Fluorescent bilayer film, consisting of an active layer a microporous conjugated polymer with intramolecular stack structure, is successfully fabricated. This film shows the simultaneous occurrence in actuation and fluorescence change response to external chemical stimuli. Highly reversible uncurling-curling movement, accompanied changes color intensity, achieved upon sequential exposure alcohol water.

Solvent-to-polymer chirality transfer was examined using conjugated polymer with intramolecular stack structure (IaSS). When achiral poly(diphenylacetylene)s (PDPAs) dissolved in limonene, the solvent successfully transferred to side phenyl structure, leading axial chirality. The phenyl–phenyl IaSS under thermodynamic control readily undergo asymmetric changes chiral optical activity isotropic between main chain and resonant rings. significantly affected by length substitution position of...

Swollen up: Poly(diphenylacetylene) derivatives with different alkyl groups show intramolecular excimer emission that arises from the phenyl–phenyl stack structure in side chains. The is intrinsically correlated lamellar layer distance. Film-swelling experiments verify can be modulated by changing lamella distance (see picture).

The design and preparation of hollow nonspherical microparticles are great significance for their potential applications, but the development a facile synthetic method using only one production step remains challenge. In current work, new template-free based on dispersion polymerization was successfully developed to produce anisotropic polystyrene (PS) in single step. synthesis, ammonium persulfate (APS) played critical role formation growth highly uniform stable PS microparticles. By...

ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication the EditorNEXTSwelling-Induced Emission Enhancement in Substituted Acetylene Polymer Film with Large Fractional Free Volume: Fluorescence Response Organic Solvent StimuliGiseop Kwak*†, Wang-Eun Lee†, Heejun Jeong†, Toshikazu Sakaguchi‡, and Michiya Fujiki§View Author Information Department of Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 702-701, Korea; Materials Science Engineering, Graduate...

When a fluorescent conjugated polymer film of PTMSDPA with an extremely large fractional free volume was directly or indirectly contacted to latent fingerprints, high resolution fluorescence images were obtained.

High molecular weight poly(diphenylacetylene) [PDPA] derivatives are introduced as fluorescent, soft conjugated polymers that exist in the gum state at room temperature. The gum‐like behavior of is easily modified according to side alkyl chain length and substitution position. Long chain‐coupled PDPA provide sticky gums Manual kneading produce films with very smooth surfaces. show an endothermic transition due melting long chains. X‐ray diffraction reveals a new signal molten aliphatic...

Highly advanced phase-change hybrids (PCHs), which consist of a material and conjugated polymer, were developed for new sensor actuator applications. PCH films with excellent characteristics obtained simply by depositing various molten paraffin waxes (PWs) in situ onto poly(diphenylacetylene) (PDPA) extremely large fractional free volumes. The enthalpy the PWs hybrid was quite high remained constant over prolonged use. underwent critical changes both fluorescence (FL) intensity color during...

ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication the EditorNEXTFluorescent Viscosity Sensor Film of Molecular-Scale Porous Polymer with Intramolecular π-Stack StructureWang-Eun Lee†, Chang-Lyoul Lee‡, Toshikazu Sakaguchi§, Michiya Fujiki⊥, and Giseop Kwak*†View Author Information† Department Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 702-701, Korea‡ Advanced Photonics Research Institute, Gwangju Institute Science Technology, 1 Oryong-dong,...

Liquid crystalline diphenylacetylene polymer derivatives showed piezochromic fluorescence via order-to-disorder phase transition.

Conjugated polyelectrolytes (CPEs) are emerging as promising materials in the sensor field because they enable high-sensitivity detection of various substances aqueous media. However, most CPE-based sensors have serious problems real-world application system is operated only when CPE dissolved Here, fabrication and performance a water-swellable (WS) driven solid state demonstrated. The WS films prepared by immersing water-soluble film cationic surfactants different alkyl chain lengths...

In this paper, specific molecular design rules are proposed for highly fluorescent, photostable, conjugated polymer dots (CPDs) applicable the bioimaging of live cells. CPDs prepared by nanoprecipitation in water using polydiphenylacetylene (PDPA) derivatives and commercial polymers. Among these, an amorphous, glassy‐state PDPA derivative provides porous, coarsened nanoparticles. The nanoparticles dispersed very well water, chains either hydrodynamically or thermodynamically stable, with a...

The significant variation in photoluminescence emission of poly(diphenylacetylene) derivatives according to the substitution position is due differences intramolecular π-stack structure and chain conformation.

Abstract Finely structured diphenylacetylene polymer nanofibers were successfully prepared by a freeze drying method. SEM revealed that the morphology and structure of fibers significantly dependent on concentration solution, ‘frozen in’ quenching temperature chemical derivatives. Polarized fluorescence spectroscopy chains within nanofiber uniaxially oriented highly elongated. The was remarkably sensitive to explosive nitroaromatic compounds when compared corresponding thin films. obtained...

The side chain chirality of a poly(diphenylacetylene) derivative was transferred and amplified spontaneously from solution to bulk film due lyotropic liquid crystallinity.

Highly efficient and stable BDT2TR:PNDI-2T organic solar cells are investigated. Although this system shows a PCE of 4.43%, significant enhancements observed in the thermal stability, high thickness tolerance, flexibility as compared with PC₇₁BM-based cells.

Fluorescence (FL) emission properties, microporous structures, energy-minimized chain conformations, and lamellar layer structures of the silicon-containing poly(diphenylacetylene) derivative p-PTMSDPA before after desilylation were investigated. The nitrogen-adsorption isotherms film typical type I, indicating structures. BET surface area pore volume significantly reduced reaction, simultaneously, its FL intensity remarkably decreased. theoretical calculation on both model compounds...

A microporous, conjugated polymer with a conformation-variable stack structure is highly responsive to change in the surface tension of water, either physicochemically or electronically. The film and powder become readily wet water by addition (bio)surfactants reveal emission-enhanced fluorescence, which are applied saponin detection, image patterning ink-jet printing. As service our authors readers, this journal provides supporting information supplied authors. Such materials peer reviewed...

An anionic conjugated polyelectrolyte based on polydiphenylacetylene showed a significant fluorescence turn-on response to positively-charged proteins through conformational relaxation of its intramolecular stack structure.

ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTEnhancements in Emission and Chemical Resistance of Substituted Acetylene Polymer via Situ Sol−Gel Reaction FilmHeejun Jeong, Wang-Eun Lee, Giseop Kwak*View Author Information Department Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 702-701, Korea*To whom correspondence should be addressed: Tel +82-53-950-7558; fax +82-53-950-6623; e-mail [email protected]Cite this: Macromolecules 2010, 43, 2, 1152–1155Publication Date...

An acetylene–acrylate polymer hybrid film with enhanced emission, chemical resistance, and photooxidative stability was successfully prepared by the photopolymerization of acrylates in situ poly[1-phenyl-2-(p-trimethylsilyl)phenylacetylene] (PTMSDPA) film. acrylate mixture methyl (MA) trimethylol propanetriacrylate (TMPTA) easily diffused into PTMSDPA film, simultaneously, emission significantly increased. Subsequently, when acrylate-deposited irradiated UV light at appropriate irradiation...

This paper reports a unique fluorescence (FL) response and diverse applications of conjugated polyelectrolyte (CPE) through nonelectrostatic interaction with appropriate (bio)surfactants in an immiscible two-phase system. A sulfonated microporous polymer (SMCP) conformation-variable intramolecular stacked structure was used as the CPE film. Despite extremely high hydrophilicity, SMCP film responded significantly to hydrophobic circumstances, either physicochemically or electronically,...