Highly Regular Organization of Conjugated Polymer Chains via Block Copolymer Self-Assembly

Leclère, Philippe; Calderone, A.; Marsitzky, D.; Francke, Viola; Geerts, Yves; Müllen, Kläus; Brédas, Jean‐Luc; Lazzaroni, Roberto

doi:10.1002/1521-4095(200007)12:14<1042::aid-adma1042>3.0.co;2-j

Cited by 131 publications

(119 citation statements)

References 8 publications

Supporting

Mentioning

115

Contrasting

Unclassified

Order By: Relevance

“…3a) similar to that previously reported for poly(p-phenylene ethynylene)-and poly(p-phenylene)-based copolymers. [7] This morphology is thought to originate from regular assembling of the conjugated segments via p-stacking, which leads to the formation of long thin ribbons that then collect into bundles. Since the films are rather thick (a few hundreds of nanometers), the substrate plays no part in the formation of the fibrils, which are then randomly orientated on the surface.…”

Section: Resultsmentioning

confidence: 99%

Correlation Between Molecular Structure, Microscopic Morphology, and Optical Propertiesof Poly(tetraalkylindenofluorene)s

et al. 2002

Self Cite

View full text Add to dashboard Cite

The emission properties of polyindenofluorenes with various proportions of straight‐ and branched‐chain alkyl substituents have been compared. The polymer with straight octyl substituents shows green emission due to formation of aggregates, while the polymer with branched 2‐ethylhexyl substituents shows blue emission. Studies of the film morphology show the presence of ordered structures due to π‐stacking of the polymer chains for the octyl‐substituted polymer, whereas the polymer with branched side‐chains shows no such order. Copolymers show intermediate behavior. A clear correlation is established between the degree of straight‐chain alkyl substitution, the formation of ordered structures in the films, and the amount of long wavelength emission in the solid‐state spectra.

show abstract

Section: Resultsmentioning

confidence: 99%

Correlation Between Molecular Structure, Microscopic Morphology, and Optical Propertiesof Poly(tetraalkylindenofluorene)s

et al. 2002

Self Cite

View full text Add to dashboard Cite

show abstract

“…We note that the proton resonance at 3.05 and 2.82 ppm are characteristic of a-methylene protons in head-to-tail linkage of 3-alkylthiophene units whereas the proton resonance at 2.59 ppm is characteristic of a-methylene protons in head-to-head or tail-to-tail linkage shown in Figure S1. Poly(3-cyclohexylthiophene) (P3cHT) Butylmagnesium chloride (2 M solution in THF, 4.8 mL, 9.6 mmol) was added into a solution of 2,5-dibromo-3-cyclohexylthiophene (3.16 g, 9.8 mmol) in anhydrous THF (40 mL) at [10][11][12][13][14][15] C, and purged with N 2 . The solution was degassed and purged upon stirring for 30 min at 10-15 C, then heated at mild reflux for 1 h. Reflux is stopped before the addition of Ni(dppe)Cl 2 (36.2 mg, 0.068 mmol) and then the mixture was refluxed for at least 24 h. The mixture was cooled to room temperature and poured into methanol to form a precipitate.…”

Section: Polymer Synthesis Poly(3-hexylthiophene)-block-poly(3-cyclohmentioning

confidence: 99%

“…INTRODUCTION Multicomponent-conjugated polymer systems, especially polymer blends [1][2][3][4][5][6][7] and block copolymers, [8][9][10][11][12][13][14][15][16][17][18][19][20] offer the opportunity to tailor their electronic and optical properties to levels well beyond those possible in homopolymers and random/alternating copolymers. Most polythiophene-based multicomponent conjugated polymer systems investigated so far have been based on poly(3-hexylthiophene) (P3HT), 1,27,28 which is known to be a high mobility p-type polymer semiconductor 29,30 and a good donor component in fullerene-based bulk heterojunction (BHJ) solar cells.…”

mentioning

confidence: 99%

Poly(3‐hexylthiophene)‐b‐poly(3‐cyclohexylthiophene): Synthesis, microphase separation, thin film transistors, and photovoltaic applications

