Cold crystallization of poly(ethylene naphthalene-2,6-dicarboxylate) by simultaneous measurements of X-ray scattering and dielectric spectroscopy

Localized translational motions in semicrystalline poly(ethylene terephthalate) studied by incoherent quasielastic neutron scattering

One of the simplest ways to confine polymeric materials is by self-assembling during the crystallization process. The remaining amorphous phase is then constrained by the lamellar crystals. In this manuscript, we aim to shed additional light in the understanding of the amorphous chains dynamics of semicrystalline polymers above the Tg by using incoherent quasielastic neutron scattering QENS in a nanoscopic time scale (10(-9)-10(-10)s) on poly(ethylene terephthalate). The observed dynamics is satisfactorily described by a theoretical model that considers that the proton mobility follows a random jump-diffusion in a restricted environment. We demonstrate that the combination of macroscopic with nanoscopic dynamic tools allows a complete description of the confined dynamics on a paradigmatic semicrystalline polymer like poly(ethylene terephthalate).

Surface and thermodynamic characterization of conducting polymers by inverse gas chromatography

Inverse gas chromatography was used to characterize both doped, the undoped polyaniline (PANI), and its blend with nylon-6 using 27 solutes. The change in the morphology of these polymers was detected between 80 and 180 degrees C and was complemented by the degree of crystallinity. Delta H1(s)values of all solutes - pure polymers were found endothermic and exothermic for the blend. The X'23 depended on the chemical nature of solutes; a correction measure was not successful in obtaining the true values of X'23. X'23 showed a phase separation of the blend (60:40 w/w) between 80 and 180 degrees C. Blending nylon-6 with PANI has lowered the dispersive surface energy of PANI while increasing the surface energy of nylon-6.