Additive-like amounts of HDPE prevent creep of molten LDPE: Phase-behavior and thermo-mechanical properties of a melt-miscible blend

Mattias Andersson, Jonna Hynynen, Mats R. Andersson, Per-Ola Hagstrand, Thomas Gkourmpis, Christian Muller

    Research output: Contribution to journalArticle

    16 Citations (Scopus)

    Abstract

    Low-density polyethylene (LDPE) is the preferred type of polyolefin for many medical and electrical applications because of its superior purity and cleanliness. However, the inferior thermo-mechanical properties as compared to, for example, high-density polyethylene (HDPE), which arise because of the lower melting temperature of LDPE, constitute a significant drawback. Here, we demonstrate that the addition of minute amounts of HDPE to a LDPE resin considerably improves the mechanical integrity above the melting temperature of LDPE. A combination of dynamic mechanical analysis and creep experiments reveals that the addition of as little as 1 to 2 wt% HDPE leads to complete form stability above the melting temperature of LDPE. The investigated LDPE/HDPE blend is found to be miscible in the melt, which facilitates the formation of a solid-state microstructure that features a fine distribution of HDPE-rich lamellae. The absence of creep above the melting temperature of LDPE is rationalized with the presence of tie chains and trapped entanglements that connect the few remaining crystallites.

    Original languageEnglish
    Pages (from-to)146-156
    Number of pages11
    JournalJournal of Polymer Science Part B: Polymer Physics
    Volume55
    Issue number2
    DOIs
    Publication statusPublished - 2017

    Fingerprint Dive into the research topics of 'Additive-like amounts of HDPE prevent creep of molten LDPE: Phase-behavior and thermo-mechanical properties of a melt-miscible blend'. Together they form a unique fingerprint.

  • Cite this