: Resultsmentioning

confidence: 91%

Synthesis and properties of polyurethane elastomers based on renewable castor oil polyols

Zhang

Yao

Chen

et al. 2018

J of Applied Polymer Sci

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In this contribution, castor oil polyols with functionality of f = 2.7 and f = 2 are used as soft segments (SS) for synthesizing polyurethane elastomers (PUEs) without addition of petroleum‐based polyol. The effect of molar ratio of castor oil polyols on structure and properties of PUEs has been investigated by Fourier transform infrared spectroscopy, differential scanning calorimetry, thermogravimetric analysis, dynamic mechanical analysis, X‐ray diffraction, tensile, swelling, and water absorption tests. The results reveal that hydrogen bonding mainly exists in hard segments (HSs) and weakens with decreasing the molar percentage of castor oil polyol (f = 2.7) in SS. T g of SS decreases while T g of HS remains constant as molar percentage of castor oil polyol (f = 2.7) decreased. The initial degradation temperatures (T5%) are above 300 °C and independent of the molar ratio of castor oil polyols. However, the temperature at 50% weight loss (T50%) decreases significantly as molar percentage of castor oil polyol (f = 2.7) decreased. Moreover, PUEs exhibit very low water absorption rate, <1%, after immersing in water for 140 h at room temperature. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47309.

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“…The actual trends of green chemistry are connected with the replacing of petrochemical-based chemicals by bio-based and renewable feedstock. The increasing interest in the area of bio-based substances (e.g., polyols [1,2,15,16], chain extenders [17][18][19][20] and diisocyanates [21,22]) used as a components in the synthesis of polyurethanes is observed. According to the literature, the non-isocyanates polyurethanes synthesized using natural resources (e.g., vegetable oils, bio-based diamines, fatty acids and glycerol) are also known [23,24].…”

Section: Introductionmentioning

confidence: 99%

“…PUs can be obtained as a foams [1], elastomers [2,3], thermoplastics [4], coatings [5], as well as fibers [6,7]. It is also possible to use polyurethanes as a component for preparing polymer composites [8] or blends [9,10].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, structure and properties of poly(ester-urethane)s obtained using bio-based and petrochemical 1,3-propanediol and 1,4-butanediol

Datta

Kasprzyk

Błażek

et al. 2017

J Therm Anal Calorim

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In this paper, the poly(ester-urethane)s obtained using petrochemical and bio-based chain extenders were prepared and characterized. The influence of glycols' origin on the chemical structure, mechanical and thermal properties of the prepared polyurethanes was studied. The materials were synthesized by prepolymer method. The first step involved the reaction of a,x-dihydroxy(ethylenebutylene adipate) (POLIOS 55/20) with 4,4 0 -diphenylmethane diisocyanate (MDI). In the next step, obtained prepolymer terminated with isocyanate group was extended using 1,3-propanediol and 1,4-butanediol at three different molar ratios of NCO group (presented in prepolymer chains) to OH groups (presented in chain extender structure), i.e., 0.95, 1.0 and 1.05. The results showed that applying the different types (diversified chemical structure and origin) of glycols results in obtaining materials with diversified mechanical properties and slight different thermal stabilities. The results of Fourier transform infrared spectroscopy showed that the chemical structure of the obtained polyurethanes was not affected by the presence of glycols with the same chemical structure and different origins (petrochemical and bio-based nature).

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Production and characterization of polyurethane foams from a simple mixture of castor oil, crude glycerol and untreated lignin as bio-based polyols

Cited by 132 publications

References 19 publications

Polyurethane Foams for Thermal Insulation Uses Produced from Castor Oil and Crude Glycerol Biopolyols

Polyurethane Foams for Thermal Insulation Uses Produced from Castor Oil and Crude Glycerol Biopolyols

Synthesis and properties of polyurethane elastomers based on renewable castor oil polyols

Synthesis, structure and properties of poly(ester-urethane)s obtained using bio-based and petrochemical 1,3-propanediol and 1,4-butanediol

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