Nanoscale Fibrils and Grids:  Aggregated Structures from Rigid-Rod Conjugated Polymers

1999 ◽  
Vol 32 (5) ◽  
pp. 1500-1507 ◽  
Author(s):  
Jinsang Kim ◽  
Sean K. McHugh ◽  
Timothy M. Swager
Keyword(s):  
Conjugated Polymers ◽  
Rigid Rod

A Novel Class of Rigid-rod Perylene Diimides and Isoindigo Semiconducting Polymers

2021 ◽  
Author(s):  
Yaping Yu ◽  
Danlei Zhu ◽  
Xiuyuan Zhu ◽  
Mahesh kumar Ravva ◽  
Jiayao Duan ◽  
...  
Keyword(s):  
Double Bond ◽  
Conjugated Polymers ◽  
Optoelectronic Properties ◽  
Semiconducting Polymers ◽  
Perylene Diimides ◽  
Rigid Rod ◽  
Single Bonds

Rigid-rod conjugated polymers contain only double-bond linkers instead of single-bonds between the monomer linkages along the backbone. These polymers exhibit exceptional optoelectronic properties and promising devices performances owing to the...

Rigid Rod Conjugated Polymers for Nonlinear Optics. 2. Synthesis and Characterization of Phenylene−Ethynylene Oligomers

1996 ◽  
Vol 29 (1) ◽  
pp. 446-455 ◽  
Author(s):  
P. Wautelet ◽  
M. Moroni ◽  
L. Oswald ◽  
J. Le Moigne ◽  
A. Pham ◽  
...  
Keyword(s):  
Nonlinear Optics ◽  
Conjugated Polymers ◽  
Synthesis And Characterization ◽  
Phenylene Ethynylene ◽  
Rigid Rod

scholarly journals Charge transport physics of a unique class of rigid-rod conjugated polymers with fused-ring conjugated units linked by double carbon-carbon bonds

2021 ◽  
Vol 7 (18) ◽  
pp. eabe5280
Author(s):  
Mingfei Xiao ◽  
Remington L. Carey ◽  
Hu Chen ◽  
Xuechen Jiao ◽  
Vincent Lemaur ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Charge Transport ◽  
Molecular Design ◽  
High Electron ◽  
Design Strategies ◽  
Rigid Rods ◽  
Spin Resonance ◽  
Carbon Carbon Bonds ◽  
Rigid Rod ◽  
Chain Conformations

We investigate the charge transport physics of a previously unidentified class of electron-deficient conjugated polymers that do not contain any single bonds linking monomer units along the backbone but only double-bond linkages. Such polymers would be expected to behave as rigid rods, but little is known about their actual chain conformations and electronic structure. Here, we present a detailed study of the structural and charge transport properties of a family of four such polymers. By adopting a copolymer design, we achieve high electron mobilities up to 0.5 cm2 V−1 s−1. Field-induced electron spin resonance measurements of charge dynamics provide evidence for relatively slow hopping over, however, long distances. Our work provides important insights into the factors that limit charge transport in this unique class of polymers and allows us to identify molecular design strategies for achieving even higher levels of performance.

Rigid Rod Conjugated Polymers for Nonlinear Optics. 3. Intramolecular H Bond Effects on Poly(phenyleneethynylene) Chains

1997 ◽  
Vol 30 (7) ◽  
pp. 1964-1972 ◽  
Author(s):  
M. Moroni ◽  
J. Le Moigne ◽  
T. A. Pham ◽  
J.-Y. Bigot
Keyword(s):  
Nonlinear Optics ◽  
Conjugated Polymers ◽  
Rigid Rod

Exciton Migration in Rigid-Rod Conjugated Polymers:  An Improved Förster Model

2005 ◽  
Vol 127 (13) ◽  
pp. 4744-4762 ◽  
Author(s):  
Emmanuelle Hennebicq ◽  
Geoffrey Pourtois ◽  
Gregory D. Scholes ◽  
Laura M. Herz ◽  
David M. Russell ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Exciton Migration ◽  
Rigid Rod ◽  
Förster Model

Electronic structure studies of conducting polymers by electron energy-loss spectroscopy

1996 ◽  
Vol 54 ◽  
pp. 160-161
Author(s):  
J. Fink
Keyword(s):  
Electronic Structure ◽  
Conducting Polymers ◽  
Conjugated Polymers ◽  
Electron Acceptors ◽  
Electron Donors ◽  
Light Emitting ◽  
One Dimensional ◽  
New Class ◽  
Electrical Conductivities ◽  
Electron Energy Loss

Conducting polymers comprises a new class of materials achieving electrical conductivities which rival those of the best metals. The parent compounds (conjugated polymers) are quasi-one-dimensional semiconductors. These polymers can be doped by electron acceptors or electron donors. The prototype of these materials is polyacetylene (PA). There are various other conjugated polymers such as polyparaphenylene, polyphenylenevinylene, polypoyrrole or polythiophene. The doped systems, i.e. the conducting polymers, have intersting potential technological applications such as replacement of conventional metals in electronic shielding and antistatic equipment, rechargable batteries, and flexible light emitting diodes.Although these systems have been investigated almost 20 years, the electronic structure of the doped metallic systems is not clear and even the reason for the gap in undoped semiconducting systems is under discussion.

Morphology of High-Performance Rigid-Rod Polymer Fibers and Molecular Composites

1989 ◽  
Vol 47 ◽  
pp. 338-339
Author(s):  
W.W. Adams ◽  
S. J. Krause
Keyword(s):  
Tensile Strength ◽  
High Performance ◽  
Liquid Crystalline ◽  
Molecular Level ◽  
Synergistic Effects ◽  
Tensile Modulus ◽  
Commercial Development ◽  
The Matrix ◽  
Molecular Composites ◽  
Rigid Rod

Rigid-rod polymers such as PBO, poly(paraphenylene benzobisoxazole), Figure 1a, are now in commercial development for use as high-performance fibers and for reinforcement at the molecular level in molecular composites. Spinning of liquid crystalline polyphosphoric acid solutions of PBO, followed by washing, drying, and tension heat treatment produces fibers which have the following properties: density of 1.59 g/cm3; tensile strength of 820 kpsi; tensile modulus of 52 Mpsi; compressive strength of 50 kpsi; they are electrically insulating; they do not absorb moisture; and they are insensitive to radiation, including ultraviolet. Since the chain modulus of PBO is estimated to be 730 GPa, the high stiffness also affords the opportunity to reinforce a flexible coil polymer at the molecular level, in analogy to a chopped fiber reinforced composite. The objectives of the molecular composite concept are to eliminate the thermal expansion coefficient mismatch between the fiber and the matrix, as occurs in conventional composites, to eliminate the interface between the fiber and the matrix, and, hopefully, to obtain synergistic effects from the exceptional stiffness of the rigid-rod molecule. These expectations have been confirmed in the case of blending rigid-rod PBZT, poly(paraphenylene benzobisthiazole), Figure 1b, with stiff-chain ABPBI, poly 2,5(6) benzimidazole, Fig. 1c A film with 30% PBZT/70% ABPBI had tensile strength 190 kpsi and tensile modulus of 13 Mpsi when solution spun from a 3% methane sulfonic acid solution into a film. The modulus, as predicted by rule of mixtures, for a film with this composition and with planar isotropic orientation, should be 16 Mpsi. The experimental value is 80% of the theoretical value indicating that the concept of a molecular composite is valid.

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