Polymer Engineering and Science articles from November 2003

Polymer Engineering and Science archives from November 2003

Structure-property relationships of blends of polycarbonate.
November 1, 2003... INTRODUCTION Polycarbonate (PC) is one of the most widely used polymeric materials for the thermal processing of articles requiring exceptional transparency, toughness and heat resistance. The combination of good mechanical and optical...

Relationship between segment structures and elastic properties of segmented poly(urethane-urea) elastic fibers.
November 1, 2003... INTRODUCTION Recently, many types of polyurethane elastomers have been manufactured and used in various fields. Among these elastomers. SPUU polymers are synthesized to be used as fibers. These SPUUs are block copolymers composed of soft...

Measurements of the thermal conductivity and thermal diffusivity of polymers.
November 1, 2003... INTRODUCTION Although a number of correlations associating such structural variables as molecular weight of the polymer, crystallinity, orientation, etc. with thermal conductivity have been proposed (1-3), accurate measurements of thermal...

Spinning and drawing properties of ultrahigh-molecular-weight polyethylene fibers prepared at varying concentrations and temperatures.
November 1, 2003... INTRODUCTION The specific strengths (strength divided by the specific gravity) of ultrahigh-molecular-weight (UHMWPE) fibers exceed those of carbon and aramid fibers, because of the successful invention of fibrillar-crystal-growing (1) and...

A rheological and morphological model for blends of flexible and rigid macromolecules.
November 1, 2003... INTRODUCTION Blends of thermoplastic polymers (TPs) and liquidcrystalline polymers (LCPs) have generated some intense interest over the past decade because of several advantages they offer relative to conventional TPs or blends of these...

Effect of wall slip on blown film thickness distribution.
November 1, 2003... INTRODUCTION Blown film processing technology has been widely utilized to manufacture polymer film products. The main concern for blown film manufacturers is film thickness distribution in the circumferential direction because the...

Mechanical properties and structural characteristics of dynamically photocrosslinked PP/EPDM blends*.
November 1, 2003... INTRODUCTION Polypropylene (PP) as a thermoplastic is widely used in many fields, such as building materials, furniture, automobiles, the toy industry, and so on. However, its main disadvantage is its poor impact resistance, especially at...

Water-assisted injection molding of thermoplastic materials: effects of processing parameters.
November 1, 2003... INTRODUCTION A newly developed water-assisted injection molding technology (1) has received extensive attention in recent years, owing to its light weight, relatively lower resin cost per part, faster cycle time, and its flexibility in the...