Dominic V Mcgrath
Publications
Abstract:
Azobenzene-containing shape-persistent dendrimers were synthesized to address the effect of the dendrimer subunit on the behavior of well-defined systems. The resulting dendrimers have rigid structures with phenylacetylene subunits. The properties of the dendrimers allow comparison with previously-prepared flexible azobenzene-containing dendrimers.
Abstract:
We present a modular synthesis of a new class of chiral N,N-chelating ligands containing the C2-symmetric trans-2,5-disubstituted pyrrolidine moiety linked to a pyridine ring. (-)-2-[(2R,5R)-2,5-Dimethylpyrrolidin-1-ylmethyl]pyridine (11, (R,R)-MePMP), (-)-2-[2((2R,5R)-2,5-dimethylpyrrolidin- (12, (R,R)-MePEP), and (+)-2-[(2R,5R)-2,5-diphenylpyrrolidin-1-ylmethyl]pyridine (13, (R,R)-PhPMP) have been prepared. The X-ray structure of the (Λ3-allyl)Pd complex of (R,R)-MePMP (11) is reported.
Abstract:
Electroactuated polymer (EAP) hydrogels based on JEFFAMINE® T-403 and ethylene glycol glycidyl ether (EGDGE) are used in an infusion pump based on the proprietary Pulse Actuated Cell System (PACS) architecture in development at Medipacs LLC. We report here significant progress in optimizing the formulation of the EAP hydrogels to dramatically increase hydrolytic stability and reproducibility of actuation response. By adjusting the mole fraction of reactive components of the formulation and substituting higher molecular weight monomers, we eliminated a large degree of the hydrolytic instability of the hydrogels, decreased the brittleness of the gel, and increased the equilibrium swelling ratio. The combination of these two modifications to the formulation resulted in hydrogels that exhibited reproducible swelling and deswelling in response to pH for a total period of 10-15 hours.