Improved polypropylene thermoformability through polyethylene layering

Laryssa Meyer, Alex Jordan, Kyungtae Kim, Bongjoon Lee, Frank S. Bates, Chris Macosko, Ehsan Behzedfar, Olivier Lhost

Research output: Contribution to conferencePaperpeer-review


While the flow forces governing primary melt-based polymer processing techniques, such as extrusion and injection molding, have been extensively studied, characterization of forces in secondary processes such as thermoforming is limited. In this work we utilize multilayer coextrusion to create an extruded film with 100s of alternating linear low density polyethylene (LLDPE) and isotactic polypropylene (iPP) layers; and by extension, 100s of interfaces. The combination of LLDPE, iPP, and these interfaces decreases the elastic storage modulus (E') and broadens the rubbery plateau observed via dynamic mechanical analysis (DMA). The broadening of the rubber plateau is correlated with an observed improvement in LLDPE/iPP multilayer thermoformability compared to the homopolymer LLDPE and iPP films.

Original languageEnglish (US)
StatePublished - 2021
Event2021 SPE Annual Technical Conference, ANTEC 2021 - Virtual, Online
Duration: May 10 2021May 21 2021


Conference2021 SPE Annual Technical Conference, ANTEC 2021
CityVirtual, Online

Bibliographical note

Funding Information:
This research was supported by a grant from Total S. A. with partial support by the Industrial Partnership for Research in Interfacial & Materials Engineering (IPRIME). Polymers were graciously provided by Total S. A. and ExxonMobil Corporation.

Publisher Copyright:
© 2021 Society of Plastics Engineers. All rights reserved.


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