RT info:eu-repo/semantics/article
T1 Highly anisotropic crosslinked HDPE foams with a controlled anisotropy ratio: Production and characterization of the cellular structure and mechanical properties
A1 Bernardo García, Victoria
A1 Laguna Gutiérrez, Ester
A1 López Gil, Alberto
A1 Rodríguez Pérez, Miguel Ángel
AB In this paper a two-step foaming process was used to produce highly anisotropic foams with controlled anisotropyratio. Anisotropic cellularmaterials are of great interest due to the enhanced mechanical properties that they showin the anisotropy direction. Therefore, the production of foams with high and controlled anisotropy ratios is an essentialtopic when it comes to designmaterialswith goodmechanical performance. In thiswork, high density polyethylene(HDPE) foams with anisotropy ratios larger than 3 have been produced. A foaming process consisting oftwo consecutive heating steps: pre-foaming and foaming, has been employed. Foaming kinetics at four differentpre-foaming temperatures (145 °C, 155 °C, 170 °C and 180 °C) and at a constant foaming temperature (180 °C)have been performed. Results showed that the pre-foaming temperature is the key parameter that allows controllingthe anisotropy ratio of the final foam. A relationship between the pre-foaming temperature, the number of cellsand the anisotropy ratio has been established. Low pre-foaming temperatures lead to low numbers of cells, whicheventually results in high anisotropy ratios. Mechanical properties in compression were measured and comparedwith the anisotropy of the cellular structure, being that the elastic modulus increases with the anisotropy ratio.
PB Elsevier
YR 2017
FD 2017
LK http://uvadoc.uva.es/handle/10324/25881
UL http://uvadoc.uva.es/handle/10324/25881
LA eng
NO Materials and Design 114 (2017) 83–91
NO Producción Científica
DS UVaDOC
RD 24-nov-2024