Synthesis of a polyurea from a glucose- or mannose-containingN-alkyl urea peptoid oligomer

Abstract

N-alkyl urea peptoid oligomers containing glucose or mannose have been synthesized and characterized. The oligomers were subsequently polymerized using a step-growth polymerization with hexamethylene diisocyanate. Equal moles of both monomers were used to guarantee high-molecular weight polymers. The polymers were characterized by gel permeation chromatography, nuclear magnetic resonance, and Fourier-transform infrared spectroscopy, and contact angle measurements of solvent cast thin films. Sulfation of the final polymers was achieved using a SO 3 =pyridine complex in pyridine to afford the heparin biomimetics. The average degree of sulfation was calculated to be 3.5 sulfates per saccharide as measured by elemental analysis.

High performance of phosphate-functionalized graphene oxide for the selective adsorption of U(VI) from acidic solution

“…The modification of GO with suitable functional groups [11] would reduce the self-aggregation and enhance its dispersion in aqueous solutions to improve its adsorption capacity toward pollutants. For example, Shao et al [12] grafted amidoxime on GO for the uptake of U(VI), due to the special adsorption capacity of amidoxime originated from its numerous hydroxyl and amino functional groups for heavy metal interaction.…”

Heparin-Mimicking Polymers: Synthesis and Biological Applications

“…100 (b) Hexamethylene diisocyanate-based isocyanates polymerized by step growth polymerization by Ayres and co-workers. 103 (c) Heptasulfate lactose-based glycopolymers polymerized by cyanoxal mediated polymerization by Chaikof and co-workers. 111 (d) Heparin mimicking polymers by ROMP to contain pendant disaccharides with three sulfates fabricated by Hsieh-Wilson and co-workers.…”

“…103 To do this, isopropylidene protected saccharide tetramers were synthesized with secondary amines on each end. The tetramers were then copolymerized with hexamethylene diisocyanate (HDI) via step growth polymerization to yield polymers with saccharide side chains.…”

Interactions Between Graphene Oxide and Rare Earth Metal Ion La(III)

“…GO can be used in many potential applications such as membranes for separation, energy conversion and storage, and structural composites. [22][23][24][25][26][27] Herein, rare earth ion La 3þ was introduced into GO nanosheet solutions to modify GO by bridging the sheets through coordinately bonding the oxygen-containing functional groups, especially the carboxyl groups at both the basal plane and the edges of the GO sheets. The hybrid GO/metal composite is very useful for control the metal ion density absorbed on the GO, and therefore controls mechanical property, electric conductivity and thermal conductivity as well as the energy storage density, etc.…”