Listar Investigaciones por autor "Hernández Fernández, Joaquin"
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Applying a Green Solvent with Microwave, Ultrasound, and Soxhlet Extraction Techniques to Quantify the Slip Additive Cis-1,3-docosenamide and Nine Oxidative Degradation Byproducts in Polypropylene Samples
Hernández Fernández, Joaquin; Mendoza Pérez, Jaime; Ortega-Toro, Rodrigo (Cartagena de IndiasCampus Tecnológico, 2023-08-18)Erucamide is used as an important slip agent for polymers. However, erucamide can degrade during processing and long-term storage, forming various oxidation products. These degra dation products can affect the recovery ... -
Dimethylformamide Impurities as Propylene Polymerization Inhibito
Hernández Fernández, Joaquin; González-Cuello, Rafael; Ortega-Toro, Rodrigo (Cartagena de IndiasCampus Tecnológico, 2023-09-18)This research study examined how the use of dimethylformamide (DMF) as an inhibitor af fects the propylene polymerization process when using a Ziegler–Natta catalyst. Several experiments were carried out using TiCl4/MgCl2 ... -
Effect of Addition of Polyurea as an Aggregate in Mortars: Analysis of Microstructure and Strength
Chacon, Hernan; Cano, Heidis; Hernández Fernández, Joaquin; Guerra, Yoleima; Puello-Polo, Esneyder; Ríos-Rojas, John Fredy; Ruiz, Yolima (Cartagena de Indias, 2022)The addition of polymers in construction is a new tendency and an important step toward the production of structures with better functional properties. This work investigates the addition of polyurea (PU) as a polymeric ... -
Effects of Different Concentrations of Arsine on the Synthesis and Final Properties of Polypropylene
Hernández Fernández, Joaquin; Guerra, Yoleima; Puello-Polo, Esneyder; Marquez, Edgar (Cartagena de Indias, 2022-07-31)This article studies the effects of arsine on the synthesis and thermal degradation of 4 sam ples of virgin polypropylene (PP-virgin) and proposes reaction mechanisms that allow understanding of its behaviour. Different ... -
Experimental–Density Functional Theory (DFT) Study of the Inhibitory Effect of Furan Residues in the Ziegler–Natta Catalyst during Polypropylene Synthesis
Hernández Fernández, Joaquin; Puello-Polo, Esneyder; Marquez, Edgar (Cartagena de IndiasCampus Tecnológico, 2023-09-21)In this experimental–theoretical study, the effect of furan on Ziegler–Natta catalyst produc tivity, melt flow index (MFI), and mechanical properties of polypropylene were investigated. Through the analysis of the global ... -
Identification and Quantification of Microplastics in Effluents of Wastewater Treatment Plant by Differential Scanning Calorimetry (DSC)
Hernández Fernández, Joaquin; Cano, Heidis; Guerra, Yoleima; Puello Polo, Esneyder; Ríos-Rojas, John Fredy; Vivas-Reyes, Ricardo; Oviedo, Juan (Cartagena de Indias, 2022-04-20)In this research, the presence of microplastics was detected through a differential scanning calorimetry (DSC) analysis of three wastewater treatment plants. One of these plants applied only a preliminary treatment stage ... -
Impact of Traces of Hydrogen Sulfide on the Efficiency of Ziegler–Natta Catalyst on the Final Properties of Polypropylene
Hernández Fernández, Joaquin; Cano, Heidi; Aldas, Miguel (Cartagena de Indias, 2022-09-19)Sulfur compounds are removed from propylene through purification processes. However, these processes are not 100% effective, so low concentrations of compounds such as H2S may be present in polymer-grade propylene. This ... -
Parts per Million of Propanol and Arsine as Responsible for the Poisoning of the Propylene Polymerization Reactio
Hernández Fernández, Joaquin; Ortega-Toro, Rodrigo; González-Cuello, Rafael (Cartagena de Indias, 2023-09-01)Polypropylene synthesis is a critical process in the plastics industry, where control of catalytic activity is essential to ensure the quality and performance of the final product. In this study, the effect of two ... -
Study of the Chemical Activities of Carbon Monoxide, Carbon Dioxide, and Oxygen Traces as Critical Inhibitors of Polypropylene Synthesis
Hernández Fernández, Joaquin; Puello-Polo, Esneyder; Marquez, Edgar (Cartagena de IndiasCampus Tecnológico, 2024-02-23)This study outlines the investigation into how the compounds CO2 , CO, and O2 interact with the active center of titanium (Ti) on the surface of MgCl2 and how these interactions impact the productivity of the Ziegler–Natta ...
Universidad Tecnológica de Bolívar - 2017 Institución de Educación Superior sujeta a inspección y vigilancia por el Ministerio de Educación Nacional. Resolución No 961 del 26 de octubre de 1970 a través de la cual la Gobernación de Bolívar otorga la Personería Jurídica a la Universidad Tecnológica de Bolívar.