Electrolytic Copper Plating Bath Trace Dosing for Microelectronics Substrate Fabrication
Micro-dosing acid copper bath additives within five percent targets via closed-loop voltammetry prevents microvia voiding and lowers chemical scrap expenses.
Polyethylene Glycol
Meaning
Water-soluble polyether compounds with the general formula H(OCH2CH2)nOH find wide application in pharmaceuticals and cosmetics. The compound polyethylene glycol is synthesized by the polymerization of ethylene oxide in the presence of water or ethylene glycol. This chemical acts as a surfactant and lubricant due to its low toxicity and high chemical stability.
It is available in various molecular weights which determine its physical state from liquid to waxy solid.
Chemical Property
Thermodynamic stability and high solubility in water make this substance a versatile additive. Different grades of polyethylene glycol exhibit distinct viscosity levels depending on their polymer chain length. The substance is non-volatile and resists thermal degradation.
Industrial Application
Manufacturing electronics and batteries requires wetting agents and binders to ensure smooth deposition of materials. In these setups, polyethylene glycol is added to electroplating baths to control the rate of metal deposition on the circuit board. This addition helps prevent uneven build-ups of copper or solder, which would otherwise lead to failure of the electronic component during operation.
Compliance Standard
Regulation of chemical additives used in food contact materials and medical packaging is overseen by the National Medical Products Administration in China. Utilizing polyethylene glycol requires verification of its purity and molecular weight distribution to ensure compliance with national standards. Importers must provide safety data sheets and trace reports from approved testing laboratories to clear customs.
These measures prevent the use of contaminated industrial-grade batches in consumer-facing products.
Kirkendall Void Formation Mechanisms at Lead Free Copper Interface Boundaries
Suppressing Kirkendall voiding demands controlling substrate copper electroplating additives and microalloying solders to balance diffusion rates.