Bulk and surface compression viscosities of high and low density polyethylenes

✍ Scribed by J. V. Aleman

• Publisher: Society for Plastic Engineers
• Year: 1990
• Tongue: English
• Weight: 642 KB
• Volume: 30
• Category: Article
• ISSN: 0032-3888
• DOI: 10.1002/pen.760300603

✦ Synopsis

Abstract

Bulk compression flow of high density polyethylene (HDPE) and low density polyethylene (LDPE) have been measured at temperatures of 423 to 463K, pressure up to 150 MPa, and bulk compression rates of about 1.0 to 200.00 × 10^−5^ s^−1^. Bulk and surface compression modulus of elasticity (L and K~s~), longitudinal bulk compression viscosity (η~L~), and surface compression viscosity (η) are described as a function of compression rates (k~v~ and k~s~), compression deformations (k~v~ percent and K~s~ percent), and temperature (T). Bulk and surface compression flow activation energies are of the order of 40 to 100 KJ/mol and 3.84 KJ/mol, respectively.