The continually growing plastics market consists of more than
250 million tons of product annually, making the recurring problem
of polymer melt fracture an acute issue in the extrusion of these
materials. Presenting a pictorial library of the different forms of
melt fracture and real industrial extrusion melt fracture
phenomena, Polymer Melt Fracture provides pragmatic identification
and industrial extrusion defect remediation strategies based on
detailed experimental and theoretical findings from the last 50
years.
Distinct microscopic photos
Each chapter in this comprehensive volume covers a different
aspect of the science and technology relating to polymer melt
fracture. The book begins with a collection of optical and scanning
electron microscopy pictures. These photos show distorted capillary
die extrudates for a number of commercially available polymers. The
authors present a brief introduction to the basic science and
technology of polymers. They explain what polymers are, how they
are made, and how they can be characterized. They also discuss
polymer rheology, review the principles of continuum mechanics, and
define linear viscoelastic material functions.
Techniques for observing and measuring fracture
Next, the book explains how polymer melt fracture is actually
experienced in the polymer processing industry. It explains the
various ways polymer melt fracture may appear during polymer melt
processing in different extrusion processes. The authors provide
comprehensive reviews of the polymer melt fracture literature, with
chapters on experimental findings and the techniques used to
observe and measure polymer melt fracture, and the influence of
polymer architecture and polymer processing conditions on the onset
and types of polymer melt fracture. Posing a hypothesis about the
phenomenon, the book presents the current understanding of polymer
melt fracture.
Mathematical equations
Recognizing the importance of models for simulations that may
indicate potential solutions, the book discusses aspects of
non-linear constitutive equations and microscopic theory and
develops a macroscopic model, explaining the capabilities and
limitations of this approach. The book presents an overview of
pragmatic tools and methods that have been used to prevent the
appearance of polymer melt fracture and explains how to use them to
suppress defects.
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