Micro-to-nano scale filling behavior of PMMA during imprinting
Autor: | Ziyang Liu, Hao Zhang, Xia Li, Jingmin Li, Liang Chao, Chong Liu, Fan Jinguang |
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Rok vydání: | 2017 |
Předmět: |
Materials science
Science Modulus 02 engineering and technology macromolecular substances 010402 general chemistry 01 natural sciences Article chemistry.chemical_compound Composite material Methyl methacrylate Nanoscopic scale Softening Melt flow index chemistry.chemical_classification Multidisciplinary Shear thinning technology industry and agriculture Polymer 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Hardening (metallurgy) Medicine 0210 nano-technology |
Zdroj: | Scientific Reports Scientific Reports, Vol 7, Iss 1, Pp 1-8 (2017) |
ISSN: | 2045-2322 |
Popis: | The filling behavior of polymers in narrow gaps or small pores is important for the dynamics of polymeric micro/nanostructure fabrication. Here, the filling behavior, the mechanical properties, and the stress versus strain relationship of 996 kD poly (methyl methacrylate) (PMMA) at a scale from micron to molecular confinement are measured. It has been found that the solid polymer exhibits elastic-plastic dominant deformation behavior at micron scale. As the scale reduces to submicron, the resistance to deformation of the polymeric solid has a pronounced reduction. A softening effect and the visco-dominant behavior which is always exhibited by melt flow is observed. In confinement conditions, an anomalous hardening effect is found. The modulus and the hardness of 996 kD PMMA have been found to increase dramatically. The stress-strain curve also exhibits an obvious hardening phenomenon which is contrary to the conventional shear thinning and deformation acceleration results. The results of this paper show that the PMMA can exhibit a change of “solid-fluid-solid” in mechanical character at micron to molecular confinement scale. |
Databáze: | OpenAIRE |
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