Synthesis and Solid-State Investigations of Oligo-Phenylene-Ethynylene Structures with Halide End-Groups

2012 ◽  
Vol 2012 (14) ◽  
pp. 2738-2747 ◽  
Author(s):  
Nicolas M. Jenny ◽  
Hong Wang ◽  
Markus Neuburger ◽  
Harald Fuchs ◽  
Lifeng Chi ◽  
...  
Keyword(s):  
Solid State ◽  
Phenylene Ethynylene ◽  
End Groups

Advancing conjugated polymers into nanometer-scale devices

2006 ◽  
Vol 78 (10) ◽  
pp. 1803-1822 ◽  
Author(s):  
Wenping Hu ◽  
Hiroshi Nakashima ◽  
Erjing Wang ◽  
Kazuaki Furukawa ◽  
Hongxiang Li ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Molecular Level ◽  
Nanometer Scale ◽  
Transport Mechanisms ◽  
Phenylene Ethynylene ◽  
Polymer Molecules ◽  
Polymer Electronics ◽  
End Groups

In this article, we review the possibility of combining conjugated polymers with nanometer-scale devices (nanodevices), in order to introduce the properties associated with conjugated polymers into such nanodevices. This approach envisages combining the highly topical disciplines of polymer electronics and nanoelectronics to engender a new subdirection of polymer nanoelectronics, which can serve as a tool to probe the behavior of polymer molecules at the nanometer/molecular level, and contribute to clarifying transport mechanisms in conjugated polymers. In this study, we exemplify this combination, using a family of linear and conjugated polymers, poly(p-phenylene-ethynylene)s (PPEs) with thiolacetate-functionalized end groups.

scholarly journals Solid-State Polymerization of Poly(Ethylene Furanoate) Biobased Polyester, III: Extended Study on Effect of Catalyst Type on Molecular Weight Increase

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 438 ◽  
Author(s):  
Yosra Chebbi ◽  
Nejib Kasmi ◽  
Mustapha Majdoub ◽  
George Papageorgiou ◽  
Dimitris Achilias ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Thermal Properties ◽  
Solid State ◽  
Intrinsic Viscosity ◽  
Weight Increase ◽  
Degree Of Crystallinity ◽  
Solid State Polymerization ◽  
End Groups ◽  
Poly Ethylene ◽  
Molecular Weight Increase

In this study, the synthesis of poly(ethylene furanoate) (PEF), catalyzed by five different catalysts—antimony acetate (III) (Sb Ac), zirconium (IV) isopropoxide isopropanal (Zr Is Ip), antimony (III) oxide (Sb Ox), zirconium (IV) 2,4-pentanedionate (Zr Pe) and germanium (IV) oxide (Ge Ox)—via an industrially common combination of melt polymerization and subsequent solid-state polymerization (SSP) is presented. In all reactions, proper amounts of 2,5-dimethylfuran-dicarboxylate (DMFD) and ethylene glycol (EG) in a molar ratio of DMFD/EG= 1/2 and 400 ppm of catalyst were used. Polyester samples were subjected to SSP procedure, under vacuum application, at different reaction times (1, 2, 3.5, and 5 h) and temperatures of 190, 200, and 205 °C. Carboxyl end-groups concentration (–COOH), intrinsic viscosity (IV), and thermal properties, via differential scanning calorimetry (DSC), were measured for all resultant polymers to study the effect of the used catalysts on the molecular weight increase of PEF during SSP process. As was expected, it was found that with increasing the SSP time and temperature, the intrinsic viscosity and the average molecular weight of PEF steadily increased. In contrast, the number of carboxyl end-groups content showed the opposite trend as intrinsic viscosity, that is, gradually decreasing during SSP time and temperature increase. It is worthy to note that thanks to the SSP process an obvious and continuous enhancement in the thermal properties of the prepared PEF samples was attained, in which their melting temperatures (Tm) and degree of crystallinity (Xc) increase progressively with increasing of reaction time and temperature. To predict the time evolution of polymers IV, as well as the hydroxyl and carboxyl content of PEF polyesters during the SSP, a simple kinetic model was developed. From both the theoretical simulation results and the experimental measurements, it was demonstrated that surely the Zr Is Ip catalyst shows the best catalytic characteristics compared to all other used catalysts herein, that is, leading in reducing—in a spectacular way—the activation energy of the involved both transesterification and esterification reactions during SSP.

