Textures and defects of the hexagonal columnar phase of phthalocyaninato‐poly(siloxane) derivatives (PCPS)

Ries, Roland; Lieser, Günter; Schwiegk, S.; Wegner, Gerhard

doi:10.1002/actp.1997.010481203

Cited by 8 publications

(9 citation statements)

References 38 publications

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“…[16,[20][21][22][23] Soluble polymers equivalent to PcPS but containing germanium as the bridging unit instead of silicon have been synthesized by A. Ferencz. [23] The synthesis follows the principles developed for PcPS.…”

Section: Basic Concepts and Synthesismentioning

confidence: 99%

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Nanocomposites of Hairy‐Rod Macromolecules: Concepts, Constructs, and Materials

Wegner

2003

Macro Chemistry & Physics

101

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The rational construction of nanocomposites based on so‐called hairy‐rod macromolecules (HRM) is the objective of this review covering 15 years of extensive research at the Max Planck Institute for Polymer Research. HRM are described as shape‐persistent objects, which are processed into ultrathin films by the Langmuir–Blodgett protocol. Transfer of monolayers initially formed on the water surface to solid substrates is understood as a two‐dimensional analogue of an extrusion process giving rise to molecular orientation phenomena. The scope of HRM concerning chemical composition and molecular architecture is reviewed, and examples of how to obtain complex constructs having device functions are given. Recent work on hairy‐rod polyelectrolytes based on poly(p‐phenylene sulfonates)s is summarized as well, and their ability to form hierarchical superstructures in aqueous solution is presented.

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Section: Basic Concepts and Synthesismentioning

confidence: 99%

“…The packing of the Pc chromophores gives rise to very significant optical, electrochemical, and electrical properties, which have been the subject of attention as well 16,20–23. Soluble polymers equivalent to PcPS but containing germanium as the bridging unit instead of silicon have been synthesized by A. Ferencz 23.…”

Section: Basic Concepts and Synthesismentioning

confidence: 99%

Nanocomposites of Hairy‐Rod Macromolecules: Concepts, Constructs, and Materials

Wegner

2003

Macro Chemistry & Physics

101

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“…The direct imaging of individual, extended molecules of phthalocyaninato‐poly(siloxane) (PCPS) derivatives was demonstrated in a series of articles 68–70. The images showed the uniform diameter and electron density along the macromolecular backbone, and made it possible to discern the trajectory of the individual chains.…”

Section: Results From Other Laboratoriesmentioning

confidence: 99%

High resolution electron microscopy of ordered polymers and organic molecular crystals: Recent developments and future possibilities

Martin

Chen

Yang

et al. 2005

J Polym Sci B Polym Phys

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High Resolution Electron Microscopy (HREM) has made it possible to directly image the detailed organization of a variety of polymers and organic molecular crystals. For organic materials it is imperative to use low dose techniques that minimize the structural reorganizations that inevitably occur during electron beam irradiation. This article reviews recent developments in low dose HREM from our own laboratory and elsewhere. The developments in closely related microstructural characterization techniques are also reviewed. In the future, the ability to correct the spherical aberration of the objective lens, the use of low voltages to increase contrast, and the use of time resolved techniques are expected to open new avenues for the ultrastructural investigations of organic materials. New sample preparation techniques, such as the ability to make thin samples by focused ion beam (FIBs), to cut samples with an oscillating diamond knife, and to more conveniently prepare cryogenically solidified specimens,are also expected to be of increasing importance

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“…[23] This transient phenomenon is related to space filling problems in areas of pronounced bend of the columnar director. [24] For comparison, a drop-cast film of HBC-PhC12, which was prepared in the absence of an electric field, was studied by polarizing microscopy.…”

Section: Polarized Optical Microscopy (Pom)mentioning

confidence: 99%

Field‐Force Alignment of Disc‐Type π Systems

et al. 2007

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The ability of electric fields to align nonpolar semiconducting molecules was demonstrated using hexa(para-n-dodecylphenyl)hexabenzocoronene (HBC-PhC12) as a model compound. A solution of HBC-PhC12 was applied to a glass surface by drop-casting and the molecules were oriented into highly ordered structures by an electric field during solvent evaporation. Atomic force microscopy (AFM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) showed a long-range alignment where the disclike molecules were organized in columns perpendicular to the direction of the imposed electric field. The high anisotropy of the uniaxially aligned films was characterized by cross-polarized light microscopy. The birefringence of the HBC-PhC12 films was related to the presence of extended domains of unidirectionally aligned columns in which the aromatic cores of the HBC-PhC12 molecules were perpendicular to the columnar axis. The packing and the arrangement of the molecules in the field-force ordered films were proven by electron diffraction and X-ray analyses.

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Textures and defects of the hexagonal columnar phase of phthalocyaninato‐poly(siloxane) derivatives (PCPS)

Cited by 8 publications

References 38 publications

Nanocomposites of Hairy‐Rod Macromolecules: Concepts, Constructs, and Materials

Nanocomposites of Hairy‐Rod Macromolecules: Concepts, Constructs, and Materials

High resolution electron microscopy of ordered polymers and organic molecular crystals: Recent developments and future possibilities

Field‐Force Alignment of Disc‐Type π Systems

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