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The nanowire of conjugated polymer with higher density is desirable for its improved charge transport. However, at a higher solution concentration, the conjugated polymer chain entanglement is severe and not beneficial for the nucleation to grow nanowires. In this paper, we control the equilibrium of entanglement ↔ disentanglement ↔ nucleation and growth by tuning the radius of interaction (Ra) between...
Localized shear flow was imposed by pulling glass fiber in polyethylene (PE) melt below and above its equilibrium melting point (141.6 °C). Immediately after the cessation of shear, the structure around the fiber was investigated with in-situ synchrotron radiation scanning X-ray microdiffraction (SR-μSXRD), which had spot area of 4.2 × 4.5 μm2 and step size of 6 μm. Results indicate that crystalline...
The mechanical response of fluoroelastomer F2314 under uniaxial extension and its relation with strain-induced structural change are investigated by mechanical analysis, in-situ small angle X-ray scattering (SAXS) and wide angle X-ray scattering (WAXS). Yielding of samples followed by strain hardening is found without necking. Meanwhile, the strain range of strain softening is short, which is 0.77 at...
The preparation of diketopyrrolopyrrole-based polymer nanowires seems very difficult, probably due to the fact that the nanowires length direction is along the main chain not the π-π direction. For the nanowires whose length direction is along the main chain, the probability of the short nanowires to meet the ends of other molecules to grow longer is very small. Herein, we prepared long 3,6-bis-(thiophen-2-yl)-N,N’-bis(2-octyl-1-dodecyl)-1,4-dioxo-pyrrolo...
Crystallinity distribution of natural rubber around filled micrometer-size glass beads under different strains are studied with in-situ micro-focused scanning X-ray diffraction (μ-SXRD), where the glass beads are taken to serve as a model of filler. The experimental results suggest, due to the gradient stress field around the glass bead, the oscillatory distribution of crystallinities around the glass...
The macroscopic alignment of conjugated polymers with low grain boundary is essential to carrier transport. We investigated the formation mechanism of the aligned films of the donor−acceptor copolymer of 3,6-bis(thiophen-2-yl)-N,N′-bis(2-octyl-1-dodecyl)-1,4-dioxo-pyrrolo [3,4-c]pyrrole and thieno- [3,2-b]thiophene (PDBT-TT) by solvent vapor enhanced drop-casting (SVE DC). The dichroic ratio (DR)...
The plastic deformation behavior of isotactic polypropylene (iPP) film is studied with in-situ Fourier transformation infrared microspectroscopic imaging (FTIRI). During uniaxial tensile test, spatial distributions of crystallinity and orientations are obtained in necking region (NR), transition front (TF) and non-necking region (NNR). A low valley of crystallinity exists at TF, while both NNR and...
Submicron fibers with bactericidal properties were prepared from electrospinning of blends containing cellulose acetate (CA) as a polymer base, chlorhexidine (CHX) as a bactericidal agent, and organic titanate Tyzor ® TE (TTE) as a cross-linker. A small amount of high molecular weight poly(ethylene oxide) (PEO) was incorporated into the blends to facilitate the electrospinning, and its effect...
Modification of polyacrylonitrile (PAN) by hydroxylamine resulted in polyacrylamidoxime (PANOx), the oxime groups of which are nucleophilic and capable of hydrolyzing esters. PANOx fiber mats with submicrometer fiber diameters ranging from tens to 300nm were produced by electrospinning a suspension of PANOx blended with PAN (1:1 by weight) in a mixture of N,N-dimethyl formamide (DMF) and dimethyl...
We present a facile method to prepare helical polyaniline (PANI) microwires or rods guided by poly(acrylic acid) (PAA). The average length and diameter of the helical strands were about 3.5μm and 500nm, respectively. The pitch distance was about 400nm. The morphology of the helical PANI microwires was affected by the concentration of PAA. As the concentration was decreased to below 0.05mg/ml, helical...
In this communication, we report for the first time the synthesis of a new electroactive poly(aryl ether ketone) derived from the phenyl-capped aniline tetramer. The general properties are studied by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The polymer has high serving temperature and good thermal stability. And its chemical oxidation process was studied by UV–Vis...
The pervaporation separation of water-alcohol mixture was carried out using grafted terpolymer membrane at -10-50°C. PVA-g-ST/MA-Hz (III) terpolymer was prepared by graft copolymerization of styrene (ST)-maleic anhydride (MA) hydrazine (Hz) copolymer (ST-co-MA-Hz) (II) onto poly(vinyl alcohol) (PVA) by a condensation-coupling reaction through esterification that was performed between the hydroxy...
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