RT info:eu-repo/semantics/article
T1 Key Production Parameters to Obtain Transparent Nanocellular PMMA
A1 Martín de León, Judit
A1 Bernardo García, Victoria
A1 Rodríguez Pérez, Miguel Ángel
AB Transparent nanocellular polymethylmethacrylate (PMMA) with relative density around 0.4 is produced for the first time by using the gas dissolution foaming technique. The processing conditions and the typical characteristics of the cellular structure needed to manufacture this novel material are discovered. It is proved that low saturation temperatures (−32 °C) combined with high saturation pressures (6, 10, 20 MPa) allow increasing the solubility of PMMA up to values not reached before. In particular, the highest CO2 uptake ever reported for PMMA, (i.e., 48 wt%) is found for a saturation pressure of 20 MPa and a saturation temperature of −32 °C. Due to these processing conditions, cell nucleation densities of 1016 nuclei cm−3 and cell sizes clearly below 50 nm are achieved. The nanocellular polymers obtained, with cell sizes ten times smaller than the wavelength of visible light and very homogeneous cellular structures, show a significant transparency.
SN 1438-7492
YR 2017
FD 2017
LK http://uvadoc.uva.es/handle/10324/40720
UL http://uvadoc.uva.es/handle/10324/40720
LA spa
NO acromolecular Materials and EngineeringVolume 302, Issue 12
DS UVaDOC
RD 22-nov-2024