Publications by authors named "Glenn A Spiering"
Poly(ether ether ketone) (PEEK) was found to form gels in the benign solvent 1,3-diphenylacetone (DPA). Gelation of PEEK in DPA was found to form an interconnected, strut-like morphology composed of polymer axialites. To our knowledge, this is the first report of a strut-like morphology for PEEK aerogels.
View Article and Find Full Text PDFCrystallization inhibitors in amorphous solid dispersions (ASD) enable metastable supersaturated drug solutions that persist for a physiologically relevant time. Olefin cross-metathesis (CM) has successfully provided multifunctional cellulose-based derivatives as candidate ASD matrix polymers. In proof of concept studies, we prepared hydrophobic bile salt/cellulose adducts by CM with naturally occurring bile salts.
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- This study investigates how the strength and distribution of pendant hydrogen bonds affect the self-assembly and properties of A-AB-A triblock copolymers.
- Using reversible addition-fragmentation chain transfer polymerization, researchers created a variety of these copolymers, incorporating cytosine-based units to study their thermomechanical behavior.
- Results indicated that variations in hydrogen bonding significantly influence microphase separation and mechanical properties, with stronger associations in the UCyA version leading to improved material performance compared to CyA.
Article Synopsis
- The aspect ratio (AR) of filler particles significantly influences the mechanical properties of particle-reinforced polymer composites, but studying its effects has been difficult due to challenges in controlling AR while keeping other properties constant.
- Researchers synthesized a zirconium-based metal-organic framework (MOF) named PCN-222 with controlled ARs ranging from 3.4 to 54, allowing the exploration of its mechanical reinforcement in poly(methyl methacrylate) (PMMA) composites without altering chemical properties.
- The study found that while both elastic and dynamic moduli increased with higher AR and particle concentrations, there was a decrease in mechanical properties at higher loading levels, with the Halpin-Tsai model well-fitting low loading data, and also
Quadruple Hydrogen Bonding Supramolecular Elastomers for Melt Extrusion Additive Manufacturing.
ACS Appl Mater Interfaces
July 2020
This manuscript describes the versatility of highly directional, noncovalent interactions, i.e., quadruple hydrogen bonding (QHB), to afford novel polyurea segmented supramolecular polymers for melt extrusion three-dimensional (3D) printing processes.
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