NMR Assignment of Carbonyl and Olefinic Regions of Amescla Resin

Abstract

The structural assignment of amescla resin was carried out using a methodology already established in a previous work published by Tavares and Silva. From the methodology, three structural fragments were determined, allowing us to conclude that this natural resin was polymerized from the double bond localized in the middle of the aliphatic chain.

Effects of Rare Earth Metal Triflates on Cationic Curing of Epoxy Resin/Polyamide Systems

“…It has been widely used in adhesives, coating, electronic encapsulating materials, and composite applications due to its specific physical properties and excellent processing characteristics [1,2] . However, the conventional epoxy resins are inefficient to satisfy the required properties of advanced composite materials which are important in industrial applications [3][4][5][6] , a variety of approaches have been used to improve the impact resistance, elasticity, toughness, and other properties of these materials [7] , such as DSC [8,9] , NMR [10] and FT-IR [11] .…”

The Use of Low‐Field Solid‐State NMR Relaxation to Study the Latex Extracted from Brosimum Parinarioides

“…Monitoring of latex stability through NMR analyses is possible because spin-lattice and spin-spin relaxation times are sensitive to small changes of the molecular mobility, including modification of the water diffusion process and of the reorganization and reorientation of latex molecules, due to changes of the intermolecular interactions. [10][11][12][13][14][15] Experimental Part…”

“…[2][3][4][5][6][7][8][9][10][11][12][13][14][15] Particularly, NMR analyses have been employed successfully to characterize the chemical composition of latexes, using different pulse sequences in high and low magnetic fields. [2][3][4][10][11][12][13][14][15] Based on the previous remarks, the main objective of the present work was to monitor the stability of the Brosimum parinarioides latex at storage conditions at ambient temperature for a period of twelve months. In order to do that, low-field NMR analyses were used to determine the hydrogen relaxation parameters and monitor the stability of the latex.…”

The NMR Study of the Latex Extracted from Brosimum Parinarioides

“…It is known that nuclear magnetic resonance is very much used to characterize a chemical structure and a molecular dynamic of samples [2][3][4][5][6][7][8][9][10][11][12][13][14][15]. This spectroscopy has many techniques, which differ in pulse sequence that permits us to evaluate both chemical constituents and molecular dynamic, because NMR analyzes the sample in different physical states [2][3][4][10][11][12][13][14][15]. According to the context, this work has a purpose to map the principal components that are responsible for the pharmacological and toxic effects and determine the stability degree of this latex after being kept at environment conditions.…”