Solid-State Chiral Supramolecular Organic Fluorophore Having a π-Conjugated Phenylene Ethynylene Unit

2009 ◽  
Vol 2009 (33) ◽  
pp. 5760-5764 ◽  
Author(s):  
Takafumi Kinuta ◽  
Kensaku Kamon ◽  
Takunori Harada ◽  
Yoko Nakano ◽  
Nobuo Tajima ◽  
...  
Keyword(s):  
Solid State ◽  
Phenylene Ethynylene ◽  
Organic Fluorophore

Temperature dependence of charge transport in solid-state molecular junctions based on oligo(phenylene ethynylene)s

2020 ◽  
Vol 31 (16) ◽  
pp. 164001
Author(s):  
Yuqing Liu ◽  
Mianzeng Zhong ◽  
Elisabeth Ffion Downey ◽  
Xiaoyao Chen ◽  
Tao Li ◽  
...  
Keyword(s):  
Solid State ◽  
Charge Transport ◽  
Temperature Dependence ◽  
Molecular Junctions ◽  
Phenylene Ethynylene

scholarly journals Synthesis, characterization and solid-state photoluminescence studies of six alkoxy phenylene ethynylene dinuclear palladium(ii) rods

2015 ◽  
Vol 44 (9) ◽  
pp. 4003-4015 ◽  
Author(s):  
João Figueira ◽  
Wojciech Czardybon ◽  
José Carlos Mesquita ◽  
João Rodrigues ◽  
Fernando Lahoz ◽  
...  
Keyword(s):  
Solid State ◽  
Emission Intensity ◽  
Phenylene Ethynylene ◽  
Pd Complexes ◽  
Photoluminescence Studies

Solid-state photoluminescence studies of six dinuclear [PdCl(PEt3)2]) rods revealed a decrease in the emission intensity when moving from the free ligands to the Pd complexes.

Nondestructive Analysis of Lignin Structure by NMR Spectroscopy of Specifically 13C-Enriched Lignins. Part 1. Solid State Study of Ginkgo Wood

Holzforschung ◽  
2002 ◽  
Vol 56 (1) ◽  
pp. 43-50 ◽  
Author(s):  
Noritsugu Terashima ◽  
Jonas Hafrén ◽  
Ulla Westermark ◽  
D. L. VanderHart
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Cell Walls ◽  
Coniferyl Alcohol ◽  
Side Chain ◽  
Nondestructive Analysis ◽  
Difference Spectra ◽  
State Study ◽  
End Groups ◽  
Signal Intensities

Summary Guaiacyl-type lignin is the major component of ginkgo lignin. Specific 13c-enrichment of α, β and γ-carbons of the guaiacylpropane side chains was achieved by administration of coniferin-[α13C], coniferin-[β-13C] and coniferin-[γ13C], respectively, to growing stems of ginkgo trees. Unenriched coniferin was administered as a control. The xylem tissues containing specifically 13C-enriched lignins or unenriched lignin were subjected to analysis by solid state NMR. Subtraction of the spectrum of tissue containing unenriched lignin from the spectra of tissues containing 13C-enriched lignins gave difference spectra exclusively assigned to the enriched side chain carbons of intact protolignin in the cell walls. From the signal intensities determined under quantitative conditions and an estimate of corresponding standard uncertainties, the percentage ranges of the major inter-unit lignin bonds originating from the β-carbon of the coniferin precursor were estimated to be: β-O-4/α-O-R (R = H, polysaccharides or lignols) including β-OH, 53% to 57%; combined β-5, β-β and β-1, 32% to 36%; coniferaldehyde end groups, 2% to 4%; and coniferyl alcohol end groups, 4% to 6%.

Supramolecular Organization of Oligo(m-phenylene ethynylene)s in the Solid-State

1999 ◽  
Vol 121 (25) ◽  
pp. 5933-5939 ◽  
Author(s):  
Peggy-Jean Prest ◽  
Ryan B. Prince ◽  
Jeffrey S. Moore
Keyword(s):  
Solid State ◽  
Supramolecular Organization ◽  
Phenylene Ethynylene

Hexagonal Packing of Oligo(m-phenylene ethynylene)s in the Solid State:  Helical Nanotubules

2000 ◽  
Vol 122 (25) ◽  
pp. 6134-6135 ◽  
Author(s):  
Matthew J. Mio ◽  
Ryan B. Prince ◽  
Jeffrey S. Moore ◽  
Christian Kuebel ◽  
David C. Martin
Keyword(s):  
Solid State ◽  
Phenylene Ethynylene ◽  
Hexagonal Packing
Sign in / Sign up

Export Citation Format

Share Document