2026-05-05T10:17:52Zhttps://uvadoc.uva.es/oai/requestoai:uvadoc.uva.es:10324/407062021-06-24T07:47:05Zcom_10324_31661com_10324_952com_10324_894com_10324_1158com_10324_931col_10324_31662col_10324_1242
UVaDOC
author
Bernardo García, Victoria
author
Martín de León, Judit
author
Rodríguez Pérez, Miguel Ángel
2020-04-06T07:35:42Z
2020-04-06T07:35:42Z
2019
Material Letters 225 (2019) 126587
0167-577X
http://uvadoc.uva.es/handle/10324/40706
10.1016/j.matlet.2019.126587
126587
Materials Letters
255
One strategy to produce nanocellular polymers is the use of nucleating species to promote nucleation. Whereas two-phase systems are widely studied, tri-phasic blends with two nucleating agents are uncommonly investigated. In this work, nanocellular polymers are obtained using tri-phasic blends of polymethylmethacrylate (PMMA) with two nucleating agents: needle-like sepiolites and a polymethylmethacrylate-polybutylacrylate-polymethylmethacrylate (MAM) block copolymer. Blends of PMMA with different concentrations of MAM and a fixed amount of sepiolites are produced by extrusion. Results show that at low MAM contents (1 wt%), the nucleation is a combination of the action of the two additives, but the addition of sepiolites induces the appearance of anisotropic structures. Meanwhile, at high MAM concentrations (10 wt%), MAM nanostructuration controls the nucleation and sepiolites increase the anisotropy. The alignment of the MAM micelles and the sepiolites in the extrusion direction promotes coalescence in this direction, leading to highly anisotropic nanocellular structures. Mean cell sizes of 100–300 nm and an average anisotropy ratio of 2.77 are obtained thanks to the combined effect of MAM and sepiolites.
spa
Highly anisotropic nanocellular polymers based on tri-phasic blends of PMMA with two nucleating agents
info:eu-repo/semantics/article
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URL
https://uvadoc.uva.es/bitstream/10324/40706/1/Material%20Letters%202019.pdf
File
MD5
ed21612ad784169473ff022482b425e8
2805400
application/pdf
Material Letters 2019.pdf