Environment Stress Cracking of Polyethylene and Polyethylene Communication Cable Sheath

Environmental Stress Crack Resistance Of Polyethylene

Introduction to Environmental Stress Cracking and ESCR Over the past decade, high-density polyethylene (HDPE) materials have improved significantly and now meet more stringent performance standards; some performance evaluation tests that once took only days to run now take months with today’s resins. One such performance criteria is Environmental Stress Crack Resistance (ESCR). Because standard...

Stress-Induced Infrared Frequency Shifts in Polyethylene

The molecular dynamics technique is used to study the spectral response of a polyethylene chain in a crystal environment under a mechanical deformation. The MUSIC method, which was previously shown to accurately compute dispersion curves from the time-dependent structure factor, is used. A complete characterization of frequency shifts is presented for various lamellar thickness, temperatures, s...

Creep and Stress Relaxation Behavior of Polypropylene, Metallocene-Prepared Polyethylene and their Blends

Effects of Tibial Insert Slope on Polyethylene Wear and Stress

INTRODUCTION: Both posterior stabilized (PS) and cruciate retaining (CR) total knee replacement systems have demonstrated high rates of survivorship, high clinical knee scores and high patient satisfaction scores for decades. However, CR total knees sometimes exhibit more varied kinematics and a smaller range of motion than similar PS knees. Many factors can cause this, but one important factor...

Degradation of degradable starch-polyethylene plastics in a compost environment.

The degradation performance of 11 types of commercially produced degradable starch-polyethylene plastic compost bags was evaluated in municipal yard waste compost sites at Iowa State University (Ames) and in Carroll, Dubuque, and Grinnell, Iowa. Masterbatches for plastic production were provided by Archer Daniels Midland Co. (Decatur, Ill.), St. Lawrence Starch Co. Ltd. (Mississauga, Ontario, C...