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 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...

In the title mol-ecule, C20H18N2O3, an intra-molecular N-H⋯O hydrogen bond leads to a cis conformation of the pyridinyl-vinyl fragment. The phenyl and pyridine rings are inclined to one another by 77.3 (1) °. In the crystal, mol-ecules are linked via pairs of C-H⋯O hydrogen bonds, forming inversion dimers. The dimers are linked by C-H⋯O hydrogen bonds and C-H⋯π inter-actions, forming a three-di...

Micro-capillaries with an engineered hidden surface were produced via the self-rolling of polymer thin films whose surface was photochemically modified so as to coat it with silver nanoparticles. The polymer films consisted of a poly(4-vinyl pyridine) (P4VP) layer topcoated with a polystyrene layer. When immersed in acid water, they underwent self-rolling due to selective swelling of the poly(4...