New NMR Approaches to the Study of Phase Separation in Polymer Solutions

Application of Ion - Imprinted Polymer Synthesized as New Sorbent for Preconcentration and Separation of Thallium (I) and Its Determination by Electrothermal Atomic Absorption Spectroscopy

At this study, thallium (I) ion-imprinted polymer, as a novel sorbent for Tl (I) and comparison with Tl(III) ion-imprinted polymer has been synthesized. This sorbent for preconcentration and solid-phase extraction of Tl(I) ions from aqueous solutions, used. Through preparing the binary complex of Tl(I) ions with 5, 7-dichloroquinoline-8-ol (DCQ) the particles of thallium (I) Ion-Imprinted P...

comparison between to versions of the SAFT EOS in the study of PVT and VLE phase behavior of pure polymer melts and binary polymer solutions

Phase-Destabilization Mechanism of Polymer-Modified Bitumens in Quiescent Annealing

Bitumen as a binder in coating and insulating materials is modified with polymers to improve its performance in service conditions. Almost all polymers are incompatible with bitumen, and at high temperatures due to relatively very low viscosity of the bitumen phase, are separated from it. These lead to a considerable limitation in the use and handling of polymer-modified bitumens. An understand...

Phase Separation in Water-Ethanol Polymer Solutions Studied by NMR Methods

We applied H and C NMR spectroscopy to investigate a phase transition and a cononsolvency effect of uncharged poly(N-isopropylmethacrylamide) (PIPMAm) and negatively charged PIPMAm copolymers in water/ethanol (D2O/EtOH) mixtures. For this purpose several PIPMAm solutions with various volume mixture compositions of D2O/EtOH (100/0 5/95 vol.-%) were prepared; sodium methacrylate was used as an io...

HPLC-SPE-NMR: a productivity tool in natural products research

Natural products provide excellent potential leads for drug development because of their chemical diversity and biological functionality. However, the productivity of discovery of new, pharmacologically active natural products has traditionally been low due to inherent difficulties and costs associated with extract dereplication, i.e., isolation, purification and structure elucidation of indivi...