Voss, Agnieszka and Stark, Robert W. and Dietz, Christian (2014):
Surface versus Volume Properties on the Nanoscale: Elastomeric Polypropylene.
In: Macromolecules, AMER CHEMICAL SOC, WASHINGTON, DC, USA, pp. 5236-5245, 47, (15), ISSN 0024-9297, [Online-Edition: http://dx.doi.org/10.1021/ma500578e],
[Article]
Abstract
The difference between the mechanical properties of a material at the surface and in the bulk is an open issue in polymer science. We studied the mechanical surface properties of polypropylene using atomic force microscopy in peak-force tapping mode. The bulk properties were obtained from layer-by-layer measurements of elasticity, adhesion, and dissipation, with the successive layers removed via wet-chemical ablation. The original sample surface revealed nearly similar mechanical properties for the amorphous and crystalline regions due to a thin (similar to 22 nm) amorphous top layer. However, in the bulk material, the elastic modulus of crystalline regions was greater than that of amorphous regions. We observed nanoscale crystalline inhomogeneities caused by phase separation that can affect the mechanical stability of polypropylene on the macroscopic scale. The combination of force-volume analysis together with successive ablation of the sample layers form the basis of quantitative nanomechanical tomography.
| Item Type: | Article |
|---|---|
| Erschienen: | 2014 |
| Creators: | Voss, Agnieszka and Stark, Robert W. and Dietz, Christian |
| Title: | Surface versus Volume Properties on the Nanoscale: Elastomeric Polypropylene |
| Language: | English |
| Abstract: | The difference between the mechanical properties of a material at the surface and in the bulk is an open issue in polymer science. We studied the mechanical surface properties of polypropylene using atomic force microscopy in peak-force tapping mode. The bulk properties were obtained from layer-by-layer measurements of elasticity, adhesion, and dissipation, with the successive layers removed via wet-chemical ablation. The original sample surface revealed nearly similar mechanical properties for the amorphous and crystalline regions due to a thin (similar to 22 nm) amorphous top layer. However, in the bulk material, the elastic modulus of crystalline regions was greater than that of amorphous regions. We observed nanoscale crystalline inhomogeneities caused by phase separation that can affect the mechanical stability of polypropylene on the macroscopic scale. The combination of force-volume analysis together with successive ablation of the sample layers form the basis of quantitative nanomechanical tomography. |
| Journal or Publication Title: | Macromolecules |
| Volume: | 47 |
| Number: | 15 |
| Publisher: | AMER CHEMICAL SOC, WASHINGTON, DC, USA |
| Divisions: | 11 Department of Materials and Earth Sciences > Material Science > Physics of Surfaces Exzellenzinitiative > Clusters of Excellence > Center of Smart Interfaces (CSI) 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences Zentrale Einrichtungen Exzellenzinitiative Exzellenzinitiative > Clusters of Excellence |
| Date Deposited: | 08 Jun 2016 09:08 |
| Official URL: | http://dx.doi.org/10.1021/ma500578e |
| Identification Number: | doi:10.1021/ma500578e |
| Funders: | We thank the Center of Smart Interface for financial support. |
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