Influences of poly[(styrene)x-stat-(chloromethylstyrene)y]s additives on dewetting behaviors of polystyrene thin films: effects of polar group ratio and film thickness

Thermal Dewetting Behavior of Polystyrene Composite Thin Films with Organic-Modified Inorganic Nanoparticles

“…In the figures, the contact angles of water on the substrate are also shown to comprehend the relationship between the surface energy and surface hydrophobicity of the silanized substrate used for determination of surface energy. The surface energies of SiO 2 and octadecane, which are the surface compositions of the unsilanized substrate with contact angle of approximately 30° and fully silanized substrate with contact angle of 100°, are 62.1 and 28.3 mJ/m 2 , respectively, and thus the estimated values of surface energy in this study are appropriate. The open plots shown in Figure denote the relationship between the surface energy and the degree of dewetting in each of the 3 × 3 regions of the substrate surface, and the solid plots denote the mean value of them.…”

Enhancing the stability of polystyrene ultrathin films by using star-shape polymers as dewetting inhibitors

“…Surface energies of PS, three-arm PS, and SiO x /Si were measured following the Owens-Wendt-Kaelble approach, described in our previous reports. 15,36,37 Water and diiodomethane were used as solvents. Static contact angles of the solvent droplets on each surface were measured by using a goniometer (CAM-PLUS Tantec, U.S. Patent, USA).…”

“…15 The use of the same additives may lead to opposite results, depending on The degree of chain entanglement, on the other hand, diminishes upon decreasing the film thickness. 40 In relatively thick film, the effect of chain entanglement and other types of interchain interactions becomes a dominant factor.…”

“…By modifying the interfacial tension between film and substrate, the stability of polymeric thin film is improved. [8][9][10][11][12][13][14][15][16][17][18][19][20] For example, the substrate surface is modified by chemical compositions with high affinity to the polymer film. 10 Thus, the interfacial tension between film and substrate is attuned, which improves the stability of polymeric thin film.…”

“…[11][12][13][14][15][16]18,19,21 Therefore, the addition of functionalized polymers such as sulfonated polystyrene with a sulfonation level of 0.76-6.5 mol% or poly(styrene-stat-chloromethylstyrene) with 5 mol% of chloromethylstyrene group into polystyrene (PS) thin film can enhance interfacial interactions, which in turn retard the dewetting process. 12,13,15,16 A fascinating strategy to suppress the dewetting of polymeric thin films is also presented by Barnes et al 22 The addition of small amounts of fullerene nanoparticles into PS and polybutadiene thin films results in significant enhancement of their stability. In recent years, many researchers have investigated the mechanism of this phenomenon and have discovered that other nanoparticles can also be used as dewetting inhibitors.…”