Synthesis, characterization and physical properties of rigid polyurethane foams prepared with poly(propylene oxide) polyols containing graphene oxide

Santiago‐Calvo, Mercedes; Blasco, Victoria; Ruiz, C.; París, Rodrigo; Villafañe, Fernando; Rodríguez‐Pérez, Miguel Ángel

doi:10.1016/j.eurpolymj.2017.10.013

Cited by 32 publications

(34 citation statements)

References 33 publications

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“…In a previous work describing the properties of PUR containing GO, we reported that the optimum content of GO in the final foam was 0.033 wt % . This produced a significant cell size reduction of 19% in comparison to pure foam without GO, and consequently the thermal conductivity was also reduced around 4%.…”

Section: Resultsmentioning

confidence: 84%

“…Distilled water was used as a blowing agent. Polyol functionalized with 1000 ppm of GO (OH index 358 mg KOH g −1 , viscosity 547.6 mPa·s, 570 Da) was synthesized by Repsol S.A (Móstoles, Spain) …”

Section: Methodsmentioning

confidence: 99%

“…RPU foam containing 0.033 wt % GO (1000 ppm in polyol) is the reference material whose components were modified to study their effect on the RPU properties . Isocyanate index was varied from 115 to 130 (Table ), gelling and foaming catalyst from 0.5 parts per weight (ppw) to 2 ppw (Table ), and surfactant from 1 parts per weight (ppw) to 2 ppw (Table ).…”

Section: Methodsmentioning

confidence: 99%

“…In a previous study, we described the formation of water‐blown RPU foams from polyols functionalized with low amounts of GO (0.017, 0.033, and 0.083 wt %) . One of the main advantages of this approach is that GO particles are chemically incorporated into polyol chains, which precludes the agglomeration of fillers.…”

Section: Introductionmentioning

confidence: 99%

“…The present work is based on the information collected from the aforementioned research, the main target being to improve the mechanical properties of RPU foams functionalized with GO, whereas the thermal conductivity is maintained or improved. For this purpose, we have chosen as starting material the better foam previously obtained, that is, that containing 0.033 wt %.…”

Section: Introductionmentioning

confidence: 99%

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Improvement of thermal and mechanical properties by control of formulations in rigid polyurethane foams from polyols functionalized with graphene oxide

Santiago‐Calvo

Blasco

Ruiz

et al. 2019

J of Applied Polymer Sci

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This article addresses the optimization of water‐blown rigid polyurethane (RPU) foams obtained from a polyol functionalized with graphene oxide (GO). For this purpose, a series of RPU foams are herein synthesized by varying either the isocyanate index, the contents of catalyst or the contents of surfactant, or a combination of these three components. The modifications introduced in the formulation are based on the effect of GO on the reaction kinetics. These strategies are mainly focused on the increase of both isocyanate conversion and polymerization reaction, which decrease for the foams containing GO. Density, cellular structure, thermal conductivity, and mechanical properties of the resulting foams are herein investigated. The results show how controlling PU formulation allows to improve both the thermal and the mechanical behavior in these RPU foams containing GO. The highest cell size reduction of 25% and the lowest thermal conductivity are obtained for the sample with a simultaneous increase in isocyanate index, catalyst content, and surfactant content. Moreover, the adequate combination of these components leads to a high improvement of 59% of the relative Young's modulus and of 54% of the relative collapse stress. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47474.

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Section: Resultsmentioning

confidence: 84%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Improvement of thermal and mechanical properties by control of formulations in rigid polyurethane foams from polyols functionalized with graphene oxide

Santiago‐Calvo

Blasco

Ruiz

et al. 2019

J of Applied Polymer Sci

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Examples of Polymers

2020

Flame Retardants

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Effects of dolomite and intumescent flame retardant additions on thermal and combustion behaviors of rigid polyurethane foams

Aydoğan

Usta

2023

J of Applied Polymer Sci

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Weak thermal stability and low‐burning resistance of the rigid polyurethane foams are the classic problems in the usage of them. Therefore, it is required to improve these problems of the foams while reducing the cost of production. This study investigated the effects of dolomite (DOL) and intumescent flame retardant (IFR) system on thermal and combustion behaviors of rigid polyurethane foams (RPUFs). For this purpose, DOL (5, 10, and 15 wt%) and DOL/IFR (5/5, 10/5, and 5/10 wt%) combinations were added into RPUFs. Thermogravimetric analyses were performed to investigate the thermal decompositions of the foams and the thermal conductivity measurements were performed to examine the effects of DOL and DOL/IFR additions on the thermal insulation properties of the foams. Cone calorimeter and UL 94 tests were performed to investigate the fire resistances of the foams. The test results showed that up to 15 wt% DOL could be incorporated into the rigid polyurethane foams as filler without any problems in the foam productions, and the thermal and the combustion behaviors of the foams were slightly enhanced. In addition, it was determined that IFR should be used to improve the thermal stability and the fire resistance of the DOL added foams. Among DOL/IFR combinations, 5 wt% DOL and 10 wt% IFR addition satisfied the best performance in terms of the thermal stability and the fire resistance with reducing the smoke, CO, CO2 and NO emissions. In general, the additions of DOL and IFR slightly increased the thermal conductivity coefficients of the foams.

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Synthesis, characterization and physical properties of rigid polyurethane foams prepared with poly(propylene oxide) polyols containing graphene oxide

Cited by 32 publications

References 33 publications

Improvement of thermal and mechanical properties by control of formulations in rigid polyurethane foams from polyols functionalized with graphene oxide

Improvement of thermal and mechanical properties by control of formulations in rigid polyurethane foams from polyols functionalized with graphene oxide

Examples of Polymers

Effects of dolomite and intumescent flame retardant additions on thermal and combustion behaviors of rigid polyurethane foams

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