Influence of the chemical structure of rapeseed oil-based polyols on selected properties of polyurethane foams

Uram, Katarzyna; Prociak, Aleksander; Kurańska, Maria

doi:10.14314/polimery.2020.10.5

Cited by 13 publications

(28 citation statements)

References 28 publications

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“…The use of the mixture of the bio-polyols caused a decrease of the reactivity of the modified systems, which was confirmed by a lower maximum temperature during the foaming process. The maximum temperature of the system in which 40 wt.% of the petrochemical polyol had been replaced with the mixture of the bio-polyols was 160 • C. For a suitable system modified only with bio-polyol P_1Hex, the temperature was 159 • C [24]. Regardless of the content of the bio-polyol mixture, no differences in the changes of the dielectric polarizations were observed.…”

Section: Resultsmentioning

confidence: 97%

“…The maximum temperature of the system in which 40 wt.% of the petrochemical polyol had been replaced with the mixture of the bio-polyols was 160 °C. For a suitable system modified only with bio-polyol P_1Hex, the temperature was 159 °C [24]. Regardless of the content of the bio-polyol mixture, no differences in the changes of the dielectric polarizations were observed.…”

Section: Resultsmentioning

confidence: 99%

“…Next, the epoxidized oil was added. The mixture was heated to 100 • C. The reaction was carried out until the epoxy value of the whole mixture was 0 mol/100 g. A detailed description of the synthesis of the bio-polyols was presented in our earlier work [24]. Characteristics of the bio-polyols and petrochemical polyol are shown in Table 1.…”

Section: Foam Formulation and Preparationmentioning

confidence: 99%

“…In a previous study, Uram et al [24] developed a bio-polyol synthesis by epoxidation of rapeseed oil and opening of oxirane rings with 1-hexanol and 1,6-hexanediol in order to obtain bio-polyols with different functionalities and components with primary and secondary hydroxyl groups. The hydroxyl number of the bio-polyol obtained with 1.6-hexanediol was more than twice as high as that of the bio-polyol obtained with 1-hexanol and the viscosity was almost eight times higher.…”

Section: Introductionmentioning

confidence: 99%

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Bio-Polyurethane Foams Modified with a Mixture of Bio-Polyols of Different Chemical Structures

et al. 2021

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We report on rigid polyurethane (PUR) foams prepared using different contents of a mixture of two bio-polyols (20–40 php). The bio-polyols were obtained through epoxidation and a ring opening reaction. Different chemical structures of the bio-polyols resulted from the use of 1-hexanol and 1,6-hexanediol as opening agents. The bio-polyols were characterized by hydroxyl values of 104 and 250 mgKOH/g and viscosities of 643 and 5128 mPa·s, respectively. Next, the influence of the bio-polyols on the foaming process of PUR systems as well as the foam properties was evaluated. The bio-foams modified with different contents of the bio-polyols were next compared with a reference foam obtained using a polyether petrochemical polyol. The effect of the apparent density reduction as a result of replacing the petrochemical polyol was minimized by decreasing the water content in the formulation. It was found that the modification of the recipe by changing the content of water, acting as a chemical foaming agent, did not affect the foaming process. However, the introduction of the bio-polyols mixture limited the reactivity of the systems by reducing the maximum temperature of the foaming process. The bio-materials with comparable apparent densities to that of the reference material were characterized by similar values of the thermal conductivity coefficient and a decrease in their mechanical strengths. A deterioration of mechanical properties was caused by the plasticization of the polyurethane matrices with the bio-polyols containing dangling chains. However, all materials were dimensionally stable at room temperature.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Foam Formulation and Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bio-Polyurethane Foams Modified with a Mixture of Bio-Polyols of Different Chemical Structures

et al. 2021

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“…The weight ratio of used bio-polyols was 1:1. The detailed procedure for obtaining bio-polyols was described in the previous work [30]. The characteristics of the polyols used are shown in Table 1.…”

Section: Methodsmentioning

confidence: 99%

Polyurethane Composite Foams Synthesized Using Bio-Polyols and Cellulose Filler

et al. 2021

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Rigid polyurethane foams were obtained using two types of renewable raw materials: bio-polyols and a cellulose filler (ARBOCEL® P 4000 X, JRS Rettenmaier, Rosenberg, Germany). A polyurethane system containing 40 wt.% of rapeseed oil-based polyols was modified with the cellulose filler in amounts of 1, 2, and 3 php (per hundred polyols). The cellulose was incorporated into the polyol premix as filler dispersion in a petrochemical polyol made using calenders. The cellulose filler was examined in terms of the degree of crystallinity using the powder X-ray diffraction PXRD -and the presence of bonds by means of the fourier transform infrared spectroscopy FT-IR. It was found that the addition of the cellulose filler increased the number of cells in the foams in both cross-sections—parallel and perpendicular to the direction of the foam growth—while reducing the sizes of those cells. Additionally, the foams had closed cell contents of more than 90% and initial thermal conductivity coefficients of 24.8 mW/m∙K. The insulation materials were dimensionally stable, especially at temperatures close to 0 °C, which qualifies them for use as insulation at low temperatures.

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Bio‐polyols synthesized by liquefaction of cellulose: Influence of liquefaction solvent molecular weight

Olszewski

Kosmela

Piszczyk

2023

J of Applied Polymer Sci

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Currently, the plastics industry including polyurethanes is based on the use of petrochemicals. For this reason, scientists are looking for new types of renewable resources for the substitution of petrochemical substances. This work aims to evaluate the effect of polyethylene glycols (PEG) with different molecular mass impact on properties of bio-based polyols synthesized via biomass liquefaction of cellulose. To date, research has mostly focused on the use of different biomass sources, but the area of bio-polyols synthesis with PEG with various molecular weights has not been explored in depth. For this reason, polyols were synthesized using PEG with a molecular weight in the range of 200-600 g/mol. Depending on the type of liquefaction solvent, the bio-polyols showed a hydroxyl value of 519-652 mgKOH/g, a viscosity of 0.736-1.415 PaÁs, and a water content below 1%. Observed difference may be related to change of reactivity of the PEG chains caused by steric hindrance of longer chains and the difference in the amount of reactive OH groups. These findings add substantially to understanding of the influence of liquefaction solvent molecular mass on the properties of new bio-polyols and those of polyurethane materials.

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Influence of the chemical structure of rapeseed oil-based polyols on selected properties of polyurethane foams

Cited by 13 publications

References 28 publications

Bio-Polyurethane Foams Modified with a Mixture of Bio-Polyols of Different Chemical Structures

Bio-Polyurethane Foams Modified with a Mixture of Bio-Polyols of Different Chemical Structures

Polyurethane Composite Foams Synthesized Using Bio-Polyols and Cellulose Filler

Bio‐polyols synthesized by liquefaction of cellulose: Influence of liquefaction solvent molecular weight

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