The relationship between glass transition (Tg) and ionic conductivity (σ) of an amorphous crosslinked polymer electrolyte membrane (PEM) was examined based on ion–dipole complexation dissociated lithium cations ether oxygen poly(ethylene glycol diacrylate) plasticization by succinonitrile (SCN). In a binary PEM consisting salt/polymer network, Tg increased due to strong interaction, whereas σ declined lower ion mobility coupled reduced chain mobility. Above the threshold salt concentration 7...

The development of internal microstructure in electrospun fibers has been investigated both experimentally and theoretically. Various morphologies such as tubes, beads, porous structures have observed during electrospinning from amorphous polymer solutions poly(methyl methacrylate)/methylene chloride poly(styrene)/tetrahydrofuran. dynamics is modeled based on multiple virtual strands beads connected by Maxwell's elements a cylindrical coordinate system. Concurrently, spatiotemporal growth...

In an effort to develop free-standing lithium battery membrane, binary and ternary phase diagrams of poly(ethylene oxide) (PEO), bis(trifluoromethane)sulfonimide (LiTFSI), succinonitrile (SCN) (i.e., solid plasticizer) mixtures have been established by means differential scanning calorimetry polarized optical microscopy. The occurrence hydrogen bonds and/or coordination in each pair (PEO/SCN, SCN/LiTFSI, PEO/LiTFSI) was examined using Fourier transform infrared spectroscopy. PEO/LiTFSI...

Abstract A blend system of linear low‐density polyethylene (LLDPE) (ethylene butene‐1 copolymer) with high‐density (linear) (HDPE) is investigated by differential scanning calorimetry (DSC), wide‐angle x‐ray diffraction (WAXD), small‐angle scattering (SAXS), Raman longitudinal‐acoustic‐mode spectroscopy (LAM), and light (LS). For slowly cooled or quenched samples, one single endotherm evident in the DSC curve which depends on composition. No separate peaks are observed WAXD, SAXS, Raman‐LAM,...

Temporal evolution of the fiber morphology during dry spinning has been investigated in framework Cahn-Hilliard equation [J. Chem. Phys. 28, 258 (1958)] pertaining to concentration order parameter or volume fraction given by Flory-Huggins free energy mixing [P. J. Flory, Principles Polymer Chemistry (Cornell University Press, Ithaca, NY, 1953), p. 672] conjunction with solvent evaporation rate. To guide induced phase separation, equilibrium diagram starting polymer solution was established...

Abstract The present article describes preparation, characterization, and physical properties of nanoparticles‐filled composites consisting multiwall carbon nanotubes (MWCNT) styrene‐butadiene rubber nitrile‐ butadiene rubber. reinforcing MWCNT fillers were synthesized by chemical vapor deposition on iron cobalt catalysts supported calcium carbonate substrates. These further treated with nitric acid to produce hydroxyl carbonyl functional groups the (CNT) surfaces. Of particular importance...

This paper describes the preparation, physical properties, and electric bending actuation of a new class active materials-ionic liquid crystal elastomers (iLCEs). It is demonstrated that iLCEs can be actuated by low-frequency AC or DC voltages less than 1 V. The strains unoptimized first are already comparable to well-developed ionic electroactive polymers. Additionally, exhibit several novel superior features, such as alignment increases performance actuation, possibility preprogrammed...

Numerical calculations reveal that the target and spiral growth patterns in spherulites can be generated from time-dependent Ginzburg-Landau equations (model $C$) by coupling a conserved compositional order parameter nonconserved crystal ordering parameter. Of particular interest is periodic concentric rings (target) or spirals at spherulitic core remain stationary both (orientational) field concentration field. Another intriguing observation of occurs stepwise fashion synchronism with...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase separation by spinodal decomposition in polycarbonate/poly(methyl methacrylate) blendsThein Kyu and Jeanne M. SaldanhaCite this: Macromolecules 1988, 21, 4, 1021–1026Publication Date (Print):April 1, 1988Publication History Published online1 May 2002Published inissue 1 April 1988https://pubs.acs.org/doi/10.1021/ma00182a030https://doi.org/10.1021/ma00182a030research-articleACS PublicationsRequest reuse permissionsArticle...

A phenomenological model for predicting phase diagrams of a binary nematic mixture containing side chain liquid crystalline polymers and/or low molar mass crystals has been proposed by combining Flory–Huggins free energy isotropic mixing and Maier–Saupe ordering the nematogens. Two orientational order parameters, s1 s2, two components in mixtures having different clearing temperatures are taken into consideration calculation. The interaction parameter, χ, parameter theory, ν11 ν22, assumed...

