Rubber-Assisted Hot Embossing for Structuring Thin Polymer Film Polymeric Films

2006 ◽  
Author(s):  
Pratapkumar Nagarajan ◽  
Donggang Yao
Keyword(s):  
Thin Films ◽  
Film Thickness ◽  
Polymer Film ◽  
Hot Embossing ◽  
Polymeric Films ◽  
Thin Polymer Film ◽  
Thin Polymer Films ◽  
Process Variables ◽  
Hard Materials ◽  
Thin Polymer

Precision structured polymer thin films with microstructures comparable to or greater than the film thickness are highly desired in many applications. Such micro-patterned thin films, however, are difficult to fabricate using the standard hot embossing technology where both halves of the mold are made of hard materials. This study investigated a rubber-assisted embossing process for structuring thin polymer films. The advantages of the rubber backup instead of a hard support include but are not limited to 1) simplifying the embossing tool, 2) protecting the embossing master, 3) facilitating embossing pressure buildup, and 4) accommodating conformal forming of microscale shell patterns. Several design and process variables including rubber hardness, embossing temperature, embossing pressure and holding time were carefully studied. Thin polystyrene films in a thickness of 25 μm were accurately patterned with microgrooves of characteristic dimensions on the order of 100 μm.

Effect of Thin Film Confinement on the Transport Properties of Ultra-Thin Polymer Films

2003 ◽  
Vol 790 ◽  
Author(s):  
Lovejeet Singh ◽  
Peter J. Ludovice ◽  
Clifford L. Henderson
Keyword(s):  
Molecular Weight ◽  
Diffusion Coefficient ◽  
Film Thickness ◽  
Critical Thickness ◽  
Thin Polymer Film ◽  
Vapor Sorption ◽  
Thin Polymer Films ◽  
Polymer Molecular Weight ◽  
Strong Function ◽  
Thin Polymer

ABSTRACTThe influence of film thickness and polymer molecular weight on the diffusion coefficient of a series of small molecule penetrants (including water, benzene, and trifluoroacetic acid) in thin films of two different model photoresist polymers (poly(p-hydroxystyrene) and bis-triflouromethyl carbinol substituted poly(norbornene)) has been studied using vapor sorption experiments via quartz crystal microbalance (QCM) methods. Diffusion coefficients for films ranging in thickness from approximately 1 μm to 50 nm were determined. It is observed that the diffusion coefficient of small molecules in a thin polymer film is a strong function of film thickness, and that the diffusion coefficient decreases drastically as film thickness is reduced below a critical thickness value. This critical thickness value is found to be a function of both the type of polymer used and the polymer molecular weight.

scholarly journals Infrared Absorption Gauge for On-Line Measurement of Thin Polymer Film Thickness

1998 ◽  
Vol 34 (10) ◽  
pp. 1289-1295
Author(s):  
Katsue KOASHI ◽  
Shuusaku SHIGETA ◽  
Hiroshi YOKOTA ◽  
Masaaki KIMURA
Keyword(s):  
Film Thickness ◽  
Polymer Film ◽  
Infrared Absorption ◽  
Thin Polymer Film ◽  
Line Measurement ◽  
Thin Polymer ◽  
On Line

Surface Modification of Poly (alkyl/Arylphosphazene) Thin Films

2000 ◽  
Vol 629 ◽  
Author(s):  
John V. St. John ◽  
Patty Wisian-Neilson
Keyword(s):  
Thin Films ◽  
Surface Modification ◽  
Chemical Resistance ◽  
Chemical Properties ◽  
Inorganic Polymers ◽  
Thin Polymer Films ◽  
Hydrophilic Interactions ◽  
Carboxylic Acid Groups ◽  
Polymer Interface ◽  
Thin Polymer

ABSTRACTPoly (methylphenylphosphazene) (PMPP) is an example of a unique class of inorganic polymers with alternating – (P=N)– backbones. Chemical modification of bulk PMPP can result in changes of physical properties such as chemical resistance, onset temperature of thermal degradation, elasticity, and flexibility. Surface modification of PMPP allows tailoring of the chemical properties at the polymer interface while maintaining the integrity of the bulk polymer. In this research, PMPP thin films were treated to form carboxylate or carboxylic acid groups at the surface. Surface modification was monitored by following changes in contact angle. The hydrophobic/hydrophilic interactions of carboxylated PMPP surfaces allow for mesoscale interactions of thin polymer films.

Exploiting cellular convection in a thick liquid layer to pattern a thin polymer film

2016 ◽  
Vol 108 (5) ◽  
pp. 051604 ◽  
Author(s):  
Iman Nejati ◽  
Mathias Dietzel ◽  
Steffen Hardt
Keyword(s):  
Polymer Film ◽  
Liquid Layer ◽  
Thin Polymer Film ◽  
Thin Polymer

Finite Thickness Influence on Spherical and Conical Indentation on Viscoelastic Thin Polymer Film

2005 ◽  
Vol 127 (1) ◽  
pp. 33-37 ◽  
Author(s):  
V. Gonda ◽  
J. den Toonder ◽  
J. Beijer ◽  
G. Q. Zhang ◽  
L. J. Ernst
Keyword(s):  
Polymer Film ◽  
Material Properties ◽  
Finite Thickness ◽  
Thin Polymer Film ◽  
Spherical Indentation ◽  
Infinite Plane ◽  
Precise Knowledge ◽  
Thin Polymer ◽  
Measurement Results ◽  
Conical Indentation

The thermo-mechanical integration of polymer films requires a precise knowledge of material properties. Nanoindentation is a widely used testing method for the determination of material properties of thin films such as Young’s modulus and the hardness. An important assumption in the analysis of the indentation is that the indented medium is a semi-infinite plane or half space, i.e., it has an “infinite thickness.” In nanoindentation the analyzed material is often a thin film that is deposited on a substrate. If the modulus ratio is small, (soft film on hard substrate) and the penetration depth is small too, then the Hertzian assumption does not hold. We investigate this situation with spherical and conical indentation. Measurement results are shown using spherical indentation on a visco-elastic thin polymer film and a full visco-elastic characterization is presented.

scholarly journals Functional patterned coatings by thin polymer film dewetting

2017 ◽  
Vol 507 ◽  
pp. 453-469 ◽  
Author(s):  
Andrew M. Telford ◽  
Stuart C. Thickett ◽  
Chiara Neto
Keyword(s):  
Polymer Film ◽  
Thin Polymer Film ◽  
Thin Polymer

scholarly journals Self-Assembly of Octapod-Shaped Colloidal Nanocrystals into a Hexagonal Ballerina Network Embedded in a Thin Polymer Film

Nano Letters ◽  
2014 ◽  
Vol 14 (2) ◽  
pp. 1056-1063 ◽  
Author(s):  
Milena P. Arciniegas ◽  
Mee R. Kim ◽  
Joost De Graaf ◽  
Rosaria Brescia ◽  
Sergio Marras ◽  
...  
Keyword(s):  
Polymer Film ◽  
Self Assembly ◽  
Colloidal Nanocrystals ◽  
Thin Polymer Film ◽  
Thin Polymer
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