Type: Article
Title: Extrusion foaming behavior of polybutene-1. Toward single-material multifunctional sandwich structures
Authors: Doyle Gutierrez, Lucia 
Issue Date: 20-Mar-2022
Keywords: extrusion; foams; polyolefins; circular economy; circular product design
Polymeric foams are a key element of many multifunctional sandwich structures. The most commonly used polymeric foam, polyurethane, presents environmental drawbacks, related to poor recyclability and the use of toxic diisocyanates for their manufacturing. The separation of layers in sandwich structures is a further unresolved hurdle toward the recyclability of these elements. There is a need for broadening the spectrum of polymeric foams. In this context, the foamability of polybutene-1 (PB-1) is studied through extrusion foaming experiments. From the application side, foaming PB-1 would allow the manufacturing of district heating pre-insulated pipes out of one single material, bringing circular product design to the energy sector. From the scientific side, there is a knowledge gap in the foaming of polymers in the rubbery state at room temperature, such as PB-1, due to difficulties in the cell stabilization step. This supports the need for research in the foaming of this polymer. In this study, four commercial grades of PB-1 were evaluated, covering different chain structures, molecular weights, and crystallinity degrees. Very different foaming behaviors were found. Dimensionally stable foams were achieved with the two homopolymers tested, demonstrating the foamability of this polymer.
Subject Class (DDC): 624: Ingenieurbau und Umwelttechnik
HCU-Faculty: Technisches Infrastrukturmanagement 
Journal or Series Name: Journal of Applied Polymer Science 
Volume: 139
Issue: 12
Publisher: Wiley
ISSN: 1097-4628
Publisher DOI: 10.1002/app.51816
URN (Citation Link): urn:nbn:de:gbv:1373-repos-10639
Directlink: https://repos.hcu-hamburg.de/handle/hcu/834
Language: English
Creative Commons License: https://creativecommons.org/licenses/by-nc/4.0/
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