نتایج جستجو برای: poly 4

تعداد نتایج: 1372880  

Journal: :Journal of chemical theory and computation 2015
S Sharma J K Dewhurst S Shallcross G K Madjarova E K U Gross

We apply the bootstrap kernel within time-dependent density functional theory to study the one-dimensional chain of polymer polyphenylenevinylene and molecular crystals of picene and pentacene. The absorption spectra of poly(p-phenylenevinylene) has a bound excitonic peak that is well-reproduced. Pentacene and picene, electronically similar materials, have remarkably different excitonic physics...

Journal: :Chemical communications 2011
Andrea Minoia Zongxia Guo Hong Xu S J George Albertus P H J Schenning Steven De Feyter Roberto Lazzaroni

Molecular modeling simulations reveal the role of stereogenic centers in the formation of enantiomorphous surface-confined supramolecular rosette-like assemblies in monolayers of oligophenylene vinylene oligomers adsorbed at the graphite/solvent interface.

Journal: :Chemical communications 2014
Benjamin J Lidster Jonathan M Behrendt Michael L Turner

Poly(p-phenylenevinylene)s (PPVs) with single reactive end groups have been prepared with high molecular weights, narrow polydispersities (ĐM) and excellent end functionality (f). PPVs functionalised with α-bromoester end groups are effective macroinitiators in the atom transfer radical polymerisation (ATRP) of methyl methacrylate (MMA).

Journal: :Chemical communications 2005
Youngmi Kim Timothy M Swager

Poly(p-phenylenevinylene)s containing trifluoromethyl substituted aromatic rings (CF3-PPVs) exhibit high photooxidative stability to give robust materials suitable for demanding applications.

Journal: :Polymer Chemistry 2022

Poly(2-hydroxyethyl acrylate)-poly(4-hydroxybutyl acrylate) nano-objects are prepared by aqueous polymerization-induced self-assembly (PISA) using an ionic RAFT agent.

Poly urea-formaldehyde was synthesized simply and rapidly from urea and formaldehyde by condensation polymerization and studied for the sorption of trace acid blue from aqueous solution. The optimum pH value for sorption of the acid blue was 4. Experimental results showed that the sorption capacity of poly urea-formaldehyde for acid blue was determined. The synthetic polymer can be reused for 5...

1997
Y. Park V.-E. Choong B. R. Hsieh C. W. Tang Y. Gao

We demonstrate that the gap states at the interface of Ca and a phenylene vinylene oligomer thin film are responsible for the dramatic quenching of its photoluminescence (PL). Upon oxidation of the Ca layer, the midgap states are removed, and the PL intensity recovers. From the cumulative Ca deposition and oxidation study, a 30 Å Ca oxide layer between the oligomer and the Ca metal prevents PL ...

Journal: :Chemical communications 2011
Hirotaka Ejima Kisei Matsumiya Toshiki Sawada Takeshi Serizawa

A peptide aptamer, which was originally identified by affinity screening for hyperbranched poly(phenylene vinylene) (hypPPV), functioned as an excellent dispersant for hypPPV nanoparticle formation.

Journal: :Chemical communications 2011
Subi J George Željko Tomović Albertus P H J Schenning E W Meijer

Preferred handedness in the supramolecular chirality of self-assembled achiral oligo(p-phenylenevinylene) (OPV) derivatives is induced by chiral solvents and spectroscopic probing provides insight into the mechanistic aspects of this chiral induction through chiral solvation.

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