Spatio-temporal growth of isotactic polystyrene single crystals during isothermal crystallization has been investigated theoretically based on the phase field model by solving temporal evolution a nonconserved order parameter coupled with heat conduction equation. In description total free energy, an asymmetric double-well local energy density adopted to represent metastable melt and stable solid crystal. Unlike small molecule systems, polymer rarely reaches thermodynamic equilibrium; most...

Dynamics of phase separation in a polymerizing system, consisting carboxyl terminated polybutadiene acrylonitrile/epoxy/methylene dianiline, was investigated by means time-resolved light scattering. The initial length scale found to decrease for some early periods the reaction which has been explained context nucleation initiated spinodal decomposition. We have combined Cahn-Hilliard kinetic equation and polymerization kinetics, predicted reduction triggered nucleation.

Abstract Summary: To mimic the emergence of gradient morphology in polymer nanofibers, a new theoretical approach has been developed context Cahn‐Hilliard time evolution equation, alternatively known as time‐dependent Ginzburg‐Landau equation (Model B) involving concentration order parameter. The effects solvent evaporation on nanofibers have demonstrated. numerical simulation showed that formation skin layers is governed by competition between rate and mutual diffusion rate. That to say are...

Abstract Small‐angle light‐scattering (SALS) patterns were obtained during melting and crystallization of blends linear low‐density polyethylene (LLDPE) with conventional (LDPE). Quantitative measurements these SALS using a two‐dimensional optical multichannel analyzer apparatus (OMA2) indicate that the LLDPE which is miscible LDPE component in molten state crystallizes first, forming volume‐filling spherulites. The then within preformed These findings are supported by microscopy studies...

The dynamic mechanical properties of Nafion precursor were determined as a function the degree conversion to sodium ionomer, and those acid cesium salt. A run was also made on barium neutralized material, well remolded sample partly converted precursor. shows four dispersions which (in order decreasing temperature) are identified with glass transition, motions ether side chains, CF 2 groups in backbone, pendant SO F groups. Four relaxation regions seen transition ionic matrix, chains...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of solvent casting on evolution phase morphology PC/PMMA blendsJeanne M. Saldanha and Thein KyuCite this: Macromolecules 1987, 20, 11, 2840–2847Publication Date (Print):November 1, 1987Publication History Published online1 May 2002Published inissue 1 November 1987https://pubs.acs.org/doi/10.1021/ma00177a033https://doi.org/10.1021/ma00177a033research-articleACS PublicationsRequest reuse permissionsArticle Views835Altmetric-Citations66LEARN...

Low current drain driven by the low ionic conductivity of a solid polymer electrolyte is one major obstacles solid-state battery. In an effort to improve membrane (PEM), polyethylene glycol diacrylate (PEGDA) and monofunctional methyl ether acrylate (PEGMEA) were copolymerized via photopolymerization afford PEGDA network with dangling PEGMEA side chains. By attaching branches backbone, glass transition temperature (Tg) was found decrease, which may be controlled relative amounts PEGDA....

Solvent-cast films of polycarbonate (PC)/polymethyl methacrylate (PMMA) mixtures exhibit a single-phase structure with outstanding optical clarity. Differential scanning calorimetry (DSC) studies show single glass transition in the intermediate blends. However, blends undergo phase separation upon heating above 240°C. The diagram has been established subsequently by means cloud point method and is reminiscent lower critical solution temperature (LCST) character.

The present article entails the generation of flexoelectricity during cantilever bending a solid polymer electrolyte membrane (PEM), composed poly(ethylene glycol) diacrylate (PEGDA) precursor and ionic liquid (hexylmethylimidazolium hexafluorophosphate). effects thiosiloxane modification PEGDA on glass transition, conductivity, flexoelectric performance have been explored as function PEM composition. transition temperature (Tg) declines with increasing amount in co-network, while...

A thermodynamically self-consistent theory has been developed to establish binary phase diagrams for two-crystalline polymer blends by taking into consideration all interactions including amorphous−amorphous, crystal−amorphous, amorphous−crystal, and crystal−crystal interactions. The present basically involves combination of the Flory−Huggins free energy amorphous−amorphous isotropic mixing Landau solidification (e.g., crystallization) crystalline constituents. solution via minimization...

A self-consistent theory has been developed for determination of phase diagrams a crystalline polymer solution. Although the original Flory diluent captures liquidus line, is incapable accounting solidus line due to inherent assumption complete immiscibility solvent in solid crystal. The present considers all possible interactions involving amorphous−amorphous and crystal−amorphous interactions. solutions predict various liquid−liquid, pure solid, liquid−solid coexistence regions bound by...

The present article describes an equilibrium theory for determining binary phase diagrams of various crystalline-amorphous polymer blends by taking into account the contributions from both liquid-liquid separation between constituents and solid-liquid transition crystalline component. An analytical expression a crystal-amorphous interaction parameter is deduced based on transition, involving solidus liquidus lines in conjunction with coexistence curve upper critical solution temperature...