Effects of surfactants on mechanical and thermal properties of soy-based polyurethane foams

Dhaliwal, Gurjot S.; Anandan, Sudharshan; Bose, Mousumi; Chandrashekhara, K.; Nam, Paul Ki-souk

doi:10.1177/0021955x20912200

Cited by 15 publications

(7 citation statements)

References 33 publications

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“…The properties of PU, including the hardness and softness, can be tailored by adjusting the quantities and types of isocyanates and polyols used in the synthesis process. In addition, the final material can be modified by incorporating additives such as flame retardants, 61 moisture scavengers, 62 surfactants, 63 pigments, 64 and blowing agents. 65…”

Section: Polyurethane Synthesismentioning

confidence: 99%

Polyurethane‐basedcomposites with promising antibacterial properties

Kasi

Sathishkumar

Zhang

et al. 2022

J of Applied Polymer Sci

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Polyurethane (PU) is a well-known synthetic polymer consisting of isocyanates, polyols, and chain extenders. The incorporation of fillers into the PU polymeric matrix, including inorganic nanomaterials, synthetic polymers, natural components, quaternary ammonium salts, and commercial drugs, bestows the endproducts with unique and improved physicochemical properties. Fillers can be used to tailor the molecular orientation, crystallinity, cross-linking, and functional chemical groups of PU-based composites. The bactericidal ability of PU composites highly depends on their surface composition, morphology, charge, and stability. Recent advancements highlight the potential of PU composites in combating bacterial infections. In this review, the cutting-edge of inorganic and organicbased PU composites for antibacterial applications is addressed. Notably, selective examples of scientific reports' key findings and their crucial information on PU composites are discussed. Furthermore, the positive impact of PU composites on the future prospects of this field is explored. This review comprehensively deliberates the values of PU composites towards practical applications in the biomedical field of antibacterial activity. This review can help researchers to gain widespread knowledge and a better understanding of PU composites for antibacterial applications.

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Section: Polyurethane Synthesismentioning

confidence: 99%

Polyurethane‐basedcomposites with promising antibacterial properties

Kasi

Sathishkumar

Zhang

et al. 2022

J of Applied Polymer Sci

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“…Equally, tensile modulus values were higher when RP1 was added to the formulation. An increase in the RP content leads to an improvement of tensile properties of RPUFs, probably due to a higher cross-linking of the foams with recycled components [ 34 ]. Partial substitution of commercial polyol by RP1 up to 10 wt.% caused a slight decrease in the compressive strength values.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Rigid Polyurethane Foams Incorporating Polyols from Chemical Recycling of Post-Industrial Waste Polyurethane Foams

et al. 2022

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The preparation and characteristics of rigid polyurethane foams (RPUFs) synthesized from polyols obtained by glycolysis of post-industrial waste RPUFs have been studied. More precisely, waste rigid foams that have been chemically recycled by glycolysis in this work are industrially produced pieces for housing and bracket applications. The glycolysis products have been purified by vacuum distillation. The physicochemical properties of the polyols, such as hydroxyl value, acid value, average molecular weight (Mn) and viscosity have been analyzed. The chemical structure and thermal stability of the polyols have been studied by means of FTIR and TGA, respectively. Partial substitution of the commercial polyol (up to 15 wt.%) by the recycled polyols increases the reactivity of the RPUFs synthesis, according to short characteristic times during the foaming process along with more exothermic temperature profiles. Foams formulated with recycled polyols have a lower bulk density (88.3–96.9 kg m−3) and smaller cell sizes compared to a conventional reference RPUF. The addition of recycled polyols (up to 10 wt.%) into the formulation causes a slight decrease in compressive properties, whereas tensile strength and modulus values increase remarkably.

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“…Many studies reveal the influence of these parameters on the properties of PU foams. [25][26][27][28][29][30] Among them, chain extenders are used in minor amounts in the formulation, but can have a serious impact on the final properties of the PU foam. [31][32][33][34][35] Chain extenders are low molecular weight molecules with two, three, four, or more functional groups.…”

Section: Introductionmentioning

confidence: 99%

Effects of di- and trifunctional chain extenders on the properties of flexible cold-cure polyurethane foams

Sohrabi

2023

Journal of Cellular Plastics

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In this study, effects of di- and trifunctional chain extenders including ethylene glycol (MEG), ethanolamine (MEA), diethanolamine (DEA), and glycerin (GLY) were investigated. 0.3, 0.6, and 0.9 php (parts per hundred parts of polyol mixture) of the chain extenders were added to the polyol formulation. Then, foam parts were produced by molding. The reaction profile, free rise density (FD), and mechanical properties of the specimens were tested regarding ASTM D7487 test methods. First of all, reaction profiles were affected by the chemical nature of the chain extenders. MEA and DEA which have a primary and secondary amine unit, respectively, accelerated both the polymerization and blow reactions and resulted in faster cream (CT), gel (GT), and end-of-rise time (RT) values. On the other hand, MEG also accelerated GT, but retarded CT. Finally, GLY retarded CT, GT, and RT of foam samples. FD of all samples were almost the same with a slight decrease by increasing the amount of chain extenders. Besides, force-to-crush (FTC) as a measure of closed- or open-cell structure, was investigated. Results showed that incorporating di- and trifunctional chain extenders led to a remarkable increase in FTC values. The influence was more profound with amine-based chain extenders. The effects of chain extenders on the mechanical properties were also studied according to the ASTM D3574. In the compression set test, using difunctional chain extenders up to 0.6 php, improved the performance. But higher amounts reversed the trend. On the other hand, trifunctional chain extenders declined the compression set properties of the foam. The addition of chain extenders dwindled the tensile and tear properties of the foams. However, the reduction was less with difunctional chain extenders.

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Effects of surfactants on mechanical and thermal properties of soy-based polyurethane foams

Cited by 15 publications

References 33 publications

Polyurethane‐basedcomposites with promising antibacterial properties

Polyurethane‐basedcomposites with promising antibacterial properties

Synthesis of Rigid Polyurethane Foams Incorporating Polyols from Chemical Recycling of Post-Industrial Waste Polyurethane Foams

Effects of di- and trifunctional chain extenders on the properties of flexible cold-cure polyurethane foams

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