The Effect of Short and Long Range Interactions on Break up and Dewetting of Thin Polymer Films

1991 ◽  
Vol 248 ◽  
Author(s):  
Gtonter Reiter
Keyword(s):  
Average Distance ◽  
Substrate Surface ◽  
Liquid Films ◽  
Recent Theory ◽  
Thin Polymer Films ◽  
Dewetting Process ◽  
Thin Polymer ◽  
Long Range Interactions ◽  
Cylindrical Holes ◽  
Break Up

AbstractWe report investigations of instabilities of thin polystyrene films (< 100 nm). In the liquid state films break up by creating cylindrical holes. The average distance between holes is approx. proportional to the film thickness squared. This dependence compares well with the prediction of a recent theory on spinodal decomposition of thin liquid films. The subsequent dewetting process (=growth of holes) depends strongly on the composition of the substrate surface whereas the break up does not seem to be influenced by this surface. The importance of long and short range interactions in this context is discussed.

Pattern Formation in Thin Polymer Films: A New Morphology

2000 ◽  
Vol 629 ◽  
Author(s):  
Jean-Loup Masson ◽  
Peter F. Green
Keyword(s):  
Growth Rate ◽  
Pattern Formation ◽  
Early Stage ◽  
Structural Evolution ◽  
Distinct Form ◽  
Thin Polymer Films ◽  
Intermediate Morphology ◽  
Thin Polymer ◽  
Nonwetting Liquid ◽  
Cylindrical Holes

ABSTRACTResearchers have shown that thin, nonwetting, liquid homopolymer films dewet substrates, forming patterns that reflect fluctuations in the local film thickness. These patterns have been shown to be either discrete cylindrical holes or bicontinuous “spinodal-like” patterns. In this paper we show the existence of a new morphology. During the early stage of dewetting, discrete highly asymmetric holes appear spontaneously throughout the film. The nucleation rate of these holes is faster than their growth rate. The morphology of the late stage of evolution, after 18 days, is characterized by a bicontinuous pattern, distinct form conventional spinodal dewetting patterns. This morphology has been observed for a range of film thicknesses between 7.5 and 21nm. The structural evolution of this intermediate morphology is discussed.

scholarly journals Nucleated dewetting in supported ultra-thin liquid films with hydrodynamic slip

Soft Matter ◽  
2017 ◽  
Vol 13 (27) ◽  
pp. 4756-4760 ◽  
Author(s):  
Matthias Lessel ◽  
Joshua D. McGraw ◽  
Oliver Bäumchen ◽  
Karin Jacobs
Keyword(s):  
Boundary Condition ◽  
Surface Energy ◽  
Liquid Films ◽  
Thin Liquid Films ◽  
Thin Polymer Films ◽  
Breakup Mechanism ◽  
Thin Polymer ◽  
Hydrodynamic Slip ◽  
Liquid Boundary ◽  
Solid Liquid

This study reveals the influence of the surface energy and solid/liquid boundary condition on the breakup mechanism of dewetting ultra-thin polymer films.

Room Temperature Dewetting of Polymer Thin Films Investigated by AFM and Low Voltage SEM

2000 ◽  
Vol 6 (S2) ◽  
pp. 710-711
Author(s):  
D.N. Leonard ◽  
A.D. Batchelor ◽  
R.J. Spontak ◽  
P.E. Russell
Keyword(s):  
Thin Films ◽  
Biomedical Applications ◽  
Diblock Copolymers ◽  
Low Voltage ◽  
Nucleation Site ◽  
Thin Polymer Films ◽  
Dewetting Process ◽  
Thin Polymer ◽  
Dry Patch ◽  
Free Films

Thin films (<100nm) of diblock copolymers are being investigated for various applications including templates for nanopatterning [1], electronic packaging materials, and biomedical applications. In such applications it is essential that stable defect free films be produced repeatedly. Because long and short range forces (like van der Waals) dominate thin polymer films, instabilities are introduced in the films when they are spin-coated onto hydrophobic substrates resulting in dewetting of the film from the substrate. Dewetting is initiated at a nucleation site in a metastable film leading to the formation of a dry patch and proceeds to grow by transport of material away from the nucleation site, forming a lip that surrounds the hole. Highly symmetrical structures form during progression of the dewetting process and completion of the process can be identified when all holes coalesce forming polygons outlined by droplets of the polymer film [2].

scholarly journals Investigation of Roughness Correlation in Polymer Brushes via X-ray Scattering

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2101
Author(s):  
Marcus Hildebrandt ◽  
Eui-young Shin ◽  
Suan Yang ◽  
Wael Ali ◽  
Sedakat Altinpinar ◽  
...  
Keyword(s):  
Polymer Films ◽  
Polymer Brushes ◽  
Substrate Surface ◽  
Polymer Surface ◽  
Intrinsic Property ◽  
Polymer Chains ◽  
Thin Polymer Films ◽  
Solvent Vapor ◽  
X Ray Scattering ◽  
Thin Polymer

Thin polymer films and coatings are used to tailor the properties of surfaces in various applications such as protection against corrosion, biochemical functionalities or electronic resistors. Polymer brushes are a certain kind of thin polymer films, where polymer chains are covalently grafted to a substrate and straighten up to form a brush structure. Here we report on differences and similarities between polymer brushes and spin-coated polymer films from polystyrene and polymethyl methacrylate with special emphasis on surface roughness and roughness correlation. The phenomenon of roughness correlation or conformality describes the replication of the roughness profile from the substrate surface to the polymer surface. It is of high interest for polymer physics of brush layers as well as applications, in which a homogeneous polymer layer thickness is required. We demonstrate that spin-coated films as well as polymer brushes show roughness correlation, but in contrast to spin-coated films, the correlation in brushes is stable to solvent vapor annealing. Roughness correlation is therefore an intrinsic property of polymer brushes.

Is the chain dynamics in thin polymer films isotropic ?

2000 ◽  
Vol 10 (PR7) ◽  
pp. Pr7-233-Pr7-237 ◽  
Author(s):  
S. Rivillon ◽  
P. Auroy ◽  
B. Deloche
Keyword(s):  
Polymer Films ◽  
Thin Polymer Films ◽  
Chain Dynamics ◽  
Thin Polymer

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.

Reducing the сontact angle hysteresis of thin polymer films by oil impregnation in supercritical carbon dioxide

2021 ◽  
Vol 154 ◽  
pp. 106202
Author(s):  
Polina S. Kazaryan ◽  
Maria A. Agalakova ◽  
Elena P. Kharitonova ◽  
Marat O. Gallyamov ◽  
Mikhail S. Kondratenko
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Polymer Films ◽  
Thin Polymer Films ◽  
Thin Polymer ◽  
Oil Impregnation ◽  
Supercritical Carbon
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