The miscibility behavior in blends containing poly(4-vinyl pyridine) (P4VPy) and poly(2-vinyl pyridine) (P2VPy) as polymer components and the dihydric phenols 4,4’-thiodiphenol (TDP) and 4,4’-methylendiphenol (MDP) as low molecular weight compounds (LMWC), was studied by Differential Scanning Calorimetry (DSC) and Fourier Transform Infrared Spectrophotometry (FTIR) as main analytical techniques...

Earlier attempts at studying with the electron microscope the long chain polar polymers, of which deoxyribonucleic acid (DNA) is probably the most important example, appear to have been frustrated for want of a suitable substrate. On cast films of the conventional materials, formvar and nitro-cellulose, the greater part of the DNA is gathered together in a mass at the centre of the drop as it d...

The UV light-mediated metal-free polymerizations of 4-vinylpyridine (4VP) have been successfully performed by using 10-(pyren-1-yl)-10H-phenothiazine (PPTh) and pyrene as photocatalysts. preparation narrow polydispersity poly (4-vinyl pyridine) (P4VP) with high conversions was enabled in both protic well unprotic reaction media at ambient temperature. Additionally, copolymerizations 4VP acrylat...

The title compound, C(7)H(7)N·B(C(6)F(5))(3)·C(6)H(14), was obtained by the stoichiometric reaction of 2-vinyl-pyridine and tris-(penta-fluoro-phen-yl)borane in toluene. The formed adduct exhibits a restricted rotation along the B-N bond resulting in an asymmetry, which can be also observed in the (19)F NMR spectra. The B-N distance is equivalent to the distances found for 2-methyl-pyridine and...

Self-assembly of a binary mixture of poly(styrene)336-block-poly(4-vinyl pyridine)25 (PS336-b-P4VP25) and poly(ethylene glycol)113-block-poly(4-hydroxy styrene)25 (PEG113-b-P4HS25) is shown to give rise to a cylindrical morphology in thin films through pyridine/phenol-based hetero-complementary hydrogen bonding interactions between the P4VP and P4HS copolymer segments. Removal of the cylindrica...

In this work, the role of the disulfide bridges in the maintenance of the secondary structure of the antimicrobial peptides androctonin, polyphemusin-I, and thanatin is analyzed on the basis of their structural characteristics and of three of their respective mutants, andry4, poly4, and thany2, in which all the cysteine residues have been replaced with tyrosine residues. The absence of the disu...

In the present study, molecularly imprinted polymers were synthesized using caffeic acid (CA) as a template molecule and then used for extraction of CA chlorogenic (CLA) from complex matrices. Syntheses carried out in tetrahydrofuran porogenic solvent 4-vinyl pyridine, methacrylic acid, acrylamide, 1-vinyl imidazole monomers, ethylene glycol dimethacrylate crosslinker 2,2'-azobisisobutyronitril...

Synthesis and characterization of block copolymer PEG114-b-P4VP58 and PNIPAM93-b-P4VP58. Materials. Polyethylene glycol methyl ether (CH3O-PEG114-OH, Mn ~ 5000 and the polydispersity index, PDI = 1.05) was purchased from Fluka. The monomer 4-vinyl pyridine (Acros Organics, 95%) was purified by vacuum distillation. N-isopropylacrylamide (NIPAM, Acros Organics, 99%) was purified by recrystallizat...