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Polymers 2017, 9(9), 442; https://doi.org/10.3390/polym9090442

Influence of the Molar Mass on Long-Chain Branching of Polypropylene

1
Institute of Material Science and Technology, TU Wien, Getreidemarkt 9, Vienna 1060, Austria
2
Institute of Applied Synthetic Chemistry, TU Wien. Getreidemarkt 9, Vienna 1060, Austria
3
Pergan GmbH, Schlavenhorst 71, Bocholt 46395, Germany
*
Author to whom correspondence should be addressed.
Received: 21 August 2017 / Revised: 7 September 2017 / Accepted: 11 September 2017 / Published: 12 September 2017
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Abstract

Long-chain branching (LCB) with peroxydicarbonates (PODIC) is known as a suitable post-reactor process to introduce strain-hardening behaviour and an increase of melt strength to a linear polypropylene (PP). This opens up new possibilities for processing and therefore application. Especially in the case of adding value to PP post-consumer waste, LCB is a promising approach. LCB takes place by a combination of chain scission and recombination after radical activation of the PP macromolecule. However, chemical modification of post-consumer waste is challenging because of the inhomogeneous composition and the manifold number of PP grades. The influence of the molar mass of the linear PP precursor on this reaction was studied with different PP grades ranging from extrusion grade to injection moulding grade. To exclude side effects, all PP grades had similar polydispersity indices. A PP with higher molar mass undergoes significant chain scission during the LCB process compared to a PP with low molar mass for injection moulding. Therefore, the two grades differ significantly in their branching number, which influences their behaviour in elongational flow. View Full-Text
Keywords: long-chain branching; polypropylene; recycling long-chain branching; polypropylene; recycling
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Kamleitner, F.; Duscher, B.; Koch, T.; Knaus, S.; Schmid, K.; Archodoulaki, V.-M. Influence of the Molar Mass on Long-Chain Branching of Polypropylene. Polymers 2017, 9, 442.

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