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Poster

Impact resistant foams based on PP/POE blends

Wednesday (24.10.2018)
19:27 - 19:30
Part of:
Line-Up:
- Poster Battery housings for electric vehicles using CFRP and aluminium foam 0 Joachim Baumeister
- Poster Manufacturing and characterization of open-cell stainless steel foams by investment casting 1 Jan Frömert
- Poster Interface formation of Mg2X (X = Si, Sn) in cellular Si infiltrated by Mg(Sn) alloys 1 Alexander M. Matz
- Poster Production of microcellular PMMA using the bead foaming technology 1 Mikel Mugica
- Poster Nanocellular PMMA with tunable cellular structure by changing the rheological behaviour of the polymer matrix. 1 Judith Martín de León
- Poster Production of thermoplastic polyurethane foams synthesized with different contents of hard segment and graphene nanoplatelets by the gas dissolution foaming process 1 Ph.D. Mercedes Santiago-Calvo
- Poster Surface functionalized filters for aluminum melt filtration 1 Dr.-Ing. Claudia Voigt
- Poster Nanocellular polymers based on PMMA/sepiolite nanocomposites: characterization of the mechanical behaviour 1 Victoria Bernardo
- Poster Impact resistant foams based on PP/POE blends 1 Ph.D. Santiago Munoz Pascual
- Poster Crosslinked open cell ethylene butyl acrylate copolymer (EBA) foams: properties and applications 1 Ph.D. Eduardo López
- Poster Influence of molecular weight in the solubility,diffusivity and the subsequent cellular structure of polystyrene foams 1 Ph.D. Alberto Ballesteros
- Poster Crushing strength measurement at reticulated ceramic foams ex situ and in situ CT analysis 1 Dr.-Ing. Claudia Voigt
- Poster Initiation of plateau region during compression test of porous metals with aligned unidirectional pores 1 Tomoya Tamai
- Poster Active meta-materials with adjustable pore size 1 Dr. Reza Hedayati
- Poster Polymeric foams 3D numerical mechanical modelling 1 Stefano Tagliabue
- Poster Characterisation of NiTi cellular materials fabricated by the powder-metallurgy spaceholder technique 1 Dr. Karl Dahm
- Poster Accurate separation of open cell metal foams using remote laser cutting technique 1 Robert Baumann
- Poster Generation of artificial foam structures and evaluation of their thermo-mechanical, flow and filtration characteristics (Poster) 1 Christoph Settgast
- Poster Surface modification of magnesium-based foams by Directed Plasma Nanosynthesis 1 Viviana Marcela Posada Pérez

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Polypropylene (PP) is a polymer with excellent properties such as easy processability, good stiffness and strength, high thermal stability or excellent chemical resistance, but with low ductility especially when it is foamed. In the case of PP compounds, ductile solids become brittle foams even for very low expansion ratios. Thus the objective of this work is to implement different strategies allowing improving the ductility of foams, and avoiding the ductile to brittle transition when the material is foamed.

 

It is well known that impact resistance of solid materials can be modified by the incorporation of rubber type materials. It is reported in the literature that the inclusion of such secondary phases allows improvements in the strain and the energy at break with respect to those presented by unfilled solid polypropylene. Taking this fact into account, different types of elastomers such as poly(styrene–ethylene–butylene–styrene) (SEBS), ethylene–propylene rubber (EPR), ethylene propylene–diene monomer elastomer (EPDM) or poly(ethylene-co-octene) (POE) has been used in the existent literature to improve the impact behavior of unfoamed PP. It is known that the critical parameter that determines the toughness of these materials is the distance between the surface of the elastomer particles (matrix ligament thickness or interparticle distance), existing a critical value of this parameter below the ductile behavior appears. This occurs due to a plane-strain to plane-stress transition during the cavitation of the elastomer particles [9].

 

However, as far as the author knows, there are not previous publications in which the impact response of foams produced from a PP containing a rubber phase are studied. Therefore, in this work, a commercial PP with low impact strength has been blended with a polyolefin elastomer (POE) using different extrusion conditions. The produced solids have been foamed using the Improved Compression Moulding (ICM) technique and azodicarbonamide as chemical blowing agent, obtaining foams with an expansion ratio of 1.5. The cellular structure and dispersion of the rubber phase have been analyzed using SEM. The impact resistance has been tested using Notched Izod Impact and instrumented Falling Weight Impact (IFWI), achieving promising results.

Speaker:
Ph.D. Santiago Munoz Pascual
University of Valladolid
Additional Authors:
  • Dr. Cristina Saiz-Arroyo
    CellMat Technologies S.L.
  • Prof. Dr. Miguel Ángel Rodríguez-Pérez
    University of Valladolid