RT info:eu-repo/semantics/article
T1 Highly anisotropic nanocellular polymers based on tri-phasic blends of PMMA with two nucleating agents
A1 Bernardo García, Victoria
A1 Martín de León, Judit
A1 Rodríguez Pérez, Miguel Ángel
AB 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.
SN 0167-577X
YR 2019
FD 2019
LK http://uvadoc.uva.es/handle/10324/40706
UL http://uvadoc.uva.es/handle/10324/40706
LA spa
NO Material Letters 225 (2019) 126587
DS UVaDOC
RD 24-nov-2024