It was demonstrated that polymeric supramolecular nanostructures with several length scales allow straightforward tailoring of hierarchical order-disorder and order-order transitions the concurrent switching functional properties. Poly(4-vinyl pyridine) (P4VP) stoichiometrically protonated methane sulfonic acid (MSA) to form P4VP(MSA)1.0, which then hydrogen-bonded pentadecylphenol. Microphase separation, re-entrant closed-loop macrophase high-temperature separation were observed. When MSA...

We show that polymeric materials characterized by two length scales are obtained if diblock copolymers mixed with amphiphilic selective solvents, leading to self-organization which combines the "block copolymer scale" a much shorter "nanoscale". In this work, compound is 3-n-pentadecylphenol (PDP) hydrogen-bonded pyridine group of polystyrene-block-poly(4-vinylpyridine), i.e., PS-b-P4VP. The molecular architecture resembles comb-coil A-block-(B-graft-C) but using supramolecular assembly...

Properly selected hydrogen bonding suffices to induce mesomorphic structures in mixtures of flexible polymers and nonmesogenic surfactants. For poly(4-vinylpyridine)−3-pentadecylphenol (P4VP(PDP)x) complexes, the long period lamellar structure decreases as x-1 (x is number PDP molecules per P4VP repeat unit) complete contrast similar polyelectrolyte systems. Upon cooling from 80 °C room temperature, gradually increases levels off at around 30 a value which approximately 4 Å above starting...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMesomorphic State of Poly(vinylpyridine)-Dodecylbenzenesulfonic Acid Complexes in Bulk and Xylene SolutionOlli Ikkala, Janne Ruokolainen, Gerrit ten Brinke, Mika Torkkeli, Ritva SerimaaCite this: Macromolecules 1995, 28, 21, 7088–7094Publication Date (Print):October 1, 1995Publication History Published online1 May 2002Published inissue 1 October 1995https://pubs.acs.org/doi/10.1021/ma00125a009https://doi.org/10.1021/ma00125a009research-articleACS...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(4-vinyl pyridine)/Zinc Dodecyl Benzene Sulfonate Mesomorphic State Due to Coordination ComplexationJanne Ruokolainen, Juha Tanner, Gerrit ten Brinke, Olli Ikkala, Mika Torkkeli, and Ritva SerimaaCite this: Macromolecules 1995, 28, 23, 7779–7784Publication Date (Print):November 1, 1995Publication History Published online1 May 2002Published inissue 1 November...

This account highlights recent progress towards understanding the complex hierarchical levels of solid-state structure in a prototypical helical hairy-rod polyfluorene, poly[9,9-bis(2-ethylhexyl)fluorene-2,7-diyl] (or PF2/6). branched-side-chain containing polyfluorene undergoes systematic intermolecular self-assembly and liquid-crystalline phase behavior combination with uniaxial biaxial alignment. The latter processes yield full three-dimensional orientation crystallites polymer chains....

Swelling behavior and rearrangements of an amorphous ultrathin cellulose film (20 nm thickness) exposed to water subsequently dried were investigated with grazing incidence X-ray diffraction, neutron reflectivity, atomic force microscopy, surface energy calculations obtained from contact angle measurements. The swelled excessively in water, doubling its thickness, but shrunk back the original thickness upon removal. Crystallinity (or amorphousness) morphology remained relatively unchanged...

Hydrophobins represent an important group of proteins from both a biological and nanotechnological standpoint. They are the means through which filamentous fungi affect their environment to promote growth, properties at interfaces have resulted in numerous applications. In our study we combined protein docking, molecular dynamics simulation, electron cryo-microscopy gain atomistic level insight into surface structure films composed two class II hydrophobins: HFBI HFBII produced by...

Hydrophobins are highly surface-active proteins that specific to filamentous fungi. They function as coatings on various fungal structures, enable aerial growth of hyphae, and facilitate attachment surfaces. Little is known about their structures structure-function relationships. In this work we show organized surface layers hydrophobins, representing the most detailed structural study hydrophobin films so far. Langmuir-Blodgett class II hydrophobins HFBI HFBII from Trichoderma reesei were...

Small-angle x-ray scattering (SAXS) patterns are recorded from thin breast tissue samples containing healthy and cancerous regions. The SAXS compared with histo-pathological observations. information available is reviewed, a model for collagen presented. Scattering of at regions far the tumours essentially different those tumours. axial period fibrils 65.0 +/- 0.1 nm in regions, 0.3 larger cancer-invaded average intensity an order magnitude higher than This interpreted to arise increase...

