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Article

Effect of the Molecular Structure of TPU on the Cellular Structure of Nanocellular Polymers Based on PMMA/TPU Blends

1
Cellular Materials Laboratory (CellMat), Condensed Matter Physics Department, University of Valladolid, Campus Miguel Delibes, Paseo de Belén n°7, 47011 Valladolid, Spain
2
CellMat Technologies S.L., Paseo de Belén 9-A, 47011 Valladolid, Spain
3
School of Materials, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
4
BioEcoUVA Research Institute on Bioeconomy, University of Valladolid, 47011 Valladolid, Spain
*
Author to whom correspondence should be addressed.
Academic Editors: Roberto De Santis, Judith Martín-de León and Victoria Bernardo
Polymers 2021, 13(18), 3055; https://doi.org/10.3390/polym13183055
Received: 14 July 2021 / Revised: 29 August 2021 / Accepted: 7 September 2021 / Published: 10 September 2021
(This article belongs to the Special Issue Sub-microcellular and Nanocellular Polymers)
In this work, the effects of thermoplastic polyurethane (TPU) chemistry and concentration on the cellular structure of nanocellular polymers based on poly(methyl-methacrylate) (PMMA) are presented. 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 have been 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, the density, hardness, and molecular weight of the TPU are higher. PMMA/TPU cellular materials show a gradient cell size distribution from the edge of the sample towards the nanocellular core. In the core region, the addition of TPU has a strong nucleating effect in PMMA. Core structure depends on the HS content and the TPU content. As the HS or TPU content increases, the cell nucleation density increases, and the cell size is reduced. Then, the use of TPUs with different characteristics allows controlling the cellular structure. Nanocellular polymers have been obtained with a core relative density between 0.15 and 0.20 and cell sizes between 220 and 640 nm. View Full-Text
Keywords: nanocellular polymer; poly(methyl-methacrylate); thermoplastic polyurethane; gas dissolution foaming nanocellular polymer; poly(methyl-methacrylate); thermoplastic polyurethane; gas dissolution foaming
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MDPI and ACS Style

Sánchez-Calderón, I.; Bernardo, V.; Santiago-Calvo, M.; Naji, H.; Saiani, A.; Rodríguez-Pérez, M.Á. Effect of the Molecular Structure of TPU on the Cellular Structure of Nanocellular Polymers Based on PMMA/TPU Blends. Polymers 2021, 13, 3055. https://doi.org/10.3390/polym13183055

AMA Style

Sánchez-Calderón I, Bernardo V, Santiago-Calvo M, Naji H, Saiani A, Rodríguez-Pérez MÁ. Effect of the Molecular Structure of TPU on the Cellular Structure of Nanocellular Polymers Based on PMMA/TPU Blends. Polymers. 2021; 13(18):3055. https://doi.org/10.3390/polym13183055

Chicago/Turabian Style

Sánchez-Calderón, Ismael, Victoria Bernardo, Mercedes Santiago-Calvo, Haneen Naji, Alberto Saiani, and Miguel Á. Rodríguez-Pérez 2021. "Effect of the Molecular Structure of TPU on the Cellular Structure of Nanocellular Polymers Based on PMMA/TPU Blends" Polymers 13, no. 18: 3055. https://doi.org/10.3390/polym13183055

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