Structure–properties relations in flexible polyurethane foams containing a novel bio-based crosslinker

Lan, Zhiyuan; Daga, Rahul; Whitehouse, Robert S.; McCarthy, Stephen P.; Schmidt, Daniel F.

doi:10.1016/j.polymer.2014.03.061

Cited by 48 publications

(37 citation statements)

References 26 publications

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“…This urea linkage was formed by the reaction between pMDI and water to generated carbon dioxide. The absorption at 1,099 cm-1 (f) was attributed to C-O stretching vibration of ether group in soft segment in PU foam [8]. …”

Section: Ftir Spectramentioning

confidence: 99%

“…Hence at high content of recycled PU foam CO 2 produced was hardly to be expanded. This led to the cell sized decreasing [8,9]. In addition, the incorporation of recycled PU foam polyol, possessed higher functionality than petrochemical polyol, therefore gelation occurred faster but CO 2 was difficult to be expanded.…”

Section: Foam Morphology Cell Size and Cell Size Distributionmentioning

confidence: 99%

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Influence of Recycled Polyurethane Polyol on the Properties of Flexible Polyurethane Foams

Kraitape

Thongpin

2016

Energy Procedia

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Flexible PU foam was synthesized by using recycled PU foam polyol (Infrigreen) which contain 4 functionality obtained from glycolysis wasted PU foam, as a polyol. PU foam is prepared by incorporation of recycled PU foam polyol 2, 4, 6, 8 and 10wt% in petrochemical polyol (CARADOL.SA34-05) which contain 2 functionality. Triethlylenediamine (TEGOAMIN 33) was used as the gelling catalyst. Polyether modified polysiloxane (TPGAOSTAB B8715 LF2) was the surfactant. Distilled water was used as a blowing agent to generate foam. Polymeric methylenediphenyl diisocyanate (pMDI) which contain 2.7 isocyanate groups/molecule was used for generate urethane linkage and carbon dioxide. The parameters investigated are characteristic time, i.e. cream time, gel time, rise time and tack free time, cell structure and cell morphology, tensile properties, compressive properties and compression set were compared with petrochemical based PU foam. It was found from the research that, cream time, gel time, rise time and tack free time, decrease with the recycled PU foam polyol content. It was also found that the incorporation of recycled PU foam polyol led to the increase in smaller cell size and large distribution of cell size. Tensile properties and compressive properties of PU foam increase with polyol functionality, including crosslink density and urea formation in PU foam. Decreasing of shape recover properties of PU foam obtained at high recycled PU foam polyol contents. This was caused by the deformation of hydrogen bonding between hard segments of PU chains. These results indicate that tensile properties and compressive properties of PU foam enhance by incorporation of recycled PU foam polyol.

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Section: Ftir Spectramentioning

confidence: 99%

Section: Foam Morphology Cell Size and Cell Size Distributionmentioning

confidence: 99%

Influence of Recycled Polyurethane Polyol on the Properties of Flexible Polyurethane Foams

Kraitape

Thongpin

2016

Energy Procedia

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“…Also, the matrix viscosity with the blowing catalyst is lower than that with the only gelling catalyst, and thus this low matrix viscosity gives much favorable condition for formation of cavities and pores. 22 Therefore, the highly occupied cavities and pores in the PUU foam produced at high content of the blowing catalyst reduce the material density, and the large cavities and pores at high catalyst content can be also seen in the inserted SEM images.…”

Section: Catalyst Effectsmentioning

confidence: 99%

“…21 However, it is difficult to obtain a properly balanced open cell structures in highly foamed materials because chemical components such as polyol, isocyanate, catalyst, and water in manufacturing the flexible PUU foam can change the reaction kinetics. 22 Therefore, in this study our aim is to investigate the effects of chemical components on cell properties of the PUU foams. The flexible PUU foams were systematically synthesized with a glycerol based polyether polyol and a methylene diphenyl diisocyanate by changing additional components (gelling and blowing catalysts, surfactant, and water).…”

Section: Introductionmentioning

confidence: 99%

Modulation of cavities and interconnecting pores in manufacturing water blown flexible poly (urethane urea) foams

Gwon

Sung

Kim

2015

Int. J. Precis. Eng. Manuf.

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Flexible poly (urethane urea) (PUU) foam based on the polyol and isocyanate with various additional components is synthesized by one shot polymerization. FTIR analysis shows that both urethane and urea formations are closely related to the catalysts, water, and NCO index. Increment of the catalyst concentration increases the initial volume velocity of the flexible PUU foam but decreases the bulk density by the increased number of cavities and pores. Water has strong effects on the initial volume velocity and bulk density, whereas increment of the NCO index has a little influence on the physical properties. The average cavity and pore sizes increase with increasing the equivalents ratio of water to polyol, but there is a limiting equivalents ratio in the PUU foam systems not to form coalesced or collapsed microcellular structure. The foams are also characterized using a scanning electron microscope and a Fourier transformed infrared spectroscopy.

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“…The decrease in tensile strength of PYs is due to the increase of open cell content of FPUFs. Much higher open cell content deteriorates the strength of FPUFs and decreases the attainable deformation quantity[19,37]. Consequently, PY3 has lower tensile strength and elongation at break.…”

mentioning

confidence: 99%

Effect of nano-montmorillonite as cell opener on cell morphology and resilient performance of slow-resilience flexible polyurethane foams

et al. 2015

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In this paper, polypropylene glycol Y-1900, unmodified nano-montmorillonite (MMT) and organically modified nano-montmorillonite (OMMT) serving as cell openers are introduced into slow-resilience flexible polyurethane foams (FPUFs), aiming at investigating the effects of them on cell morphology and the relationships between cell structure, nano-montmorillonite types and resilient performance of slow-resilience FPUFs. Experimental results indicate that OMMT can sever as an excellent alternative for conventional cell openers. The ability of nanomontmorillonite to open cells mainly depends on their surface property. Both MMT and OMMT are exfoliated in foaming process and play a significant role in cell diameter for nucleating function. The resilient performance of foams is closely related to open cell content and polyurethane matrix nature, due to that the friction effect of nanomontmorillonite and the deformation of open cells will lead to large energy dissipation. The mechanical properties (tensile strength, elongation at break and compression set) are related to cell structure and nano-montmorillonite. The addition of nano-montmorillonite especially organically modified nano-montmorillonite is an effective method to improve resilient performance and mechanical strength.However, this improvement is at the expense of impairing toughness of foams.

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Structure–properties relations in flexible polyurethane foams containing a novel bio-based crosslinker

Cited by 48 publications

References 26 publications

Influence of Recycled Polyurethane Polyol on the Properties of Flexible Polyurethane Foams

Influence of Recycled Polyurethane Polyol on the Properties of Flexible Polyurethane Foams

Modulation of cavities and interconnecting pores in manufacturing water blown flexible poly (urethane urea) foams

Effect of nano-montmorillonite as cell opener on cell morphology and resilient performance of slow-resilience flexible polyurethane foams

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