Consolidation experiments conducted on special prepregs made of constant viscosity oils and aligned graphite fibers are reported. Measurements the deformation behavior in "drained" state (oil impregnated, but zero pressure oil) reveal that, to a first approximation, fiber network can be modelled as nonlinear elastic network, model based bending beam is shown accurately fit data. Further more, finite load (> 3 psi) required compress volume fractions equal to, above range about 0.56 0.61....

ABSTRACT Solubility data for poly(3‐hexylthiophene) (P3HT) in 29 pure solvents are presented and discussed detail. Functional solubility parameter (FSP) convex (CSP) computations performed the CSP FSP results compared to previously reported Hansen parameters (HSPs) calculated using additive functional group contribution methods. The empirical reveals experimental with substantial polar ( δ P ) hydrogen‐bonding H components, which not intrinsic structure of P3HT polymer. Despite these...

The determination of solubility parameters for solutes represents a challenging mathematical problem locating the central tendency solvent affinity based on limited set data taken from experimental observations. At present, most commonly used methods computing solute require binary classification and employ spherical/ellipsoidal compatibility region in three-dimensional Hansen parameter space. Utilizing requires an arbitrary threshold, ellipsoidal fitting model imposes symmetry...

ABSTRACT The aggregation behavior of P3HT [ M n ≈ 28.2 kDa, regioregularity >96%, PDI 1.3] in 96 solvent mixtures is studied using UV–vis absorption spectroscopy. Hansen solubility parameters and Spano excitonic coupling analyses are used to identify correlations between the properties extent structural order aggregates. It clear that identity poor drive has a significant impact on and, hence, However, parameter theory does not account nor provide predictive for observed trends. Instead,...

ABSTRACT Intrinsic viscosity measurements were used in combination with the functional solubility parameter (FSP) and Hansen (HSP) fitting methods to determine parameters (SPs) of polycaprolactone (PCL). Despite using only eight solvents, a simple similarity criteria approach showed that HSPs FSPs good predictors relative solvent‐PCL affinity compared available literature SPs calculated additive group contribution methods. Three complementary computational methodologies—Conductor‐like...

Transitions of two different stereoisomers the He...ICl(X,v" = 0) weakly bound complex, one with a T-shaped orientation and another that is most likely linear, have been observed in laser-induced fluorescence experiments performed ICl B-X region. Here we present experimental theoretical results aimed at confirming previous assignments gaining additional insights into He+ICl interactions. High resolution action spectra were recorded same region to identify those features could be attributed...

Laser-induced fluorescence spectra of Br(2) entrained in a He supersonic expansion have been recorded the B-X, 8-0, 12-0, and 21-0 spectral regions at varying downstream distances, thus different temperature regimes. Features associated with transitions T-shaped linear He...Br(2)(X,nu(") = 0) complexes are identified. The changes relative intensities features cooling indicate that conformer is energetically more stable than conformer. A + Br(2)(X,nu(") ab initio potential-energy surface,...

Empirical data indicate that several good solvents for C60 and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) have substantial polar hydrogen-bonding components, which are not intrinsic to the structure of PCBM molecules themselves. Functional solubility parameter (FSP) convex (CSP) computations performed on using available in literature. The CSP FSP results compared previously reported Hansen parameters (HSPs) calculated additive functional group contribution methods. methods confirm...

The assembly of poly(3-hextylthiophene) (P3HT) in solvent mixtures is studied using solubility and solvatochromic parameters. Correlations between the excitonic coupling P3HT assemblies Kamlet–Taft (α, β, π*) scales reveal that lower values are observed binary characterized by low β (0 < ≤ 0.25) polarity (0.1 0.3). Hansen theory revisited evaluating directionality distance, Ra. Relationships Δδh Δδp vector components indicate (Δδp) specific solvent-solvent interactions reflected component...

A simple model based on the assumption of a thermodynamic equilibrium between populations T-shaped and linear He⋯I35Cl(X,v″ = 0) complexes stabilized in supersonic expansion is utilized to estimate relative binding energies ground state conformers. In this model, intensities laser-induced fluorescence features, attributed transitions each conformer, are used track changes along expansion. The features I35Cl(X,v″ rotational temperatures measured at distance fit ratios quantum mechanical...

Preparing electronically excited trans-stilbene molecules in deuterated chloroform using both one-photon excitation and through an intermediate vibrational state explores the influence of energy on excited-state isomerization solution. After infrared either two quanta C-H stretch vibration |2ν(CH)> at 5990 cm(-1) or stretch-bend combination |ν(CH) + ν(bend)> 4650 ground electronic state, ultraviolet photon intercepts vibrationally during course flow promotes them to state. The photons...

