The synthesis and application of molecularly imprinted polymers

U radu je dan pregled najnovijih spoznaja i trendova iz područja molekulski tiskanih polimera (imprintni polimeri). Prikazani su osnovni postupci sinteze s posebnim osvrtom na primjenu u području ekstrakcije na krutoj fazi, razdvajanja enantiomera, u tekućinskoj kromatografiji visoke djelotvornosti i tankoslojnoj kromatografiji.The paper reviews the current state and trends in molecular imprinting. The basic methods for the preparation of imprinted polymers are presented, with particular emphasis on the application of the crosslinked imprinted polymers in solid state extraction, chiral separations, high performance liquid chromatography and thin layer chromatography

The influence of the chemical structure on the properties of molecularly imprinted crosslinked polymers

U radu je opisana sinteza monomera N-metakril-N,N\u27-dicikloheksiluree (MA-DCU) i N-metakril-N,N\u27-diizopropiluree (MA-DiPrU) te polimerizacija s etilen-glikol dimetakrilatom (EDMA). Polimerizacija je provedena u butanonu s benzoil-peroksidom (Bz2O2) do visoke konverzije. Dobiveni su umreženi kopolimeri netopljivi u organskim otapalima. Neovisno o sastavu, kopolimeri se razgrađuju dvostupnjevitim mehanizmom pri temperaturama od 180 °C do 450 °C uz izdvajanje cikloheksilizocijanata (C6H11NCO), odnosno izopropilizocijanata (C3H7NCO) pri temperaturi od 180 °C do 250 °C. Ostatak nakon izdvajanja izocijanata je termički stabilan nanoporozni umreženi kopolimer metakril-cikloheksilamida (MA-CHA), odnosno metakril-izopropilamida (MA-iPrA) s EDMA. Ti se kopolimeri razgrađuju u jednom stupnju pri temperaturama od 280 °C do 450 °C. Sintetizirani su i neporozni kopolimeri MA-CHA, odnosno MA-iPrA s EDMA (modelni kopolimeri) radi usporedbe svojstava s odgovarajućim nanoporoznim kopolimerima.The present paper describes the synthesis of monomers N-methacryl-N,N’-dicyclohexylurea (MA-DCU) and N-methacryl-N,N’-diisopropylurea (MA-DiPrU) and their polymerization with ethylene glycol dimethacrylate (EDMA). Polymerization were carried out in butanone by using dibenzoyl-peroxide (Bz2O2) up to high conversion. All prepared copolymers are insoluble in common organic solvent. Crosslinked copolymers decompose thermally at temperatures from 180 °C to 450 °C under the separation of cyclohexylisocyanate (C6H11NCO) or isopropylisocyanate (C3H7NCO) at temperature between 180 °C and 250 °C. Residues after the removal of isocyanate are thermally stable nanoporous crosslinked copolymers of methacryl-cyclohexylamide (MA-CHA) or methacryl-isopropylamide (MA-iPrA) with EDMA, which decompose by a one-step mechanism between 280 °C and 450 °C. Nonporous model copolymers of MA-CHA and MA-iPrA with EDMA were also prepared in order to compare their properties with the properties of corresponding nanoporous copolymers

Correlation and prediction of phase behavior of polymer blends

U radu su prikazani principi koreliranja i predviđanja fazne ravnoteže polimernih mješavina na osnovi derivata stirena i poli(fenilen oksida) primjenom teorije osrednjenog polja. Opisano je određivanje segmentnih interakcijskih parametara i korelacija faznog ponašanja. Prikazani su rezultati predviđanja mješljivosti primjenom navedenog modela te vlastite sugestije o izboru metode doprinosa atomskih skupina. Proračuni dobiveni na osnovi segmentnih interakcijskih parametara pokazuju odlično slaganje s eksperimentalnim podatcima.Principles of correlation and prediction of phase equilibria of polymer blends applying a mean-field theory are presented and described in examples of various polymer blends based on styrene and 2,6-dimethyl-phenylene oxide derivatives. The estimation of segmental interaction parameters, as well as the correlation of phase behavior, is explained. The predictive capability of the model is shown and our suggestions about the choice of the group-contribution method are made. Calculations based on estimated segmental interaction parameters are in excellent agreement with the experimental data