A comprehensive multidimensional liquid chromatography system coupled to Electrospray Ionization-Mass Spectrometry (LCxLC-ESI-MS) was developed for detailed characterization and quantitation of solid epoxy resin components. The two orthogonal modes of separation selected were size exclusion chromatography (SEC) in the first dimension and liquid chromatography at critical conditions (LCCC) in the second dimension. Different components present in the solid epoxy resins were separated and quantitated for the first time based on the functional groups and molecular weight heterogeneity. Coupling LCxLC separations with mass spectrometry enabled the identification of components resolved in the two-dimensional space. Several different functional group families of compounds were separated and identified, including epoxy-epoxy and epoxy-alpha-glycol functional oligomers, and their individual molecular weight ranges were determined. Repeatability obtained ranged from 0.5% for the main product to 21% for oligomers at the 0.4% concentration level.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/ac9001047 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
"Reactive" Chemical Strategy to Attain Substrate Independent "" Omniphobic Solid Anti-Biofouling Coatings.
Adv Funct Mater
September 2024
School of Chemical, Materials and Biomedical Engineering, University of Georgia, Athens, Georgia, 30602, United States of America.
Covalent and defect-free surface-grafted solid lubricating chains that can impart slippery behavior have proven advantageous over lubricant infused and textured anti-wetting surfaces. Herein, the co-hydrolysis and co-condensation of a mixture of organosilanes followed by the epoxy-amine ring opening reaction at the interface results in a highly robust, transparent and solid slippery omniphobic coating (LL-OSC). The presence of the epoxy-terminated organosilane a) acts as a molecular spacer in between the low-surface energy, rigid fluorine terminated silane and b) provides 'reactive' epoxy groups for covalent binding to a pre-functionalized amine surface for potential applicability in droplet transport and manipulation, diagnostics etc.
View Article and Find Full Text PDFExperimental free vibration and tensile test results of a five-layer sandwich plate by comparing various carbon nanostructure reinforcements with SMA.
Heliyon
May 2024
Department of Solid Mechanics, Faculty of Mechanical Engineering, University of Kashan, Kashan, P.O. Box 87317-53153, Iran.
Article Synopsis
- The study explores the impact of different carbon nanostructure reinforcements and nitinol shape memory alloy (SMA) wire on the vibration behavior of a five-layer sandwich plate with a foam core, aiming to optimize stiffness and weight for sensitive industries.
- It highlights how various reinforcements like carbon nanotubes, nanorods, and graphene platelets can significantly enhance the mechanical properties, with graphene showing the most substantial improvement in Young's modulus.
- The research also introduces a novel construction method for the five-layer model using a vacuum pump, offering a more efficient alternative to traditional manual methods and facilitating a thorough experimental examination of its properties.
Additive manufacturing of 3D flow-focusing millifluidics for the production of curable microdroplets.
RSC Adv
December 2024
Physics of Fluids Group, Max Planck University of Twente Center for Complex Fluid Dynamics, University of Twente P.O. Box 217 7500 AE Enschede The Netherlands
Microfluidics plays a crucial role in the generation of mono-sized microdroplet emulsions. Traditional glass microfluidic chips typically lack versatility in generating curable droplets of arbitrary liquids due to the inherent hydrophilic nature of glass and to fabrication constraints. To overcome this, we designed a microdroplet generator with 3D flow-focusing capabilities that can be 3D-printed.
View Article and Find Full Text PDFQuantum Chemical Model Calculations of Adhesion and Dissociation between Epoxy Resin and Si-Containing Molecules.
Molecules
October 2024
Department of Chemistry, Graduate School of Science, Tohoku University, 6-3, Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan.
There is no doubt that when solid surfaces are modified, the functional groups and atoms directly bonded to solid atoms play a major role in adsorption interactions with molecules or resins. In this study, the adhesion and dissociation between epoxy resin and molecules containing Si atoms were analyzed. The analysis, conducted in contact with the solid surface of silicon, utilized quantum chemical calculations based on a molecular model.
View Article and Find Full Text PDFEnhancing Mechanical and Tribological Properties of Epoxy Composites with Ultrasonication Exfoliated MoS: Impact of Low Filler Loading on Wear Performance and Tribofilm Formation.
Nanomaterials (Basel)
October 2024
Department of Mechanical Engineering, Auckland University of Technology, Auckland 1010, New Zealand.
This study highlights the impact of low amounts of MoS quantities on composite performance by examining the effects of ultrasonication exfoliated MoS at different loadings (0.1-0.5 wt%) on the mechanical and tribological parameters of epoxy composites.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!