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Fiber formation from highly stretched melt and mechanical deformation of the fiber are investigated by molecular dynamics simulations. Polyethylene molecules of moderate chain length comprising 513 united atoms are simulated under constant temperature and stress (NTτ) conditions. Rapid crystallization into fiber structures of alternating crystalline amorphous layers is observed, where emergence of...
In molecular dynamics (MD) simulation, the crystallization behavior of a polymer nanoglobule was studied as a function of temperature. The crystallinity in the nanoglobule was determined by using the site order parameter method [Macromolecules, 2008, 41: 6733]. The isothermal crystallization kinetics was determined at different temperatures and the rate of crystallization, K c , and the Avrami...
Here we present dielectric relaxation experiments carried out in semicrystalline poly (trimethylene terephthalate) (PTT) samples covering a broad range of crystallinity values. Special attention has been devoted to characterize the two extremes of low and high crystallinity. In particular a high temperature relaxation in the dielectric spectra of highly crystalline PTT, attributed to a Maxwell–Wagner–Sillars...
A significant increase in polymer crystallinity is reported in composites of carbon-nanotubes (CNT) and Poly(3-octylthiophene-2,5-diyl), P3HT and Poly(3-octylthiophene-2,5-diyl), P3OT; Differential scanning calorimetry (DSC) reveal an increase from about 40% crystallinity of the native P3HT to ∼62% in composites containing 25 wt% MWNT. A similar behavior is observed in P3OT with ∼68% crystallinity,...
We have synthesized segmented polyurethane (SPU)/silica nanoparticle (SiNP) nanocomposites with extraordinarily high tensile strength and strain-at-break using an in-situ polymerization method with low SiNP concentrations. A 20-fold increase in strain-at-break compared with the pristine polymer has been achieved for the 0.5 wt% SiNP nanocomposites. A suite of characterization tools including transmission...
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