Influence of the mode of synthesis on the morphology and structure of polyparaphenylene

Pradère, P.; Böudet, Alain M.

doi:10.1007/bf01132014

Cited by 13 publications

(6 citation statements)

References 21 publications

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“…PPP consists of chains of phenyl rings only. In the model surface, the polymer chains are placed nearly in one direction without cross-linking and we have confirmed that the constructed material has the known mass density =1.33 /cm 3 [10] of PPP in thermal equilibrium. Typical PPP substrates at 300K and 600K obtained from MD simulations are shown in Fig.…”

Section: Simulation Methodssupporting

confidence: 56%

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Atomic-Scale Analyses of Non-Equilibrium Surface Reactions During Plasma Processing

2007

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Molecular dynamics (MD) simulations are used to study nonthermal-equilibrium reaction dynamics taking place on the surface during dry etching processes. In MD simulations, the motion of each atom is solved numerically based upon pre-determined interatomic potential functions and data of interest (such as sputtering yields, deposition rates, etch products, etc.) are evaluated from statistical averaging of relevant instantaneous data obtained from the simulations. In this paper, we review our recent MD simulations results on organic polymer etching.

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Section: Simulation Methodssupporting

confidence: 56%

“…[8]]. Longer range ( 10 ) van der Waals interactions [9] are also taken into account among carbon atoms. Beams from the plasma are represented by carbon atoms, hydrogen atoms/molecules, or various hydrocarbon clusters CHx (x=1-4) vertically injected into the model polymer substrate.…”

Section: Simulation Methodsmentioning

confidence: 99%

Atomic-Scale Analyses of Non-Equilibrium Surface Reactions During Plasma Processing

2007

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“…The reported lattice parameters are rather disparate; however, the differences do not seem to be significant. 16 Whether the crystal structure is orthorhombic or monoclinic has been discussed by reference to polyphenyl oligomers. However, it is very difficult to draw a firm conclusion on this, since the PPP crystal involves considerable paracrystalline shift distortion along the chain axis.…”

Section: Ntro Duct10 Nmentioning

confidence: 99%

Crystal structure of poly(p‐phenylene) prepared by organometallic technique

Sasaki

Yamamoto

Kanbara

et al. 1992

J Polym Sci B Polym Phys

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The two‐dimensional crystal structure of poly(p‐phenylene) is investigated by linkedatom Rietveld analysis of the x‐ray diffraction powder profile. Two molecular chains are packed in a rectangular pgg unit cell (a = 0.779 nm; b = 0.551 nm) with a paracrystalline shift distortion along the chain axis. The molecular conformation is not rigidly planar; rotations between adjacent phenyl‐ring planes in a molecule alternate with an angle of about 20°. The setting angle between the mean molecular plane and the a axis is 55.5°.

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“…To achieve living CDSA of the D−A nanoribbons, we conducted a self-seeding strategy by dissolving the seed of PQX 20 -b-P3PT 20 (L n = 99 nm, L w /L n = 1.15) in 1,2- magnification TEM image (Figure 3e) from the PQX 30 -b-P3PT 30 nanoribbon (Figure S18 for shell DP 20) revealed a weak contrast attributed to the shell with each thickness of 12.6 nm, matching with the theoretical contour length of PQX 30 (30 × 0.43 nm = 12.9 nm). 45,46 In addition, TEM images obtained after staining the nanoribbons with RuO 4 vapor darkened the PQX shell, resulting in a significantly increased width up to 39.6 nm (PQX 30 -b-P3PT 30 ), consistent with the combined thickness of the core (14.2 nm) and shells (12.6 nm on each side = 25.2 nm) (Figure S19). Then, the self-seeding strategy was expanded to PBTz m -b-P3PT n BCPs showing 1D nanoribbons with different electronic characters.…”

Section: ■ Results and Discussionmentioning

confidence: 71%

Highly Efficient Preparation of Length and Width-Controllable Donor–Acceptor Nanoribbons via Polymerization-Induced Crystallization-Driven Self-Assembly of Fully Conjugated Block Copolymers

Kim,

Lee,

Hwang

et al. 2024

J. Am. Chem. Soc.

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Despite the high potential of one-dimensional (1D) donor−acceptor (D−A) coaxial nanostructures in bulk-heterojunction solar cell applications, the preparation of such 1D nanostructures using π-conjugated polymers has remained elusive. Herein, we demonstrate the first example of D−A semiconducting nanoribbons based on fully conjugated block copolymers (BCPs) prepared in a highly efficient procedure with controllable width and length via living crystallization-driven self-assembly (CDSA). Initially, Suzuki−Miyaura catalyst-transfer polymerization was employed to successfully synthesize BCPs containing two types of acceptor shells as the first block, followed by a donor poly(3propylthiophene) core as the second block. The limited solubility and high crystallinity of the core induced a polymerization-induced crystallization-driven self-assembly (PI-CDSA) of the BCPs into nanoribbons during polymerization, providing a tunable width (7.6−39.6 nm) depending on the length of the polymer backbone. Surprisingly, purifying as-synthesized BCPs via simple precipitation directly yielded short and uniform seed structures, greatly shortening the overall protocol by eliminating the timeconsuming process of initial aging and breaking down to the seed required for the conventional CDSA. With this new highly efficient method, we achieved length control over a broad range from 169 to 2210 nm, with high precision (L w /L n < 1.20). Furthermore, combining self-seeding and seeded growth from two different D−A-type BCPs enabled continuous living epitaxial growth from each end of the nanoribbons, resulting in B-A-B triblock D−A semiconducting comicelles with controlled length.

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Influence of the mode of synthesis on the morphology and structure of polyparaphenylene

Cited by 13 publications

References 21 publications

Atomic-Scale Analyses of Non-Equilibrium Surface Reactions During Plasma Processing

Atomic-Scale Analyses of Non-Equilibrium Surface Reactions During Plasma Processing

Crystal structure of poly(p‐phenylene) prepared by organometallic technique

Highly Efficient Preparation of Length and Width-Controllable Donor–Acceptor Nanoribbons via Polymerization-Induced Crystallization-Driven Self-Assembly of Fully Conjugated Block Copolymers

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