期刊
MACROMOLECULAR MATERIALS AND ENGINEERING
卷 305, 期 1, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/mame.201900428
关键词
gas dissolution foaming; graded structures; nanocellular polymers; nanostructuration
资金
- Ministerio de Economia y Competitividad, FEDER, UE [MAT2015-69234-R]
- Junta de Castile and Leon [VA275P18]
- FPU grant from the Ministerio de Educacion, Cultura y Deporte [FPU14/02050]
- EREN (Ente Regional de la Energia de Castilla y Leon) [EREN_2019_L4_UVA]
Graded structures and nanocellular polymers are two examples of advanced cellular morphologies. In this work, a methodology to obtain low-density graded nanocellular polymers based on poly(methyl methacrylate) (PMMA)/thermoplastic polyurethane (TPU) blends produced by gas dissolution foaming is reported. A systematic study of the effect of the processing condition is presented. Results show that the melt-blending results in a solid nanostructured 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 nucleating sites, enhancing nucleation compared to pure PMMA and allowing the change from a microcellular to a nanocellular structure. Nonetheless, the outer 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 the samples due to gas desorption before foaming. The nucleation in the PMMA/TPU increases as the saturation pressure increases. Regarding the effect of the foaming conditions, it is proved that it is necessary to have a fine control to avoid degeneration of the cellular materials. Graded nanocellular polymers with relative densities of 0.16-0.30 and cell sizes ranging 310-480 nm (in the nanocellular core) are obtained.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据