Capstone® FS-30

• CAS: 1640092-35-8
• Catalog Number: ACM1640092358
• Category: Main Products
• Density: 1.1 g/mL at 25 °C
• Appearance: Liquid

Case Study

Interactions between surfactants like Capstone® FS-30 and polysaccharides

Grządka, E., Jakub Matusiak, and Marek Stankevič. Journal of Molecular Liquids 283 (2019): 81-90.

The interactions between a mixture of fluorosurfactants (FS) of different chemical nature (anionic - Capstone FS-64, cationic - S-106A and nonionic - Capstone® FS-30) and polysaccharides (anionic - carboxymethylcellulose (CMC), cationic starch (CS) and nonionic hydroxyethylcellulose (HEC)) have been studied by means of surface tension, viscosity and nuclear magnetic resonance (NMR). The factors controlling the formation of polysaccharide-surfactant complexes (PSCs) are discussed from the perspective of electrostatic and hydrophobic interactions. Surface tension and viscosity measurements allow to find out in which systems the interactions occur and when they start and end. NMR studies allow not only to analyze the chemical structure of fluorosurfactants but also to determine the characteristics of PSCs.
The surface tension of surfactants (Capstone FS-64, S-106A and Capstone® FS-30) in the presence and absence of CMC, HEC and CS were determined using the hanging drop method to estimate the critical micelle and critical association concentrations. Pendant drop tests were performed using a CAM Theta goniometer. The analysis is based on fitting the full equation to the drop profile of the pendant drop (surface tension) derived from the Young-Laplace equation.

Capstone® FS-30Water-based Conductive Ink for Preparing High-Efficiency EMI Shielding Coatings

Jia, Li-Chuan, et al. Chemical Engineering Journal 384 (2020): 123368.

Conductive inks are widely used in electromagnetic interference (EMI) shielding coatings, but the large-scale use of organic solvents may cause safety issues and environmental pollution. There is a method for preparing an environmentally friendly conductive ink composed of silver flakes, water-based polyurethane and fluorocarbon surfactant (Capstone® FS-30) with deionized water as a solvent. The conductive ink can be easily dropped on polyethylene terephthalate film to form a highly efficient EMI shielding coating, which can achieve an ultra-high EMI shielding effectiveness (EMI SE) of 74.5 dB at only 10 μm thickness. The shielding coating is flexible enough to ensure up to 96% EMI SE retention even after 5000 bend-release cycles (bending radius of 2 mm), which shows excellent EMI shielding reliability. The shielding coating also has mechanical fastness under ultrasonic treatment and chemical durability to various organic solvents.
The preparation of Ag/WPU coating includes the following steps. Ag flakes (3 g) were first dispersed in deionized water (10 mL) with the help of Capstone® FS-30 (1 g), and then mixed by a vortex mixer (2500 rpm) for 30 min to form a uniform Ag flake dispersion. Capstone FS-30 is a nonionic and water-soluble fluorosurfactant that can reduce the surface tension of water and achieve wettability of Ag flakes in water. WPU and waterborne polycarbodiimide were added to the Ag dispersion step by step and stirred for 30 min to obtain Ag/WPU ink. The addition amounts of WPU were 2.5, 4.3, 6.7, 10.0, and 15.0 g, respectively, and the mass ratio of waterborne polycarbodiimide to WPU was 5:100. The prepared Ag/WPU ink was a fully water-based coating system with environmental protection. The Ag/WPU ink was drop-coated on a hot PET film (80°C) and dried at 80°C for 30 min to form an Ag/WPU coating. WPU has high adhesion and good film-forming properties, and can be used as a polymer binder to provide fastness and softness to the Ag/WPU coating. Waterborne polycarbodiimide, as a curing agent for WPU, can improve the chemical and environmental stability of the Ag/WPU coating.