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 journalArticlepeer-review

    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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