Properties of polypropylene fibers made from polymer homologue mixtures

Abstract

SYNOPSISFibers from mixtures of two polypropylene types were produced with the same conditions. The polymer base was a normal fiber grade polymer to which a high molecular weight polypropylene was added in amounts of 25,50, and 75%. The extensibility of the fibers changed considerably by increasing the high polymer amount. The tensile properties were measured and compared with measured structural properties, such as crystallinity, crystalline particle size, amorphous orientation, amorphous region derived from small and wide-angle X-ray scattering. New terms, the specific amorphous orientation and the structural deformability index, were proposed, and it was shown that the tensile properties, i.e., strength, elongation at break, initial modulus and sonic modulus, are in very good correlation with them.

Durability Performance of Polymer-Concrete Composites in a Diffusion-Dominated Process

“…They do not absorb water due to a hydrophobic surface which prevents any chemical adhesion with the concrete matrix; they are non-corrosive and compatible with all types of cements and admixtures. They do not affect concrete mix design, pumpability, placing, setting time and finishing surface characteristics (Geleji et al, 1977, Brandt, 2008.…”

Dimensional instabilities of polyester and polyolefin films as origin of delamination in laminated multilayer

“…They recover the entropy that was reduced by the drawing process. This primarily concerns the amorphous segment orientation and amorphous chain extension . It is likely that lamellar crystals and their orientation also alters the films shrinkage.…”

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