Molecular modification of slightly cross-linked HDPE

comparison of electron beam irradiation and peroxide treatments

Alireza Bahramzadeh*, Andrew C. Try

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The aim of this study is to investigate the changes in molecular structure of high density polyethylene after slightly cross-linking with either electron beam irradiation or chemically with the peroxide method, by examining both the gel and sol parts of the polymer. Melt flow index and dynamic mechanical thermal analysis tests verify the cross-linking process after each treatment method. Differential scanning calorimetry and Fourier transformed infrared tests, together with rheology and viscometry tests, show that the cross-linking process has resulted in not only cross-linking long chains but also chain scission of short chains, thus broadening the molecular weight distribution. Because these created short chains act like lubricants, cross-linked chains flow easier. Therefore, the polymer remains processable according to the melt flow index test, and this will make the usage of slightly cross-linked high density polyethylene in injection molding processes possible.

Original languageEnglish
Pages (from-to)1422-1429
Number of pages8
JournalPolymers for Advanced Technologies
Volume27
Issue number11
DOIs
Publication statusPublished - 1 Nov 2016

Keywords

  • slightly cross-linking
  • processability
  • crystalline size
  • chain scission
  • rheology

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