Four first primary alcohols and 1-octanol were studied with the wide-angle X-ray scattering method using both transmission reflection techniques at room temperature (293 K). The subsequent radial distribution analysis gives C–O C–C distances that are in good agreement known bond lengths of single alcohol molecules. shortest averaged C–H O–H much smaller than those from gas-phase data. It is deduced shortened distance caused by deformed electron between H C atoms. intermolecular hydrogen...

Dynamic mechanical spectroscopy (DMS) is used to further investigate the recently observed order−disorder transition (ODT) in comblike block copolymers obtained by hydrogen bonding between poly(4-vinylpyridine) and pentadecylphenol (P4VP−PDPx). For stoichiometric amounts of pyridine phenol, i.e., x = 1.0, ODT a lamellar structure occurs at T ≃ 65 °C. The dynamic moduli G' G'' simultaneously show crossover from liquidlike behavior (G' ∼ ω1.5 ω) response intermediate Newtonian fluid solid ≈...

We report on the phase behavior of poly(9,9-dihexylfluorene) (PF6), poly(9,9-diheptylfluorene) (PF7), poly(9,9-dioctylfluorene) (PF8), poly(9,9-dinonylfluorene) (PF9), and poly(9,9-didecylfluorene) (PF10) in methylcyclohexane (MCH). After a heating−cooling cycle, 10−50 mg/mL concentration range, PF6/MCH, PF7/MCH, PF8/MCH, PF9/MCH systems were found to be gel-like, while PF10/MCH appears less viscous. form large (10−100 nm) sheetlike assemblies (thickness 2−3 nm). The larger length scale...

Hydrophobins are a group of surface-active fungal proteins known to adsorb the air/water interface and self-assemble into highly crystalline films. We characterized self-assembled protein films two hydrophobins, HFBI HFBII from Trichoderma reesei, directly at using Brewster angle microscopy, grazing-incidence X-ray diffraction, reflectivity. Already in zero surface pressure, micrometer-sized rafts containing hexagonally ordered two-dimensional crystallites with lattice constants 55 Å 56 Å,...

Comb-shaped or hairy rodlike supramolecules can be obtained by hydrogen bonding rigid rod polymers and amphiphilic oligomers. Here we introduce a concept to achieve electrically conducting acid doped PANI allow cylindrical self-organization. is with camphorsulfonic (CSA) where 4-hexylresorcinol (Hres) bonded form supramolecules, which further undergo The structure formation of PANI(CSA)0.5(Hres)y complexes discussed on the basis small- wide-angle X-ray scattering electrical conductivity....

The critical interaction strength to induce mesomorphic structures in flexible polymers by complexing with surfactants is determined using different hydrogen-bonding strengths. Two essential requirements have be satisfied: (i) the association has strong enough, otherwise structure dissociates. (ii) polar−nonpolar repulsion sufficiently microphase separation. If latter requirement not satisfied, but strong, a characteristic comb polymer-like SAXS peak will still present homogeneous melt...

The possibility of developing polyfvinylidene fluoride (PVDF)-based membranes as proton conductors has been investigated. Using electron beam radiation grafting and functionalisation, the composition can be controlled. Membranes have prepared from porous films PVDF, their structure properties studied with Raman spectroscopy, wide angle X-ray scattering (WAXS), small (SAXS), swelling tests, by impedance spectroscopy. reaction styrene, initiated in amorphous regions at surfaces crystallites...

We report on time resolved combined differential scanning calorimetry, small-angle and wide-angle x-ray scattering of hydrogen bonded flexible polymer-surfactant systems. The results show the presence an order-disorder transition from a homogeneous to lamellar structure due dynamic coupling between surfactant polymer. state exhibits distinct peak characteristic comb copolymerlike fluctuations. position is strongly dependent temperature amount material.

Polystyrene-block-poly(4-vinylpyridine) with nominally one pentadecylphenol molecule hydrogen-bonded to each pyridine group has been electrospun, leading fibers a hierarchical, structure-within-structure morphology (see Figure). An internal structure on the nanometer length scale exists within tens-of-nanometers scale. Internal porosity can be obtained by selective removal of amphiphile.

The green filamentous bacterium Chloroflexus aurantiacus employs chlorosomes as photosynthetic antennae. Chlorosomes contain bacteriochlorophyll aggregates and are attached to the inner side of a plasma membrane via protein baseplate. structure from C. was investigated by using combination cryo-electron microscopy X-ray diffraction compared with that Chlorobi species. Cryo-electron tomography revealed thin for which distinct crystalline baseplate lattice visualized in high-resolution...