Growth of Noncircular and Faceted Holes in Liquid–Liquid Dewetting of Thin Polymer Bilayers

2011 ◽  
Vol 44 (23) ◽  
pp. 9335-9340 ◽  
Author(s):  
Lin Xu ◽  
Ashutosh Sharma ◽  
Sang W. Joo
Keyword(s):  
Thin Polymer ◽  
Polymer Bilayers

Quantitative Thickness Mapping of Dewetting Polymer Bilayers

1998 ◽  
Vol 4 (S2) ◽  
pp. 828-829
Author(s):  
D. A. Winesett ◽  
H. Ade ◽  
A. P. Smith ◽  
M. Rafailovich ◽  
S. Sokolov ◽  
...  
Keyword(s):  
Polymer Films ◽  
Dielectric Films ◽  
Thin Polymer Films ◽  
X Ray ◽  
Paint Systems ◽  
Novel Approach ◽  
Thin Polymer ◽  
Scanning Transmission ◽  
Polymer Bilayers ◽  
Brominated Polystyrene

The study of wetting and dewetting in thin polymer films has many implications for technological applications of polymer films, including dielectric films to control conductivity and colloidal paint systems. We have started to use a novel approach, Near Edge X-ray Absorption Fine Structure (NEXAFS) microscopy, to characterize dewetting in thin polymer films. We have investigated a polystyrene/brominated polystyrene (PS/PBrS) bilayer model system with the Scanning Transmission X-ray Microscope (STXM) at the National Synchrotron Light Source. Our method offers quantitative thickness mapping of all constituent components in these thin polymer films.NEXAFS imaging of polymers has advantages over other forms of microscopy primarily because of its low damage, good chemical sensitivity, and the possibility for quantitative analysis. Figure 1 shows four micrographs of one PS/PBrS bilayer annealed for one week at 170 C.

Confinement induced ordering in dewetting of ultra-thin polymer bilayers on nanopatterned substrates

Nanoscale ◽  
2016 ◽  
Vol 8 (2) ◽  
pp. 1073-1087 ◽  
Author(s):  
Nandini Bhandaru ◽  
Anuja Das ◽  
Rabibrata Mukherjee
Keyword(s):  
Square Lattice ◽  
Thin Polymer ◽  
Polymer Bilayers

We report the dewetting of a thin bilayer of polystyrene (PS) and poly(methylmethacrylate) (PMMA) on a topographically patterned nonwettable substrate comprising an array of pillars, arranged in a square lattice.

Dewetting kinetics of thin polymer bilayers: Role of under layer

Polymer ◽  
2011 ◽  
Vol 52 (19) ◽  
pp. 4345-4354 ◽  
Author(s):  
Lin Xu ◽  
Dipankar Bandyopadhyay ◽  
Tongfei Shi ◽  
Lijia An ◽  
Ashutosh Sharma ◽  
...  
Keyword(s):  
Thin Polymer ◽  
Polymer Bilayers ◽  
Kinetics Of

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.

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.

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