ABSTRACT Solubility parameters are certain measurable quantities that observed to influence the ability of a solvent fully dissolve polymer. Current theory partitions intermolecular forces between dispersion, polar, and hydrogen bonding interactions, thereby generating three‐dimensional solubility parameter space. The Hansen polymer taken be center sphere obtained from best fit coordinates good solvents in Investigations several polymers (lignin, polyethersulfone, bitumen) show convex hull...

The experimental results reported here demonstrate that weakly bound van der Waals complexes are not necessarily kinetically trapped in different isomeric forms a supersonic expansion. We have recorded the laser-induced fluorescence spectra of near T-shaped and linear He···ICl(X 1Σ+,v' ' = 0) ICl B−X, 3−0 spectral region at varying distances along expansion direction to monitor populations two isomers as local density, collision frequency, temperature change. ratio complex monotonically...

ABSTRACT Solubility parameter methods have also proven very useful in an array of theoretical and practical applications, particularly regarding the mutual solubility polymers organic semiconductors bulk‐heterojunction composites. The temperature dependence miscibility offers a promising route for directing organization materials composites toward optimal morphologies. Here, convex (CSP) approach is used to investigate three semiconductors: PCBM, P3HT, PCPDTBT. CSPs regions are computed at...

Rovibronic transitions of multiple conformers the He2···79Br2(X, v′′ = 0), He3···79Br2(X, He2···I35Cl(X, and He3···I35Cl(X, 0) complexes stabilized in a pulsed, supersonic expansion are observed action spectra recorded B−X region dihalogens. In addition to features associated with He2···79Br2 He2···I35Cl rare gas atoms localized toroidal potential well lying plane perpendicular dihalogen bond, those ground-state conformer that has one He atom other linear at end moiety also identified....

Poly(3-hexylthiophene)/graphene (P3HT/G) materials are synthesized using an in situ Grignard metathesis approach. The structural properties and spectroscopy of the studied NMR, FTIR, UV–vis absorption spectroscopies, wide-angle X-ray scattering, atomic force microscopy cyclic voltammetry. P3HT regioregularities ≥90% observed composites with approximate graphene compositions as high 20% by weight. 1H 13C NMR spectra liquid phase dispersions reveal signals that not pristine P3HT. intensity...

ABSTRACT Poly(3‐hexylthiophene)/single‐walled carbon nanotube (P3HT/SWNT) materials are synthesized using an in ‐ situ Grignard metathesis approach. The structural properties and photophysics of the studied a multitude techniques, including 1 H NMR, FTIR, UV–vis absorption, Raman, photoluminescence (PL), transient absorption spectroscopies. P3HT/SWNT composites with high P3HT regioregularity (rr &gt; 96%) observed. Raman spectroscopic data on solid samples reveals increase dispersion rate...

ABSTRACT Binary solvent mixtures were routinely used to induce the hierarchical assembly of poly(3‐hexylthiophene) (P3HT) in liquid phase. This technique has garnered a lot interest as route well‐organized films and composites, but, date, impact that attributes liquid‐phase aggregates have on organization only been partially scrutinized. The molecular weight concentration dependence P3HT three binary containing chloroform acetonitrile, n‐hexane, or dichloromethane studied using...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of [Pd2(.eta.5-C5Me5)2(.mu.-CO)2] and its reaction with acids. Structure [Pd3(.eta.5-C5Me5)3(.mu.3-CO)2]+[CF3SO3]-Neil M. Boag, David Boucher, Julian A. Davies, Robert W. Miller, Alan Pinkerton, Rashid SyedCite this: Organometallics 1988, 7, 3, 791–792Publication Date (Print):March 1, 1988Publication History Published online1 May 2002Published inissue 1 March...

Abstract The solubilities of three P3HT samples similar regioregularity ( rr ≈ 96%) but varying molecular weight M n = 14 kDa, 32 and 49 kDa) are measured in 23 organic solvents. solubility data is used to calculate the partial parameters δ D , P H ) using functional parameter (FSP) method. results reveal a monotonic decrease polar hydrogen‐bonding parameters, respectively, with increasing polymer. observed trends consistent recent experimental computational rationalized terms torsional...

Abstract The solubility and self‐assembly behavior of poly(3‐hexylthiophene) (P3HT) in solvent mixtures, the dominant intermolecular forces related to these attributes, have only been partially scrutinized. In this work, extent aggregation amorphous P3HT structural order aggregates ( M n ≈ 20 kDa 75 kDa) are investigated 54 mixtures chloroform with acetone, acetonitrile, dichloromethane, ethyl acetate, ethanol, ‐hexane. Correlations between molecular mass, aggregation, aggregates, nature...