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      Rheology and Extrusion Foaming of Partially Crosslinked Thermoplastic Vulcanizates Silicone

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          Abstract

          This work focuses on the foaming behavior of thermoplastic vulcanized silicones (TPVs) in which partially crosslinked silicone nodules are dispersed. In these TPVs, silicone nodules dispersed in a low density polyethylene (LDPE) phase have an average size of about 1 μm. The crosslinking densities of the elastomer phase were selected according to their viscoelastic behavior. Surprisingly, linear and non-linear shear rheology appeared more sensitive to formulations than extensional rheology. Indeed, each formulation has an extensional rheological behavior similar to that of pure LDPE and meets the requirements for foaming applications in terms of elongation at break and melt strength. In accordance with non-linear shear rheology, the foaming behavior of these formulations has been correlated to extrusion foaming parameters that are known to control nucleation, i. e. pre-die pressure and die exit depressurization rate. With an appropriate crosslinking density of silicone nodules, the TPV foamability tends to the foamability of pure LDPE to reach a foam density of 0.54 g/cm 3 with an average cell size of 140 ± 50 μm and a cell density of 3 × 10 5 cells/cm 3. Since partially crosslinked silicone nodules cannot foam, it is assumed that they improve nucleation while allowing sufficient expansion of the LDPE phase.

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          Most cited references 37

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                Author and article information

                Journal
                ipp
                International Polymer Processing
                Carl Hanser Verlag
                0930-777X
                2195-8602
                13 August 2019
                : 34
                : 4
                : 445-456
                Affiliations
                1 Ingénierie des Matériaux Polymères, Université Lyon 1, CNRS UMR 5223, Villeurbanne, France
                2 Hutchinson Research Centre, Chalette sur Loing, France
                Author notes
                [* ] Correspondence address, Mail address: Philippe Cassagnau, Ingénierie des Matériaux Polymères, Université Lyon 1, CNRS UMR 5223, 15 Bd. Latarjet, 69622 Villeurbanne, France, E-mail: philippe.cassagnau@ 123456univ-lyon1.fr
                Article
                IPP3741
                10.3139/217.3741
                © 2019, Carl Hanser Verlag, Munich
                Page count
                References: 53, Pages: 12
                Product
                Self URI (journal page): http://www.hanser-elibrary.com/loi/ipp
                Categories
                Regular Contributed Articles

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