Rapeseed oil-based rigid polyisocyanurate foams modified with nanoparticles of various type

Cābulis, Uģis; Sevastyanova, Irina; Andersons, J.; Beverte, I.

doi:10.14314/polimery.2014.207

Cited by 22 publications

(18 citation statements)

References 12 publications

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“…A modification of vegetable oils in order to introduce reactive hydroxyl groups can be carried out by means of various methods. These methods are mostly based on the conversion of double bonds into hydroxyl groups [17] or transesterification and transamidization reactions [18][19][20][21]. The structure of a bio-polyol, viscosity, molecular weight and hydroxyl value have a significant impact on the foaming process of a PUR system and consequently on the cellular structure and properties of PUR foams [22].…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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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“…Chemical basis and thermal conductivity of bio-based insulation foams, made of polyol system partially derived from plant base oil, have been described in detail by the works of Kirpluks et al [36] and Cabulis et al [37]. Mechanical properties for the natural PU foam material applied in current research are tested and summarized in Table 3.…”

Section: Materials Propertiesmentioning

confidence: 99%

Flexural behavior of sandwich panels with cellular wood, plywood stiffener/foam and thermoplastic composite core

Labans

Kalniņš

Bisagni

2017

Jnl of Sandwich Structures & Materials

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A series of experimental tests have been carried out on three types of novel sandwich panels mainly designed for application in lightweight mobile housing. Two types of the panels are manufactured entirely from wood-based materials while the third one presents a combination of plywood for surfaces and corrugated thermoplastic composite as a core part. All sandwich panels are designed to allow rapid one-shot manufacturing. Mechanical performance has been evaluated in four-point bending comparing the data to the reference plywood board. Additionally, finite element simulations were performed to evaluate global behavior, stress distribution and provide the basis for a reliable design tool. Obtained results show sufficient mechanical characteristics suitable for floor and wall units. Compared to a solid plywood board, sandwich alternative can reach up to 42% higher specific stiffness, at the same time maintaining sufficient strength characteristics.

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“…The Polyisocyanurate (PIR) foam polymer differs from the traditional Polyurethane (PUR) foam in the stronger molecular structure that is achieved in its manufacturing procedure, consisting on highly cross-linked isocyanurate rings [1,2]. These enhancements are traduced in the thermal stability, flame retardance and mechanical behaviour of PIR [3,4], turning it more suitable than PUR to be used as a foam material in situations in which these properties play a relevant role [5,6].…”

Section: Introductionmentioning

confidence: 99%

Influence of service temperature on shear creep behaviour of a rigid low-density closed-cell PIR foam

Figueira

Sena-Cruz

Pereira

et al. 2019

Construction and Building Materials

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An experimental campaign was carried out to assess shear creep behaviour of a rigid low-density closedcell polyisocyanurate (PIR) foam. Two service temperature values were considered, 20 ºC and 30 ºC, and the applied stresses ranged between 20% and 60% of the corresponding shear strength. The results showed that a stress amplitude of 30% was enough to cause nonlinear creep response. Furthermore, creep deformations were slightly smaller in the tests at 30 ºC, a fact that matched the viscoelastic response of the PIR foam obtained from DMA testing. Finally, creep prediction curves were calibrated through an analytical approach based on the Findley's power law.

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Rapeseed oil-based rigid polyisocyanurate foams modified with nanoparticles of various type

Cited by 22 publications

References 12 publications

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

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

Flexural behavior of sandwich panels with cellular wood, plywood stiffener/foam and thermoplastic composite core

Influence of service temperature on shear creep behaviour of a rigid low-density closed-cell PIR foam

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