RT info:eu-repo/semantics/article
T1 Nanocellular Polymers with a Gradient Cellular Structure Based on Poly(methyl methacrylate)/Thermoplastic Polyurethane Blends Produced by Gas Dissolution Foaming
A1 Bernardo García, Victoria
A1 Martín de León, Judit
A1 Sánchez Calderón, Ismael
A1 Laguna Gutiérrez, Ester
A1 Rodríguez Pérez, Miguel Ángel
AB Graded structures and nanocellular polymers are two examples of advancedcellular morphologies. In this work, a methodology to obtain low-densitygraded nanocellular polymers based on poly(methyl methacrylate) (PMMA)/thermoplastic polyurethane (TPU) blends produced by gas dissolutionfoaming is reported. A systematic study of the effect of the processing condition is presented. Results show that the melt-blending results in a solidnanostructured material formed by nanometric TPU domains. The PMMA/TPU foamed samples show a gradient cellular structure, with a homogeneous nanocellular core. In the core, the TPU domains act as nucleatingsites, enhancing nucleation compared to pure PMMA and allowing thechange from a microcellular to a nanocellular structure. Nonetheless, theouter region shows a gradient of cell sizes from nano- to micron-sized cells.This gradient structure is attributed to a non-constant pressure profile in thesamples due to gas desorption before foaming. The nucleation in the PMMA/TPU increases as the saturation pressure increases. Regarding the effect ofthe foaming conditions, it is proved that it is necessary to have a fine controlto avoid degeneration of the cellular materials. Graded nanocellular polymerswith relative densities of 0.16–0.30 and cell sizes ranging 310–480 nm (in thenanocellular core) are obtained.
SN 1438-7492
YR 2019
FD 2019
LK http://uvadoc.uva.es/handle/10324/40705
UL http://uvadoc.uva.es/handle/10324/40705
LA spa
NO Macromol. Mater. Eng. 2020, 305, 1900428
DS UVaDOC
RD 24-nov-2024