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

A new approach to the preparation of molecularly imprinted polymers

U radu je opisana sinteza i polimerizacija akrilnih monomera koji imaju dicikloheksilureu (DCU) u bočnom lancu. Polimerizacijom akril-DCU s etilen-glikol dimetakrilatom (EDMA) do visoke konverzije, u butanonu s benzoil-peroksidom (Bz2O2), pri temperaturi od 70 °C sintetizirani su umreženi kopolimeri različitog sastava. Pri uvjetima kontrolirane termičke razgradnje u TG analizatoru, u temperaturnom području od 100 °C do 500 °C u struji dušika, kopolimeri se razgrađuju dvostupnjevitim mehanizmom. U prvom stupnju, od 180 °C do 250 °C, izdvaja se cikloheksilizocijanat. Ostatci nakon uklanjanja izocijanata termički su stabilni molekulski tiskani (nanoporozni) kopolimeri akril-cikloheksilamida (A-CHA) s EDMA, koji se razgrađuju u jednom stupnju pri temperaturi od 300 °C do 450 °C. Radi usporedbe svojstava molekulski tiskanih, nanoporoznih kopolimera poli(A-CHA-ko-EDMA) s odgovarajućim neporoznim kopolimerima, sintetizirani su neporozni kopolimeri A-CHA s EDMA pri navedenim uvjetima.This paper describes the synthesis and polymerization of acrylic monomers which contain dicyclohexylurea (DCU) as a pendant group. Crosslinked copolymers of these monomers with ethylene glycol dimethacrylate (EDMA) were prepared under the standard free radical initiated polymerization with dibenzoyl-peroxide (Bz2O2) as initiator, in butanone at 70 °C, up to high conversion. It was found that copolymers, regardless of the ratio of comonomers in the feed, thermally decompose by the two-step mechanism under the separation of almost quantitative yield of cyclohexylisocyanate, in the temperature range from 180 °C to 250 °C. The residues left by the removal of isocyanate were thermally stable crosslinked molecularly imprinted copolymers of acryl-cyclohexylamide (A-CHA) with EDMA, which decompose by a one-step mechanism between 300 °C and 450 °C. In order to compare the properties of nanoporous crosslinked copolymers of A-CHA with EDMA with those of nonporous poly(A-CHA-co-EDMA) of the same molar composition, nonporous copolymers were prepared by the polymerization of A-CHA with EDMA under the conditions described above

Synthesis and Spectroscopic Evidences of N-Arylmaleimides and N-Aryl-2,3-dimethylmaleimides

A series of N-arylmaleimides (N-aryl-MI) and N-aryl-2,3-dimethylmaleimides (N-aryl-DiMeMI) were prepared by condensation of primary amines with maleic anhydride (MAn) and 2,3-dimethylmaleic anhydride (DiMeMAn), respectively. Preparation of N-aryl-MI proceeded through the formation of N-arylmaleamic acid, which subsequently cyclized to N-aryl-MI. In the reaction of N-arylamines with DiMeMAn, cyclic condensation products were formed in one step. By means of one- and two-dimensional 1H and 13C NMR spectroscopy it was proven that Naryl- DiMeMI and not isomaleimides were formed by a one step reaction

Recommendations for Stroke Management 2006 Update

This article brings an update of the Recommendations for Stroke Management, first published in this journal in 2001. The Recommendations are consistent with the Recommendations of three European societies represented Iri the European Stroke Initiative: the European Stroke Council, the European Neurological Society, and the European federation of Neurological Societies, and are in concordance with the Guidelines of the American Heart Association/American Stroke Association Council on Stroke, approved by the American Academy of Neurology. The Recommendations have been endorsed by the Croatian Society for Neurovascular Disorders of Croatian Medical Association, Croatian Stroke Society, and University Department of Neurology, Sestre milosrdnice University Hospital, Reference Center for Neurovascular Disorders of the Croatian Ministry of Health

Water for all : Proceedings of the 7th international scientific and professional conference Water for all

The 7th International Scientific and Professional Conference Water for all is organized to honour the World Water Day by the Josip Juraj Strossmayer University of Osijek, European Hygienic Engineering & Design Group (EHEDG), Danube Parks, Croatian Food Agency, Croatian Water, Faculty of Food Technology Osijek, Faculty of Agriculture in Osijek, Faculty of Civil Engineering Osijek, Josip Juraj Strossmayer University of Osijek Department of Biology, Josip Juraj Strossmayer University of Osijek Department of Chemistry, Nature Park “Kopački rit”, Osijek- Baranja County, Public Health Institute of the Osijek- Baranja County and „Vodovod-Osijek“ -water supply company in Osijek. The topic of World Water Day 2017 was "Wastewater" emphasizing the importance and influence of wastewater treatments on global environment. The international scientific and professional conference Water for all is a gathering of scientists and experts in the field of water management, including chemists, biologists, civil and agriculture engineers, with a goal to remind people about the significance of fresh water and to promote an interdisciplinary approach and sustainability for fresh water resource management. The Conference has been held since 2011. About 300 scientists and engineers submitted 95 abstracts to the 7th International Scientific and Professional Conference Water for all, out of which 33 was presented orally and 62 as posters. 47 full papers were accepted by the Scientific Committee. 38 full papers became the part of the this Proceedings while 9 papers were accepted for publication in Croatian Journal of Food Science and Technology and Electronic Journal of the Faculty of Civil Engineering Osijek - e-GFOS

Book Reviews

Dr. Jerrold M. Grochow is the Chief Technology Officer and Director of the Center for Advanced Technologies at American Management Systems of Fairfax, VA. He is also a consultant to many clients in business and governments around the world, helping them to create strategic business systems utilizing the newest information technology. He is author of "SAA: Implementing IBM\u27s System Application Architecture" (Yourdon Press, 1991) and has written for Computerworld, PC Week, CIO Magazine and Software Magazine

Book Reviews

Dr. Jerrold M. Grochow is the Chief Technology Officer and Director of the Center for Advanced Technologies at American Management Systems of Fairfax, VA. He is also a consultant to many clients in business and governments around the world, helping them to create strategic business systems utilizing the newest information technology. He is author of "SAA: Implementing IBM\u27s System Application Architecture" (Yourdon Press, 1991) and has written for Computerworld, PC Week, CIO Magazine and Software Magazine