A5034127624- Fuel Cells and Related Materials
- Polymer crystallization and properties
- Advanced Battery Materials and Technologies
- Synthesis and properties of polymers
- Polymer Nanocomposites and Properties
- Membrane-based Ion Separation Techniques
- Electrocatalysts for Energy Conversion
- Membrane Separation and Gas Transport
- Conducting polymers and applications
- Advanced Sensor and Energy Harvesting Materials
- Polymer composites and self-healing
- biodegradable polymer synthesis and properties
- Analytical Chemistry and Sensors
- Block Copolymer Self-Assembly
- Tribology and Wear Analysis
- Silicone and Siloxane Chemistry
- Electrospun Nanofibers in Biomedical Applications
- High-Velocity Impact and Material Behavior
- Software System Performance and Reliability
- Mechanical Behavior of Composites
- Polymer Foaming and Composites
- Environmental Chemistry and Analysis
- Polysaccharides and Plant Cell Walls
- Composite Material Mechanics
- Automotive and Human Injury Biomechanics
DEVCOM Army Research Laboratory
2004-2025
Drexel University
2005
University of Pennsylvania
2005
Transport properties of sulfonated poly(styrene-b-isobutylene-b-styrene) (S-SIBS) triblock copolymers were examined as a function ion-exchange capacity (IEC), specifically at high IECs (up to ∼2 mequiv/g). The proton conductivity S-SIBS was ∼1 order magnitude higher than polystyrene similar and 3-fold Nafion 117 an IEC 2 mequiv/g. However, all polymers in this study possessed selectivities (i.e., conductivity/methanol permeability) regardless chemistry or morphology. Small-angle X-ray...
Abstract The effect of clay loading on the mechanical behavior and melt state linear viscoelastic properties intercalated polycarbonate (PC) nanocomposites was investigated. At low frequencies, dynamic oscillatory moduli data revealed diminished frequency dependence with increasing nanoclay loading. 3.5 5 wt% exhibited dramatically altered relaxation behavior, from liquid‐like to pseudo‐solid–like, compared pure PC 1.5 nanocomposite. Thermal degradation resulted compounding organo‐modified...
ABSTRACT Interfacial polymerization is used to prepare biobased furan polyamides from the carbohydrate‐derived monomer, 2,5‐furan dicarboxylic acid, aromatic diamines, and varying chain length aliphatic diamines. The molecular weights of variations range 10,000–70,000 g/mol. These have improved solubility relative petroleum‐derived affording enhanced processability options. glass transition temperatures ( T g ) are higher than that analogs, but lower phenyl‐aromatic analogs. for these as...
A great challenge to the utilization of bioderived cellulose nanofibrils (CNFs) is related dispersion, where hydrophilic nature makes them difficult disperse in both organic solvents and hydrophobic polymers. In this study, an amphiphilic diblock copolymer, poly(methyl methacrylate-b-acrylic acid) (PMMA-b-PAA), which contains a short interactive block PAA long PMMA, was utilized modify surface CNFs covered with carboxylic acid groups (CNF-COOH). The binds on through formation multiple...
ABSTRACT In this study, the mechanical and chemical properties of a series sulfonated poly(styrene‐isobutylene‐styrene) (SIBS) block copolymers were evaluated using combination nanoindentation, dynamic analysis (DMA), elemental (EA), Fourier transform infrared spectroscopy (FTIR), water absorption, small angle X‐ray scattering studies (SAXS). The materials characterized as function sulfonation percent in copolymers, well result counter‐ion substitution with Mg 2+ , Ca Ba . Nanoindentation...
Polymers formed by ring-opening metathesis polymerization (ROMP) such as poly(dicyclopentadiene) (pDCPD) exhibit a technologically desirable combination of high toughness, glass transition temperature, and outstanding low-temperature performance. However, because their nonpolar molecular structure, they tend to suffer from relatively low elastic moduli poor adhesion common fillers, fibers, substrates, limiting utility adhesives composite binders without specialized bonding agents. Here, we...
An important class of thermoplastic elastomers involves polystyrene and polyisobutylene blocks (SIBS). Sulfonated SIBS Triblock Copolymers (S-SIBS) are particular interest because potential applications for fuel cell textile applications, where breathable, protective clothing is required. We have used multiscale modeling to gain an understanding the static dynamic properties these polymer systems at detailed atomistic levels. Quantum chemistry tools were elucidate bonding water molecules...
Significant moisture uptake was observed for a family of catechol side-chain poly(alkyl acrylate-maleimide)s (<bold>PAMs</bold>) intended to probe the effects <italic>T</italic><sub>g</sub> and polarity.
Abstract A series of transparent methacrylate‐based crosslinked polymer networks are prepared in which the crosslinker length is controlled as a means to investigate effects network ductility on mechanical and ballistic properties. In each optical clarity pure poly(methyl methacrylate) (PMMA) retained, well low value haze. Both glass transition temperature ( T g ) tensile modulus highly tunable, with values both above below that PMMA or network. The performance likewise affected, up 400%...