Ren

Kim

et al. 2009

J. Polym. Sci. A Polym. Chem.

View full text Add to dashboard Cite

ABSTRACT:We report the synthesis, characterization, microphase separation, field-effect charge transport, and photovoltaic properties of regioregular poly(3-hexylthiophene)-bpoly(3-cyclohexylthiophene) (P3HT-b-P3cHT). Two compositions of P3HT-b-P3cHT (HcH63 and HcH77) were synthesized with weight-average molecular weights of 155,500 and 210,800 and polydispersity indices of 1.45 and 1.57, respectively. Solvent-casted HcH77 was found to self-assemble into nanowires with a width of 12.5 6 0.9 nm and aspect ratios of 50-120, as observed by TEM imaging. HcH77 and HcH63 annealed 280 C were observed by small angle X-ray scattering (SAXS) and wide angle X-ray scattering (WAXS) to be microphase-separated with characteristic length scales of 17.0-21.7 nm. The microphase-separated domains were shown to be crystalline with interlayer backbone (

show abstract

“…9,10 microphase-separation of block copolymers. 11,12 The templates employed in the methods are often sacrificial, though they are not readily produced. [13][14][15][16] Recently, a breath figures (BF) method in which water droplets act as easily available templating medium draws increasing interests.…”

mentioning

confidence: 99%

“…5,6 A variety of templating methods have been developed to create ordered pores with dimensions of tens to thousands of nanometers, such as colloidal crystals, 7,8 selfassembly of emulsions or surfactants, 9,10 microphase-separation of block copolymers. 11,12 The templates employed in the methods are often sacrificial, though they are not readily produced. [13][14][15][16] Recently, a breath figures (BF) method in which water droplets act as easily available templating medium draws increasing interests.…”

mentioning

confidence: 99%

Honeycomb-Structured Porous Films Controlled by the Temperature of Water Bath

Zhang

et al. 2008

Polym J

View full text Add to dashboard Cite

The highly ordered porous films were fabricated from the solution of polystyrene with one carboxyl terminal group in carbon disulfur in a chamber with a water bath. It is found that the pore size can be readily controlled by changing the temperature of water bath. The pore size increases with an increase in the water-bath temperature in a given range. And the porous film from the ''dilute'' solution can be readily formed even at a low relative humidity (RH), while the porous film from the ''concentrated'' solution can be fabricated only at a rather high RH. The regularity of porous film becomes better at the higher RH and higher concentration. It suggests that there exists a synergetic effect of solution concentration and RH on the formation of porous film. These phenomena are explained by the slow evaporation rate of the solvent under the conditions. 9,10 microphase-separation of block copolymers. 11,12 The templates employed in the methods are often sacrificial, though they are not readily produced. [13][14][15][16] Recently, a breath figures (BF) method in which water droplets act as easily available templating medium draws increasing interests. [17][18][19] In this method, the evaporation of solvent in polymer solution leads to a decrease in the temperature of solution surface, and water vapor starts to condense onto the cold solution surface to form water droplets. And then the water droplets are packed by the precipitated polymers and self-assembled into a BF array. Upon further evaporation of solvent and water, the ordered porous structure is effectively locked in place. 17 The morphology of pores mocking the water droplets can be readily controlled by varying the process conditions (such as relative humidity, concentration and airflow rate across the polymeric solution surface, etc.) and the types of materials used. 17,[19][20][21][22] The basic techniques related to BF method also markedly affected the formation of pores. In the airflow technique, an airflow parallelly across the solution surface results in cooling of solution surface due to fast evaporation of the solvent, which is beneficial to formation of highly ordered porous film and widely used in BF method. 19,20,23 Recently, Li et al. 24developed a new method that the airflow blew across the solution surface along the direction having a small angle with respect to the normal of the solution surface. The shape of the pores could be controlled, that is, elliptical pore morphology with different aspect ratios was obtained. Stenzel et al. 25switched the airflow from parallel to vertical stream, better porous size control over the whole film surface was achieved, but at the cost of regularity of the film. In the above techniques, the airflow containing a certain amount of moisture, which is often additionally fed, played a key role in inducing a decrease in solution temperature and the formation of ordered porous film. Bormashenko et al.26,27 employed a fast dip-coating technique to fabricate porous film on different solid substrates. They found tha...

show abstract

Highly Regular Organization of Conjugated Polymer Chains via Block Copolymer Self-Assembly

Cited by 131 publications

References 8 publications

Correlation Between Molecular Structure, Microscopic Morphology, and Optical Propertiesof Poly(tetraalkylindenofluorene)s

Correlation Between Molecular Structure, Microscopic Morphology, and Optical Propertiesof Poly(tetraalkylindenofluorene)s

Poly(3‐hexylthiophene)‐b‐poly(3‐cyclohexylthiophene): Synthesis, microphase separation, thin film transistors, and photovoltaic applications

Honeycomb-Structured Porous Films Controlled by the Temperature of Water Bath

Contact Info

Product

Resources

About