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Full-Text Articles in Engineering
Effect Of Microcapsule Content On Diels-Alder Room Temperature Self-Healing Thermosets., Sadella C Santos, John J La Scala, Giuseppe R Palmese
Effect Of Microcapsule Content On Diels-Alder Room Temperature Self-Healing Thermosets., Sadella C Santos, John J La Scala, Giuseppe R Palmese
Henry M. Rowan College of Engineering Faculty Scholarship
A furan functionalized epoxy-amine thermoset with an embedded microcapsule healing system that utilizes reversible Diels-Alder healing chemistry was used to investigate the influence of microcapsule loading on healing efficiency. A urea-formaldehyde encapsulation technique was used to create capsules with an average diameter of 150 µm that were filled with a reactive solution of bismaleimide in phenyl acetate. It was found that optimum healing of the thermoset occurred at 10 wt% microcapsule content for the compositions investigated. The diffusion of solvent through the crack interface and within fractured samples was investigated using analytical diffusion models. The decrease in healing efficiency at …
Epoxidation Of Cardanol's Terminal Double Bond., Emre Kinaci, Erde Can, John J La Scala, Giuseppe R Palmese
Epoxidation Of Cardanol's Terminal Double Bond., Emre Kinaci, Erde Can, John J La Scala, Giuseppe R Palmese
Henry M. Rowan College of Engineering Faculty Scholarship
In this investigation, the terminal double bonds of the side chain epoxidized cardanol glycidyl ether (SCECGE) molecule were further epoxidized in the presence of Oxone® (potassium peroxomonosulfate) and fluorinated acetone. Regular methods for the double bond epoxidation are not effective on the terminal double bonds because of their reduced electronegativity with respect to internal double bonds. The terminal double bond functionality of the SCECGE was epoxidized to nearly 70%, increasing the epoxy functionality of SCECGE from 2.45 to 2.65 epoxies/molecule as measured using proton magnetic nuclear resonance (1H-NMR). This modified material—side chain epoxidized cardanol glycidyl ether with terminal epoxies (TE-SCECGE)—was …
Formulation Of A Model Resin System For Benchmarking Processing-Property Relationships In High-Performance Photo 3d Printing Applications., Jianwei Tu, Kamran Makarian, Nicolas J Alvarez, Giuseppe R Palmese
Formulation Of A Model Resin System For Benchmarking Processing-Property Relationships In High-Performance Photo 3d Printing Applications., Jianwei Tu, Kamran Makarian, Nicolas J Alvarez, Giuseppe R Palmese
Henry M. Rowan College of Engineering Faculty Scholarship
A well-defined resin system is needed to serve as a benchmark for 3D printing of high-performance composites. This work describes the design and characterization of such a system that takes into account processability and performance considerations. The Grunberg–Nissan model for resin viscosity and the Fox equation for polymer Tg were used to determine proper monomer ratios. The target viscosity of the resin was below 500 cP, and the target final Tg of the cured polymer was 150 °C based on tan-δ peak from dynamic mechanical analysis. A tri-component model resin system, termed DA-2 resin, was determined and fully characterized. The …
Influence Of Epoxidized Cardanol Functionality And Reactivity On Network Formation And Properties., Emre Kinaci, Erde Can, John J La Scala, Giuseppe R Palmese
Influence Of Epoxidized Cardanol Functionality And Reactivity On Network Formation And Properties., Emre Kinaci, Erde Can, John J La Scala, Giuseppe R Palmese
Henry M. Rowan College of Engineering Faculty Scholarship
Cardanol is a renewable resource based on cashew nut shell liquid (CNSL), which consists of a phenol ring with a C15 long aliphatic side chain in the meta position with varying degrees of unsaturation. Cardanol glycidyl ether was chemically modified to form side-chain epoxidized cardanol glycidyl ether (SCECGE) with an average epoxy functionality of 2.45 per molecule and was cured with petroleum-based epoxy hardeners, 4-4'-methylenebis(cyclohexanamine) and diethylenetriamine, and a cardanol-based amine hardener. For comparison, cardanol-based diphenol diepoxy resin, NC514 (Cardolite), and a petroleum-based epoxy resin, diglycidyl ether of bisphenol-A (DGEBA) were also evaluated. Chemical and thermomechanical analyses showed that for …
High‐Tensile Strength, Composite Bijels Through Microfluidic Twisting, S. P. Kharal, Robert P. Hesketh, Martin F. Haase
High‐Tensile Strength, Composite Bijels Through Microfluidic Twisting, S. P. Kharal, Robert P. Hesketh, Martin F. Haase
Henry M. Rowan College of Engineering Faculty Scholarship
Rope making is a millennia old technique to collectively assemble numerous weak filaments into flexible and high tensile strength bundles. However, delicate soft matter fibers lack the robustness to be twisted into bundles by means of mechanical rope making tools. Here, weak microfibers with tensile strengths of a few kilopascals are combined into ropes via microfluidic twisting. This is demonstrated for recently introduced fibers made of bicontinuous interfacially jammed emulsion gels (bijels). Bijels show promising applications in use as membranes, microreactors, energy and healthcare materials, but their low tensile strength make reinforcement strategies imperative. Hydrodynamic twisting allows to produce continuous …