Evaluation of surface free energy for PMMA films

Abstract

Surface free energy (SFE) is a property resulted from the chemical structure and the orientation of the molecules at the surface boundary of the materials. For solids, it can be calculated from the contact angles of liquid drops with known surface tension, formed on the solid surface. There are various SFE evaluation methods based on different theoretical assumptions. In this study, SFE and the dispersive, polar, acidic and basic components of the SFE of a polymeric material, poly(methyl methacrylate) (PMMA), were calculated by using Zisman, Saito, Fowkes, Berthelot, Geometric mean, Harmonic mean, and Acid-base approaches. The results obtained from various liquid couples or triplets were compared.

Error estimates for density-functional theory predictions of surface energy and work function

“…The experimental challenge is underlined by the myriad of different methods that have been proposed to determine the surface energy. These vary from cleavage experiments [24] for brittle materials, the zero-creep method for more ductile materials [30,31], the analysis of the equilibrium shape of crystallites [22,23], or contact angle measurements of liquid droplets [32]; to less direct solutions such as measuring the elastic modulus [33], the electrical conductivity [34], or even the speed of acoustic waves [35] in submicrometer powder assemblies. These experiments often suffer from a low precision and inaccuracies due to surface contaminants, but more importantly from a benchmark point of view, each method is biased towards a certain class of materials.…”

Investigations on laser printing of microcapacitors using poly (methyl methacrylate) dielectric thin films for organic electronics applications

“…It exhibits high resistivity (> 2·10 15 Ω·cm) and low dielectric constant (ε = 2.6 at 1 MHz, ε = 3.9 at 60 Hz), good dielectric strength (17.7 -60 kV/mm), and a low dissipation factor (0.013 -0.015). The surface tension of PMMA is ~39 mJ/m² at 25 °C [26][27][28], an important aspect for understanding interfacial phenomena. In multilayered structures, PMMA films can be made by spin coating, but also by pulsed laser deposition and matrix-assisted pulsed laser evaporation [29][30][31], depending on the final structures that are intended to be grown.…”

Protein adsorption and cell adhesion controlled by the surface chemistry of binary perfluoroalkyl/oligo(ethylene glycol) self-assembled monolayers

“…Deionized water and methylene iodide were used as test liquids and the surface energies were derived by using the Young-GoodGirifalco-Fowkes equation [24]. Grazing angle infrared spectra (GIR) were acquired using a Tensor 27 FTIR spectrometer equipped with a microscope Hyperion 2000 with grazing angle objective (Bruker Optics) and a liquid nitrogen cooled MCT detector.…”