RT info:eu-repo/semantics/article
T1 Effect of the molecular structure of TPU on the cellular structure of nanocellular polymers based on PMMA/TPU blends
A1 Sánchez Calderón, Ismael
A1 Bernardo García, Victoria
A1 Santiago Calvo, Mercerdes
A1 Naji, Haneen
A1 Saiani, Alberto
A1 Rodríguez Pérez, Miguel Ángel
K1 Polímeros
K1 Thermoplastics
K1 Molecular structure
K1 Materials science
K1 Ciencia de los materiales
K1 3312 Tecnología de Materiales
AB In this work, the effects of thermoplastic polyurethane (TPU) chemistry and concentrationon the cellular structure of nanocellular polymers based on poly(methyl-methacrylate) (PMMA) arepresented. Three grades of TPU with different fractions of hard segments (HS) (60%, 70%, and 80%)have been synthesized by the prepolymer method. Nanocellular polymers based on PMMA havebeen produced by gas dissolution foaming using TPU as a nucleating agent in different contents(0.5 wt%, 2 wt%, and 5 wt%). TPU characterization shows that as the content of HS increases, thedensity, hardness, and molecular weight of the TPU are higher. PMMA/TPU cellular materials showa gradient cell size distribution from the edge of the sample towards the nanocellular core. In thecore region, the addition of TPU has a strong nucleating effect in PMMA. Core structure depends onthe HS content and the TPU content. As the HS or TPU content increases, the cell nucleation densityincreases, and the cell size is reduced. Then, the use of TPUs with different characteristics allowscontrolling the cellular structure. Nanocellular polymers have been obtained with a core relativedensity between 0.15 and 0.20 and cell sizes between 220 and 640 nm.
PB MDPI
SN 2073-4360
YR 2021
FD 2021
LK https://uvadoc.uva.es/handle/10324/55068
UL https://uvadoc.uva.es/handle/10324/55068
LA eng
NO Polymers 2021, Vol.13, Nº.18, 18 pp.
NO Producción Científica
DS UVaDOC
RD 28-nov-2024