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 language||English (US)|
|State||Published - 2021|
|Event||2021 SPE Annual Technical Conference, ANTEC 2021 - Virtual, Online|
Duration: May 10 2021 → May 21 2021
|Conference||2021 SPE Annual Technical Conference, ANTEC 2021|
|Period||5/10/21 → 5/21/21|
Bibliographical noteFunding 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.
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