Using Breath Figure Arrays as Template to Fabricate Microporous Honeycomb-like Polyurethane Films with Shape Memory Effect
Date Issued
2016
Date
2016
Author(s)
Lu, Chih-Sheng
Abstract
Micro-/nano structure of surface has a significant effect on wetting regimes. There are many different models to deal with surface wettibility through topography. This approach has been used to create superhydrophobic, or superoleophobic surfaces. Concerning active surface topography, some examples of patterned surfaces from shape memory materials, and the shape recovery of patterned structure has also been demonstrated. However, these surface patterns are made by replica molding, thermal embossing lithography or other dry processes, which cost more and are more complicated. In this research, by molecule design and process improvement, we designed a “buttom-up” method to pattern the surface of shape memory material. We took advantage of self-assembling of amphiphilic dendrons to pattern the shape memory polyurethane surface by modified direct breath figure(DBF) method, achieving microstructure on surface with shape memory behavior. Through this methodology, we can (1) simpilify the fabrication process and (2) achieve uniform surface microstructure and good mechenical properties simultaneously. Moreover, by the crosslinking reaction between azetidine-2,4-dione on the side-chain of pokyurethane and 1,6-diaminohexane, the mechanical properties and shape memory characteristics can be enhanced. Consequently, the change of wettibility by microstructure deformation is achieved by heating the material to the switching temperature.
Subjects
breath figure
shape memory
polyurethane
self-assembling
crosslinking
wettability
Type
thesis
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ntu-105-R03549026-1.pdf
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