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2 results on '"Dickens O. Agumba"'

1. Recent Research Progress on Lignin-Derived Resins for Natural Fiber Composite Applications

Author

Bijender Kumar, Dickens O. Agumba, Duc H. Pham, Muhammad Latif, Dinesh, Hyun Chan Kim, Hussein Alrobei, and Jaehwan Kim

Subjects
lignin, epoxy resins, mechanical properties, flame retardancy, fiber composite, Organic chemistry, QD241-441
Abstract

By increasing the environmental concerns and depletion of petroleum resources, bio-based resins have gained interest. Recently, lignin, vanillin (4-hydroxy-3-methoxybenzaldehyde), and divanillin (6,6′-dihydroxy-5,5′-dimethoxybiphenyl-3,3′-dicarbaldehyde)-based resins have attracted attention due to the low cost, environmental benefits, good thermal stability, excellent mechanical properties, and suitability for high-performance natural fiber composite applications. This review highlights the recent use of lignin, vanillin, and divanillin-based resins with natural fiber composites and their synthesized processes. Finally, discussions are made on the curing kinetics, mechanical properties, flame retardancy, and bio-based resins’ adhesion property.

Published
2021
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2. Preparation of Cellulose Nanocrystal-Reinforced Physical Hydrogels for Actuator Application

Author

Tippabattini Jayaramudu, Dickens O. Agumba, Jaehwan Kim, Lindong Zhai, and Hyun Chan Kim

Subjects
Materials science, Scanning electron microscope, General Chemical Engineering, physical crosslinking, soft actuators, 02 engineering and technology, macromolecular substances, 010402 general chemistry, 01 natural sciences, complex mixtures, Inorganic Chemistry, chemistry.chemical_compound, medicine, lcsh:QD901-999, General Materials Science, Fourier transform infrared spectroscopy, Cellulose, cellulose nanocrystals, technology, industry, and agriculture, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 0104 chemical sciences, Nanocrystal, chemistry, Chemical engineering, Self-healing hydrogels, lcsh:Crystallography, Swelling, medicine.symptom, physical hydrogels, 0210 nano-technology, Dispersion (chemistry), Actuator
Abstract

In the present investigation, we prepared cellulose nanocrystal (CNC)-reinforced polyvinyl alcohol-cellulose (PVA-Cell) physical hydrogels using a simple blending method for actuator application. The prepared hydrogels were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, and the surface and cross-section were studied by scanning electron microscopy. CNCs were well dispersed in the PVA-Cell hydrogel. In the preparation process, surface hydroxyl groups of the CNC and PVA-Cell matrix hydroxyl groups were interacted to produce uniform dispersion of CNCs in the hydrogels. Swelling behavior and compression studies revealed that the increase of the CNCs reinforced the crosslinking. The actuation test of the prepared hydrogels showed that the displacement linearly increased with the voltage, and the immense output displacement was observed at low CNC concentration. The prepared hydrogels are applicable for soft robot actuators and active lens.

Published
2020

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