Antimicrobial open‐cell polyurethane foams with quaternary ammonium salts

Demirci, Fatma; Yıldırım, Kenan; Kocer, Hasan B.

doi:10.1002/app.45914

Cited by 15 publications

(8 citation statements)

References 25 publications

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“…The second stage of the process is associated with the degradation of the hard phase (urea bonds) and cellulose filler in composites. Mass loss at this stage may result from the distribution of urea bonds in the hard phase [44,45]. At this stage, the degradation rate in composites increases and the mass loss increases and change by approx.…”

Section: T a B L E 3 Dependence Of The Isocyanate Index On The Amount Of Water Added From Scgmentioning

confidence: 99%

The structure and properties of viscoelastic polyurethane foams with fillers from coffee grounds

et al. 2020

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The subject of the research presented in this article are viscoelastic polyurethane foams (VPF) made using a fillers from coffee grounds. The foams were made with varying content of coffee fillers. Foams and fillers were characterized by means of techniques such as infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry and cone calorimeter. The changes in the microstructure of the foams were analyzed using a scanning electron microscope. Foam properties in the compression test was assessed. As a result, it was concluded that the use filler from coffee grounds causes a significant reduction in compression set of foams after compression by 75% and by 90% of the height of the samples. It was shown that these changes are caused by changes in the chemical structure of the macromolecules of these foams but also in their structure. After addition the filler, all foams have permanent deformations with a value below the permissible limit of 10%. Addition of 20% by mass of filler caused by a decrease in the rate of heat release and the rate of smoke release during foam combustion.

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Section: T a B L E 3 Dependence Of The Isocyanate Index On The Amount Of Water Added From Scgmentioning

confidence: 99%

The structure and properties of viscoelastic polyurethane foams with fillers from coffee grounds

et al. 2020

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“…The second stage of the process is associated with the degradation of the hard phase (urethane bonds) and cellulose filler in the composites. The weight loss at this stage increases by approximately 15.7–17.5 wt %; this may result from the distribution of urethane bonds in the hard phase [ 48 , 49 , 50 ]. At this stage, the degradation rate of the composites decreases, and the weight loss changes to the range 0.41–0.35%/°C.…”

Section: Resultsmentioning

confidence: 99%

Composites of Open-Cell Viscoelastic Foams with Blackcurrant Pomace

et al. 2021

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Taking into account the circular economy guidelines and results of life cycle analyses of various materials, it was proposed to use a blackcurrant pomace filler in the production process of viscoelastic polyurethane (PUR) foams intended for application as mattresses, pillows, or elements for orthopedics. Open-cell viscoelastic PUR foams containing 10–60 per hundred polyols (php) blackcurrant pomace were prepared. It was found that after introducing the filler to the PUR foam formulation, the speed of the first stage of the foaming process significantly decreases, the maximum temperature achieved during the synthesis drops (by 30 °C for the foam containing 40 php of filler compared to unfilled foam), and the maximum pressure achieved during the synthesis of foam containing 20 php is reduced by approximately 57% compared to the foam without filler. The growth time of the foams increases with increasing the amount of introduced filler; for the foam containing 60 php, the time is extended even by about 24%. The effect of the filler on the physical, morphological, mechanical, and functional performances of PUR foam composites has been analyzed. The use of 60 php as the filler reduced the hardness of the foams by approximately 30% and increased their comfort factor from 3 to 5.

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“…The method proposed in this work involves the possibility to look for another quaternary ammonium salt in the film production, in order to obtain a similar potential application to that recently achieved by Demirci et al [32]. Their research was focused on adding quaternary ammonium salts to a polymeric matrix of polyurethane, with the objective of allowing for the antimicrobial activity of the polymer, which is an application of wider utility.…”

Section: Film-forming Capacitymentioning

confidence: 99%

Production, Preparation and Characterization of Microalgae-Based Biopolymer as a Potential Bioactive Film

et al. 2020

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Six microalgae strains were screened according to their biomass productivity and polymer synthesis, showing biomass productivity between 0.14 and 0.68 g/(L·d) for a 21-day growth period. Extracellular biopolymers from the spent culture media of Nostoc sp. (No), Synechocystis sp. (Sy), and Porphyridium purpureum (Pp) was obtained, and the yields of the clean biopolymer were 323, 204, and 83 mg/L, respectively. The crude biopolymer was cleaned up using a solid-phase extraction technique. The emulsification index E24 values for the clean biopolymer were 77.5%, 68.8%, and 73.3% at 0.323, 0.083, and 0.204 mg/mL, respectively. The clean biopolymer of the No strain showed the highest fungal growth inhibition against Fusarium verticillioides (70.2%) and Fusarium sp. (61.4%) at 2.24 mg/mL. In general, transparent and flexible biofilms were prepared using biopolymers of No and Pp. The microstructural analysis revealed the presence of pores and cracks in the biofilms, and the average roughness Ra values are 68.6 and 86.4 nm for No and Pp, respectively, and the root mean square roughness Rq values are 86.2 and 107.2 nm for No and Pp, respectively.

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Antimicrobial open‐cell polyurethane foams with quaternary ammonium salts

Cited by 15 publications

References 25 publications

The structure and properties of viscoelastic polyurethane foams with fillers from coffee grounds

The structure and properties of viscoelastic polyurethane foams with fillers from coffee grounds

Composites of Open-Cell Viscoelastic Foams with Blackcurrant Pomace

Production, Preparation and Characterization of Microalgae-Based Biopolymer as a Potential Bioactive Film

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