Nora Elizondo-Villarreal^1,*, Luz H. Verástegui-Dominguez¹, Jose J. Quijano-Briones¹, Francisco J. Vázquez-Rodríguez², Eden Rodríguez-Castellanos³, Enrique López-Cuellar³, Ernesto Torres-Lopez¹, Victor M. Castaño-Meneses^4,*

Journal of Renewable Materials, Vol.10, No.12, pp. 3559-3572, 2022, DOI:10.32604/jrm.2022.021945

Abstract

Agave salmiana ash and poultry eggshell powder as CaO sources were used for obtaining nanostructured hydroxyapatite (HAP). The synthesis was carried out by the Green Chemistry Hydrothermal Biosynthesis at 180°C with a pH of 5, by reacting CaO from Agave Salmiana ash and Eggshell powder, with dibasic calcium phosphate (CaHPO₄•2H₂O) in an aqueous solution, with Aloe barbadensis extract. The product was characterized by X-ray diffraction, Fourier-transform infrared spectroscopy (FT-IR), Scanning Electron Microscopy (SEM), and Transmission Electron Microscopy (TEM). The size and shape of the hydroxyapatite particles changed dramatically in the presence of Aloe barbadensis. Large crystals of Hydroxyapatite were observed… More > Graphic Abstract

M. Kirpluks^1*, D. Kalnbunde¹, Z. Walterova², U. Cabulis¹

Journal of Renewable Materials, Vol.5, No.3-4, pp. 258-270, 2017, DOI:10.7569/JRM.2017.634116

Abstract In this study, polyols with high average functionality were synthesized from a renewable resource, rapeseed oil, as raw material for rigid PU foam production. A well-known method of rapeseed oil fatty acid double bond epoxidation was used to introduce oxirane rings into rapeseed oil structure. The temperature influence on epoxidation reaction conversion rate was studied by volumetric and FTIR spectra analysis. After epoxidation of rapeseed oil, an oxirane ring-opening reaction was carried out to obtain high functionality polyols. Diethylene glycol, a conventional oxirane ring-opening reagent, was compared to amine-based polyfunctional alcohols, diethanolamine and triethanolamine. The introduction of tertiary amine groups… More >

M. Kirpluks^1*, U. Cabulis¹, A. Ivdre¹, M. Kuranska², M. Zieleniewska³, M. Auguscik³

Journal of Renewable Materials, Vol.4, No.1, pp. 86-100, 2016, DOI:10.7569/JRM.2015.634132

Abstract The most common sustainable solution for polyurethane (PU) materials is their production using renewable resources. Polyols derived from biomass and recycled polymers are the most promising way to do that. This study compares five different sustainable polyols as a possible raw material for production of highdensity rigid PU foams for automotive application. The goal of our study was to show that biobased polyols are a suitable replacement for polyols derived from petrochemical products. The influence of the chemical structure of polyols on the PU polymer matrix and foam properties was investigated. Two sources of PU raw material feedstock were studied:… More >