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

Mattias Andersson (Institutionen för kemi och kemiteknik, Polymerteknologi) ; Jonna Hynynen (Institutionen för kemi och kemiteknik, Polymerteknologi) ; Mats R. Andersson (Institutionen för kemi och kemiteknik, Polymerteknologi) ; Per Ola Hagstrand ; Thomas Gkourmpis ; Christian Müller (Institutionen för kemi och kemiteknik, Polymerteknologi)
Journal of Polymer Science Part B: Polymer Physics (0887-6266). Vol. 55 (2017), 2, p. 146-156.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: creep, miscible polyethylene blend, phase behavior, thermo-mechanical properties, tie chains



Denna post skapades 2017-01-30. Senast ändrad 2017-03-22.
CPL Pubid: 247887

 

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Institutioner (Chalmers)

Institutionen för kemi och kemiteknik, Polymerteknologi

Ämnesområden

Kemi

Chalmers infrastruktur

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