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Surface versus Volume Properties on the Nanoscale: Elastomeric Polypropylene

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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