Flexible polyurethane foams reinforced with organic and inorganic nanofillers

Ghasemi, Shokoofeh; Amini, Ezatollah; Tajvidi, Mehdi; Kızıltaş, Alper; Mielewski, Deborah F.; Gardner, Douglas J.

doi:10.1002/app.49983

Cited by 23 publications

(30 citation statements)

References 43 publications

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“…Finally, considering that the foam without nanosilica presented a density value of 45.61 kg/m 3 , it can be also stated that this filler increased the foams final density. This effect agrees with that observed for other fillers, that of increased the viscosity of the foaming system, hampering the CO 2 expansion and obtaining denser foams [35][36][37].…”

Section: Synthesis Of Rigid Pu Foams Using Recovered Polyol and Fillersupporting

confidence: 90%

Glycolysis of Polyurethanes Composites Containing Nanosilica

et al. 2021

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Rigid polyurethane (RPU) foams have been successfully glycolyzed by using diethylene glycol (DEG) and crude glycerol (CG) as transesterification agents. However, DEG did not allow to achieve a split-phase process, obtaining a product with low polyol purity (61.7 wt %). On contrary, CG allowed to achieve a split-phase glycolysis improving the recovered polyol purity (76.5%). This is an important novelty since, up to now, RPUs were glycolyzed in single-phase processes giving products of low polyol concentration, which reduced the further applications. Moreover, the nanosilica used as filler of the glycolyzed foams was recovered completely pure. The recovered polyol successfully replaced up to 60% of the raw polyol in the synthesis of RPU foams and including the recovered nanosilica in the same concentration than in glycolyzed foam. Thus, the feasibility of the chemical recycling of this type of polyurethane composites has been demonstrated. Additionally, PU foams were synthesized employing fresh nanosilica to evaluate whether the recovered nanosilica has any influence on the RPU foam properties. These foams were characterized structurally, mechanically and thermally with the aim of proving that they met the specifications of commercial foams. Finally, the feasibility of recovering the of CG by vacuum distillation has been demonstrated.

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Section: Synthesis Of Rigid Pu Foams Using Recovered Polyol and Fillersupporting

confidence: 90%

Glycolysis of Polyurethanes Composites Containing Nanosilica

et al. 2021

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“…This versatility of PUF is due to their excellent strength to weight ratio and insulation properties (thermal, electrical, acoustic). 2 The polyurethane foam market is valued at USD 38 billion in 2020 and is expected to reach USD 54 billion by 2025. 3 Polyurethanes are made from two major components, that is, polyols and isocyanates.…”

Section: Introductionmentioning

confidence: 99%

“…Whereas flexible PUF are used as packaging materials, cushioning materials (bedding and furniture in a home, car seats, headliner, and under‐the‐hood applications in automotive), and insulating materials. This versatility of PUF is due to their excellent strength to weight ratio and insulation properties (thermal, electrical, acoustic) 2 . The polyurethane foam market is valued at USD 38 billion in 2020 and is expected to reach USD 54 billion by 2025 3 .…”

Section: Introductionmentioning

confidence: 99%

Biobased flexible polyurethane foams manufactured from lactide‐based polyester‐ether polyols for automotive applications

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Kızıltaş

Scheper

et al. 2021

J of Applied Polymer Sci

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In this study, biobased polyester-ether polyols derived from meso-lactide and dimer acids were evaluated for flexible polyurethane foams (PUF) applications. Initially, the catalyst concentration was optimized for the biobased PUF containing 30% of biobased polyol (70% petroleum-based polyol). Then, the same formulation was used for biobased PUF synthesis containing 10%-40% of biobased polyols. The performance of biobased PUF was compared with the performance of the control foam made with 100% petroleum-based polyol. The characteristic times (cream, top of the cup, string gel, rise, tack-free) of biobased PUF were determined. The biobased PUF were evaluated for the mechanical (tensile and compressive) and morphological properties. As the wet compression set is important for automotive applications, it was measured for all biobased PUF. The thermal degradation behavior of biobased PUF was also evaluated and compared with the control foam. The effect of different hydroxyl and acid values of polyols on the mechanical properties of biobased PUF is also discussed. The miscibility of all components of PUF formulations is crucial in order to produce a foam with uniform properties. Thus, the miscibility of biobased polyols with commercial petroleum-based polyol was studied.

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“…In order to alleviate this problem, the development of biomass resources and the preparation of bio‐based materials have gradually attracted the attention of researchers 11‐15 . Nowadays, the concerning of natural polymers reinforced composite materials has been drawn for the excellent mechanical properties as well as the ecofriendly nature of the fillers 16‐21 . The bagasse fiber is a kind of byproducts in sugar industry with abundant source and low cost.…”

Section: Introductionmentioning

confidence: 99%

Effect of fiber surface treatment on the structure and properties of rigid bagasse fibers/polyurethane composite foams

et al. 2021

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Bagasse fibers reinforced rigid polyurethane foams were successfully prepared by one‐step method. In order to improve the interfacial bonding strength between the filler and matrix, the bagasse fiber was modified by alkali treatment before incorporation into the foams. The surface roughness of the fiber increased after treatment and chemical bonding formed between the ‐OH groups on the fibers and the excess ‐NCO groups, which improved the interfacial interactions between the filler and matrix. With the increase of fiber content, the close cell ratio decreased, however, the thermal conductivity of rigid polyurethane foams almost unchanged. The mechanical performance decreased with the increase of fiber content, but the specific strength and modulus exhibited different changing trends for the reinforcing effect of the fibers on the matrix. The dimensional stability of the foams was greatly enhanced with incorporation of bagasse fibers. When the bagasse fiber content reached 40 wt%, the dimensional stability was best, and the dimensional change rates in the three directions of length, width, and height were less than 1%. These composite foams with improved performance were in line with the current trend of green environmental protection and would possess wide applications in sound/heat insulation, industrial manufacturing, packaging industry, and hence forth.

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Flexible polyurethane foams reinforced with organic and inorganic nanofillers

Cited by 23 publications

References 43 publications

Glycolysis of Polyurethanes Composites Containing Nanosilica

Glycolysis of Polyurethanes Composites Containing Nanosilica

Biobased flexible polyurethane foams manufactured from lactide‐based polyester‐ether polyols for automotive applications

Effect of fiber surface treatment on the structure and properties of rigid bagasse fibers/polyurethane composite foams

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