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Crystals , grown from solution, of the monodisperse 5-amide nylon 6 oligomer (4.6nm long) have been investigated using X-ray diffraction and electron microscopy. If the crystals are prepared by adding the miscible non-solvent 1,4 dioxane to a solution in trifluoroethanol the usual nylon 6 monoclinic α-structure occurs, i.e. a structure where the hydrogen-bonded sheets shear in an alternating fashion...
The limits of detection of phase separation in linear/branched polyethylene systems have been investigated, using the very sensitive but indirect experimental methods developed at the University of Bristol. A linear polyethylene has been blended with a number of very lightly branched ethylene-octene and ethylene-butene copolymers (containing between 0.7 and 3.1 mol% of copolymer). Samples of blends...
Polyethylene samples, crystallized from the melt both by quenching and by isothermal crystallization at each of five different temperatures, have been characterized by small-angle X-ray scattering (SAXS) to monitor the lamellar separation. The same materials were prepared for transmission electron microscopy using two different specimen preparation techniques: fixation with chlorosulfonic acid, followed...
The coarsening of phase-separated domains in a molten blend of two ethylene-octene copolymers has been observed by studying electron micrographs of rapidly quenched samples. Blends containing 10% of a 2 mol% ethylene-octene copolymer (with 90% of an 8 mol% ethylene-octene copolymer) were held in the melt for various times at a temperature at which phase separation was known to take place. The diameters...
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