Please use this identifier to cite or link to this item: http://dspace.mediu.edu.my:8181/xmlui/handle/123456789/4799
Title: Mechanical Properties and Adhesion of a Micro Structured Polymer Blend
Keywords: polymer blends
dewetting
mechanical properties
adhesion
AFM
Issue Date: 30-May-2013
Publisher: Molecular Diversity Preservation International
Description: A 50:50 blend of polystyrene (PS) and poly(n-butyl methacrylate) (PnBMA) has been characterized with an Atomic Force Microscope (AFM) in Tapping Mode and with force-distance curves. The polymer solution has been spin-coated on a glass slide. PnBMA builds a uniform film on the glass substrate with a thickness of @200 nm. On top of it, the PS builds an approximately 100 nm thick film. The PS-film undergoes dewetting, leading to the formation of holes surrounded by about 2 µm large rims. In those regions of the sample, where the distance between the holes is larger than about 4 µm, light depressions in the PS film can be observed. Topography, dissipated energy, adhesion, stiffness and elastic modulus have been measured on these three regions (PnBMA, PS in the rims and PS in the depressions). The two polymers can be distinguished in all images, since PnBMA has a higher adhesion and a smaller stiffness than PS, and hence a higher dissipated energy. Moreover, the polystyrene in the depressions shows a very high adhesion (approximately as high as PnBMA) and its stiffness is intermediate between that of PnBMA and that of PS in the rims. This is attributed to higher mobility of the PS chains in the depressions, which are precursors of new holes.
URI: http://koha.mediu.edu.my:8181/jspui/handle/123456789/4799
Other Identifiers: http://www.mdpi.com/2073-4360/3/3/1091/
http://www.doaj.org/doaj?func=openurl&genre=article&issn=20734360&date=2011&volume=3&issue=3&spage=1091
Appears in Collections:Science General

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