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Fabrication of Micro-Structures on Polymer Surfaces Via Physical Pressing Methods

Author: Wang
Tutor: GaoChangYou
School: Zhejiang University
Course: Materials Science and Engineering
Keywords: Microstructures Surface patterning Physical imprint Polyelectrolyte multilayers Colloidal crystals
CLC: O631.3
Type: Master's thesis
Year: 2006
Downloads: 121
Quote: 1
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Abstract


This paper uses the polyelectrolyte multilayers compression and thermocompression constructed by two methods of polymer micro-structure. Use with the electrostatic interaction between the opposite charge polyelectrolyte build a polymer ultra thin film by alternately depositing, on the solid surface. The film can be silicone rubber soft seal patterned compression. Compression depth from a few nanometers to several hundred nanometers, is proportional to the original film thickness. Compression performance is directly related to the drying process, the study found that water molecules within the multilayer film have a significant impact on its micro-structure and properties. Compressed many of the properties of the multilayer film, such as permeability, surface wettability and surface roughness have undergone a change. After compression, the diffusion coefficient of the fluorescent probe in the multilayer film is significantly reduced, and the loss of sensitivity to the environmental ionic strength. The analysis showed that the compression caused by the pore density of the interior of the film and the decline of the free volume fraction. Thus, compression is caused by an applied pressure of the glass transition behavior. Compressing the membrane can cause static electricity, the enhancement of the hydrophobic interaction, thus providing extra freedom to make the multilayer film is more stable. Chemical homogeneous, physically heterogeneous microstructure patterned compression can be built in the polymer surface. Further use of the compressed area and uncompressed area in response to external stimuli, prepared by a local porous, such as morphology of the surface of the complex topologies. Hot pressing technique at the same time build a physical - chemical co pattern in the polymer surface. Dip multiple molecular soft seal can be pressed into the surface of the polymer in a viscous flow state, thereby copying the physical structure while efficiently implement the transfer of dip molecular layer. The type of the pattern can easily be regulated by the dip coating solution concentration, dipping time, and the molecular structure. Since the diffusion of the molecular layer of the surface-modified into the polymeric substrate, so that the modified layer has a good stability. The cell responsiveness studies have shown that cells can be hung on the modification of the resistance above the recessed area of ??the sticky substance. Colloidal crystals into the hot pressing technique, the wavy undulation having a large size and small-scale porous structure of the complex topology morphology. Serum protein adsorption and cell culture experiments showed that the infiltration of the liquid in the surface is limited. Difficulties can be learned by the model calculations, liquid penetrant diffusion porous structure internal residual

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Polymer physics and physical chemistry of polymers > The chemical nature of polymers
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