Polyols from recycled poly(ethylene terephthalate) flakes and rapeseed oil for polyurethane foams

Paberza, Aiga; Fridrihsone, Anda; Āboliņš, Arnis; Cābulis, Uģis

doi:10.14314/polimery.2015.572

Cited by 16 publications

(28 citation statements)

References 14 publications

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“…At mode where R.H. = 97%, volume change for RO/PET series is below 15% and reaches 3.4% when II = 180. Although RO/PET polyols show better compatibility with blowing agents [32], which could improve dimensional stability, it was not observed in the results of the present study. As the standard ISO 2796 gives various options for modes and test duration, it is quite difficult to compare our results with other investigations.…”

Section: Dimensional Stability and Water Absorptioncontrasting

confidence: 74%

“…Initial thermal conductivity of rigid PUR foams with apparent density 42 ± 3 kg/m 3 was measured, as well as thermal conductivity, after 24 weeks. The initial values are given in Figure 7a Although RO/PET polyols show better compatibility with blowing agents [32], which could improve dimensional stability, it was not observed in the results of the present study. As the standard ISO 2796 gives various options for modes and test duration, it is quite difficult to compare our results with other investigations.…”

Section: Thermal Conductivitymentioning

confidence: 51%

“…The series RO/TEA and RO/PET polyol systems were required to add less catalyst, as they showed higher reactivity. The higher reactivity was due to a tertiary amine group in the main polyol structure [32].…”

Section: Reactivity Of Foam Formationmentioning

confidence: 99%

“…Novel polyols are compatible with a physical blowing agent, less viscous, and more stable against crystallization. Therefore, these polyols are suitable for the preparation of rigid PUR foams [21,32,33].…”

Section: Introductionmentioning

confidence: 99%

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Rigid Polyurethane Foams with Various Isocyanate Indices Based on Polyols from Rapeseed Oil and Waste PET

et al. 2020

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Developing polyols derived from natural sources and recycling materials attracts great interest for use in replacing petroleum-based polyols in polyurethane production. In this study, rigid polyurethane (PUR) foams with various isocyanate indices were obtained from polyols based on rapeseed oil and polyethylene terephthalate (RO/PET). The various properties of the prepared PUR foams were investigated, and the effect of the isocyanate index was evaluated. The closed-cell content and water absorption were not impacted by the change of the isocyanate index. The most significant effect of increasing the isocyanate index was on the dimensional stability of the resulting foams. This is due to the increased crosslink density, as evidenced by the increased formation of isocyanurate and increase of the glass transition temperature. Additionally, the influence on compression strength, modulus, and long-term thermal conductivity were evaluated and compared with reference PUR foams from commercially available polyols. Rigid PUR foams from RO/PET polyol were found to be competitive with reference materials and could be used as thermal insulation material.

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Section: Dimensional Stability and Water Absorptioncontrasting

confidence: 74%

Section: Thermal Conductivitymentioning

confidence: 51%

Section: Reactivity Of Foam Formationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Rigid Polyurethane Foams with Various Isocyanate Indices Based on Polyols from Rapeseed Oil and Waste PET

et al. 2020

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“…Polyols that are reacted with different diisocyanates to obtain PUs, are derived mostly from petrochemical products but can be replaced by renewable materials. Therefore, polyurethanes have been synthesized from bio‐polyols derived from vegetable oils obtained from various plant seeds such as castor bean , cotton, rapeseed , jatropha, palm , soybean , and sunflower .…”

Section: Introductionmentioning

confidence: 99%

Composites made from a soybean oil biopolyurethane and cellulose nanocrystals

Mucci

Ivdre

Buffa

et al. 2017

Polymer Engineering & Sci

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Cellulose nanocrystals (CNC) obtained by acidic hydrolysis from microcrystalline cellulose were dispersed in a biopolyurethane matrix to prepare composite films. The polyurethane was prepared from a hydroxylated soybean oil (SO‐OH) and a polymeric diphenyldiisocyanate (pMDI), using a organotin compound as the catalyst. The composite films contained different concentrations of nanocelullose, without any macroscopic aggregates in all cases. Thermal, tensile and dynamic mechanical properties of the films were determined for all the samples. In particular, it was observed that the glass transition temperature of the nanocomposites slightly increased with the concentration of the cellulose nanocrystals. The nanocomposite with 1 wt% of nanocellulose showed the highest tensile strength of the series. POLYM. ENG. SCI., 58:125–132, 2018. © 2017 Society of Plastics Engineers

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Influence of Chemical Structure of Petrochemical Polyol on Properties of Bio-polyurethane Foams

Prociak

Szczepkowski²,

Ryszkowska

et al. 2019

J Polym Environ

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In this study, the influence of the chemical structures of petrochemical polyols on the foaming process of polyurethane compositions as well as on selected properties of the foams obtained has been investigated. Two types of petrochemical polyols were used-polyester and polyether polyols as well as their blends with a rapeseed oil-based polyol. Dielectric polarization, temperature and expansion velocity were determined during the foaming process of the polyurethane systems with different polyol components. The results show the highest reactivity of the polyester polyol and a decrease of the polyurethane system's reactivity as a result of a partial replacement of the petrochemical polyol with the bio-based polyol. The content of the closed cells in the materials obtained strongly depends on the petrochemical polyol used. The results indicate that the chemical structure of the petrochemical polyol had a significant effect on the cellular structure as well as the physicalmechanical properties of the final products. A significant worsening of the foams' mechanical properties was observed as an effect of a partial replacement of the polyester polyol with the rapeseed oil-based polyol. In contrast, a partial replacement of the polyether polyol caused an improvement of the cell structure keeping the mechanical properties of the modified foams at the same level.

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Polyols from recycled poly(ethylene terephthalate) flakes and rapeseed oil for polyurethane foams

Cited by 16 publications

References 14 publications

Rigid Polyurethane Foams with Various Isocyanate Indices Based on Polyols from Rapeseed Oil and Waste PET

Rigid Polyurethane Foams with Various Isocyanate Indices Based on Polyols from Rapeseed Oil and Waste PET

Composites made from a soybean oil biopolyurethane and cellulose nanocrystals

Influence of Chemical Structure of Petrochemical Polyol on Properties of Bio-polyurethane Foams

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