Detail publikačního výsledku
Effect of processing on the lifetime of pipe HDPE grade
NEZBEDOVÁ, E.
Original Title
Effect of processing on the lifetime of pipe HDPE grade
English Title
Effect of processing on the lifetime of pipe HDPE grade
Type
Paper in proceedings (conference paper)
Original Abstract
The influence of processing conditions on molecular structure and microstructure of highdensity polyethylene pipe material has been studied. By modifying the segment arrangement and package of additives, conditions during pelletising in the extruder have been changed. Structural analyses obtained by gel permeation chromatography (GPC), infra-red spectroscopy (FTIR) and elution fractionation (TREF) were correlated with mechanical characteristics obtained from full notch creep (FNCT) test and modified plane strain impact Charpy tests (PSI). The structural factors underlying this correlation are discussed. A correlation between the structural parameters and fracture processes has been found. Specifically, the ability to minimise the energy input in the course of polymer powder processing appears to provide good resistance to slow crack growth, whereas the degree of crystallinity and lamellar thickness play a decisive role in the rapid crack propagation process.
English abstract
The influence of processing conditions on molecular structure and microstructure of highdensity polyethylene pipe material has been studied. By modifying the segment arrangement and package of additives, conditions during pelletising in the extruder have been changed. Structural analyses obtained by gel permeation chromatography (GPC), infra-red spectroscopy (FTIR) and elution fractionation (TREF) were correlated with mechanical characteristics obtained from full notch creep (FNCT) test and modified plane strain impact Charpy tests (PSI). The structural factors underlying this correlation are discussed. A correlation between the structural parameters and fracture processes has been found. Specifically, the ability to minimise the energy input in the course of polymer powder processing appears to provide good resistance to slow crack growth, whereas the degree of crystallinity and lamellar thickness play a decisive role in the rapid crack propagation process.
Keywords
HDPE, fracture, processing
Key words in English
HDPE, fracture, processing
Authors
NEZBEDOVÁ, E.
Released
02.10.2006
Publisher
Plastics Pipes conference association
Location
Washington
Book
sborník
Pages from
3B
Pages count
5
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