Preferential Orientation of Poly(ethylene 2,6-naphthalate) Melt-Crystallized on the Friction-Transfer Layer of PTFE.

Abstract

Solution-cast

Phase Separation and Crystallization in High Hard Block Content Polyurethane Thin Films

“…Transmission electron microscopy (TEM) analysis was carried out for morphology and crystallinity investigations using a JEOL 2010 LaB 6 microscope operated at 100 kV. To prepare the samples for TEM, a poly­(acrylic acid) (PAA) detachment method was used . A small drop of PAA solution (35 wt % in water) was placed on a TPU film and dried.…”

Morphological study by TEM on uniaxially oriented thin films of PET, PEN and their blends

“…In our previous reports [23,39,40], morphologies of PEN which had been isothermally crystallized after being melted at 300 8C were examined: the morphology of PEN thin films which had been crystallized at 190 8C under a static condition (namely, without shear strain) [39], that of PEN which had been epitaxially crystallized at 190 8C on the friction-transfer thin layer of polytetrafluoroethylene [23], and those of PEN thin films which had been crystallized at temperatures ranging from 190 to 240 8C [40]. In particular, the (010) a lattice images, in which the lattice fringes of 0.57 nm spacing were clearly recognized, were successfully obtained by high-resolution TEM [22,41] of the PEN thin film melt-crystallized isothermally at 190 8C [40].…”

“…A drop (a hemisphere 3-4 mm in diameter) of aqueous solution (ca. 25%) of polyacrylic acid (PAA) [23] was placed on the appropriate portion of the specimen film on the glass slide and hardened by drying for one day at room temperature. Hardened PAA with the specimen film was detached from the glass slide, and then the PAA was dissolved in water.…”

Morphological study by TEM on uniaxially oriented thin films of PBT

“…Then, with the aid of the aqueous solution (ca. 25%) of polyacrylic acid (PAA) [17], the appropriate portion of the specimen film was transferred to and mounted on a copper grid for TEM.…”