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Computer simulations are an important implementation to experimental methods working on polymer nanocomposites (PNCs), which have advanced properties because of their unique hierarchy microstructures. In this paper, different computer simulation methods applied to investigate the structures and properties of PNCs and the simulation predicted physical properties of PNCs are reviewed. The fundamentals...
Halogen-based fire retardants are often used to reduce flammability and improve the fire resistance properties of polymers and fiber-reinforced polymer composites (FRPs). Brominated vinyl ester resins (Br-VERs) are a class of halogenated polymer matrices that are economically viable, high performance materials that are widely utilized in composites for specialty applications, such as the fabrication...
Aiming to reveal the effects of mechanical energy and thermal effect on micropore nucleation and growth in oriented high density polyethylene (HDPE) film, stress relaxation after cold stretching was imposed at low and elevated temperature with strain holding constant, respectively, and corresponding structure evolution was tracked by in situ and ex situ small angle X-ray scattering (SAXS). It was...
A novel heterocyclic and plank-shape diamine monomer, 2,6-(4,4′-diaminodiphenyl) benzo[1,2-d:5,4-d'] bisoxazole (PBOA), was successfully synthesized from readily available compounds of 4,6-diaminoresorcinol dihydrochloride (DAR) and p-aminobenzoic acid (PABA). A series of poly(benzobisoxazole-co-imide) (PBOI) fibers based on 3,3′,4,4′-biphenyltetracarboxylic anhydride (BPDA), 4,4′-diaminodiphenyl...
Three acrylpimaric acid polyglycol esters (APAPG) with different molecular weight were successfully prepared. The surface properties of three esters were investigated by surface tension and fluorescence techniques. The critical micelle concentrations (CMC) were detected. Reorientation theory was proposed to describe the adsorption behavior and the conformational changes of these surfactant molecules...
A classical side-chain liquid crystalline polymer (SCLCP) named poly [ω-(4′-n-octadecyloxybiphenyl-4-oxy) hexyl methacrylate (PM6BiC18) have been synthesized. The polymer and its monomer (M6BiC18) organogels were prepared by introducing PM6BiC18 or M6BiC18 into common organic solvents. The minimum gelation concentration (MGC) and gel-to-sol transition temperature (TGS) were tested by the “tube-testing...
Herein, we demonstrate an effective fine-tuning of carrier transport properties in polymer semiconductors by loading fluorine atoms on polymeric π-systems. To a thienoisoindigo-based conjugated backbones, we introduced dithiophenethene, difluorodithiophenethene, difluorodiphenylethene, and tetrafluorodiphenylethene units affording D−A copolymers, PTIDTE, PTIFDTE, PTIDFPE, and PTITFPE, respectively...
By employing molecular dynamics simulations, we explored different size-dependent dynamics of NPs in semiflexible linear and ring polymer nanocomposites. Large NPs diffuse faster slightly in flexible ring polymer nanocomposites than in flexible linear polymer ones. However, the motions of large NPs in semiflexible ring polymer nanocomposites with large bending energies are very slow and NPs exhibit...
Defect-free mixed-matrix membranes (MMMs) based on triptycene-containing polyimide and zeolite imidazole framework (ZIF-90) were prepared in systematically varied compositions using priming and solution-casting method for gas separation. Microstructure analyses confirm that hierarchical triptycene units effectively assist in the nanoparticle dispersion and prevent aggregation, which, in conjunction...
Novel one-handed helical copoly(phenylacetylene)s bearing a small amount of 3-(triethoxysilyl)propyl residues (CPAs 1–4) were synthesized, and efficiently chemically immobilized onto silica gel by the intermolecular polycondensation of the triethoxysilyl groups. Their chiral recognition abilities were evaluated as immobilized-type chiral stationary phases (CSPs) for high performance liquid chromatography...
As a promising structural material, various tough hydrogels have been developed in recent years by incorporating different kinds of noncovalent bonds as the energy-dissipating segments. Among these systems, it is challenging to use hydrogen bonds due to their instability in aqueous environment. Here we report a tough hydrogel of poly(1-vinylimidazole-co-acrylic acid) (P(VI-co-AAc)) reinforced by the...
In this paper, we used electrospinning to fabricate electret polyvinylidene fluoride (PVDF) membranes that show tremendous potential for its use as a high-performance air filter medium. A novel charge storage enhancer by means of nanoscale graphite platelets (NGP) dispersed within the fibrous matrix and the filtration performance were investigated. The surface potential of as-spun membrane was characterized...
A series of poly(arylene ether ketone)s (PAEKs) with dense sulfonic-acid-functionalized pendants were successfully synthesized by the Ullmann C–N coupling of a polymer precursor containing pendant iodobenzene rings and 3,6-ditrityl-9H-carbazole, followed by sulfonation using chlorosulfonic acid. A tough transparent membrane, which exhibited suitable dimensional stability and high proton conductivity,...
We present here the application of in situ cascade polycondensation-coupling ring-opening polymerization (PROP) method for the facile synthesis of a series of three-component poly(butylene terephthalate)-block-poly(ethylene oxide)-block-poly(propylene oxide)-block-poly(ethylene oxide) multiblock terpolymers (PBT-b-PEO-b-PPO-b-PEO-b-PBT)n, using cyclic oligo(butylene terephthalate)s (COBTs) as monomers...
A novel polytriphenylamine derivative, poly(4-carbamoyl-N,N-diphenylaniline-2,2,5,5-tetramethyl-pyrrolin-1-oxyl) (PTPA-PO) has been synthesized and utilized for the fabrication of the cathode material for organic rechargeable batteries for the first time. The molecular structure, morphology, and electrochemical performance of the obtained polymers were characterized by Fourier transform infrared spectroscopy...
We study the molecular origins of anisotropy in a semicrystalline polymer nanocomposite that is caused by aligned, elongated filler nanoparticles. Our study is based on spatially resolved 2D WAXS/SAXS data that indicates the arrangement of molecules, lamellae, and filler particles in the composite. Isotactic polypropylene (IPP) samples filled with anisotropic TiO2 nanoparticles were prepared by injection...
Two four-component chiral polymers with two Förster resonance energy transfer (FRET) pairs incorporating chiral 1,1′-binaphthyl, 4,7- di(thiophen-2-yl)-2,1,3-benzothiadiazole (DTBT), tetraphenylethene (TPE) and fluorene moieties were designed and synthesized via one-pot two-step of Pd-catalyzed Sonogashira reaction and Suzuki reaction by changing different ratios of DTBT chromophore and AIE-active...
The work aims to interpret the phase behavior of multi-polymers in super critical CO2 via a spatially dependent structural parameter, the monomer sequence distribution, rather than traditional statistical factors. Well-defined statistical copolymers based on three CO2-philic monomers, vinyl acetate, vinyl butyrate and vinyl butyl ether, were synthesized with reversible addition-fragmentation chain...
The influence of oleic acid modified Fe3O4 (OA-Fe3O4) nanoparticles on the morphology and foaming behavior of cocontinuous linear low density polyethylene/polystyrene (LLDPE/PS) immiscible blends (60/40 by weight) was studied. The morphology observation showed that the addition of nanofillers resulted in the increased dispersion degree of both LLDPE and PS components and even the transformation of...
Spherical poly(acrylic acid)-block-polystyrene (PAA-b-PS) nano-objects were prepared via polymerization induced self-assembly (PISA) and used as templates for the synthesis of silver nanoparticles (Ag NPs). The PAA shells on the spheres acted as templates for the formation of immobilized Ag NPs by loading Ag + ions followed by reduction. The templates covered with discrete Ag NPs showed surface-enhanced...
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