Influence of Molecular Weight on the Creep Resistance of Almost Molten Polyethylene Blends

Andersson, Mattias, 1985 (author): Chalmers tekniska högskola,Chalmers University of Technology

Städler, Roman (author): Chalmers tekniska högskola,Chalmers University of Technology

Andersson, Mats, 1966 (author): Chalmers tekniska högskola,Chalmers University of Technology,University of South Australia

Müller, Christian, 1980 (author): Chalmers tekniska högskola,Chalmers University of Technology

(creator_code:org_t)

2017-05-16
2018
English.
In: Macromolecular Chemistry and Physics. - : Wiley. - 1022-1352 .- 1521-3935. ; 219:3

Related links:: https://doi.org/10.1...; show more...; https://research.cha...; show less...

Abstract Subject headings

The most common route to improve the creep resistance of low density polyethylene (LDPE) is crosslinking, which however results in volatile decomposition products that must be removed. Blends of LDPE and an additive-like amount of a linear polyethylene are found to offer improved creep resistance. Above the melting temperature of LDPE, T m ≈ 111 °C, a load-bearing network of higher-melting crystallites—connected through tie chains and trapped entanglements—provides additional form stability. The molecular weight of the linear polyethylene is found to be critical for the ability to arrest creep, which is correlated with the probability of tie chain formation as well as cocrystallization of the two polyethylenes. A number of high-density polyethylenes (HDPE) and one ultrahigh molecular weight polyethylene (UHMW-PE) are explored. For blends of LDPE and 2 wt% of the linear polyethylene, an HDPE with a weight-average molecular weight M w of 16 kg mol −1 is found to be sufficient to arrest creep at 115 °C. Further improvement in terms of creep resistance is obtained in case of UHMW-PE with creep fracture occurring only at a stress of 12 kPa at 115 °C. (Figure presented.).

NATURVETENSKAP -- Kemi -- Polymerkemi (hsv//swe)
NATURAL SCIENCES -- Chemical Sciences -- Polymer Chemistry (hsv//eng)
TEKNIK OCH TEKNOLOGIER -- Kemiteknik -- Polymerteknologi (hsv//swe)
ENGINEERING AND TECHNOLOGY -- Chemical Engineering -- Polymer Technologies (hsv//eng)
NATURVETENSKAP -- Kemi -- Annan kemi (hsv//swe)
NATURAL SCIENCES -- Chemical Sciences -- Other Chemistry Topics (hsv//eng)

By the author/editor: Andersson, Matti ...; Städler, Roman; Hagstrand, Per O ...; Gkourmpis, Thoma ...; Andersson, Mats, ...; Müller, Christia ...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Polymer Chemistr ...

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Chemical Enginee ...; and Polymer Technolo ...

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Other Chemistry ...

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