The compositional variables utilized for the were: (1) QAS moiety concentration, (2) hydride-to-vinyl ratio for crosslinking, and (3) hydride equivalent weight of the PMHS-PDMS starting polymer.
A contingency analysis was performed in order to understand the effect of PHMS-PDMS hydride equivalent weight of the starting copolymer on coating film uniformity/integrity.
2, the chance of obtaining a coating having a rating of 2 for the relative degree of film uniformity/integrity is higher when the PMHS-PDMS copolymer possessing hydride equivalent weight of 135 is used.
Keywords: Dielectric spectroscopy, DES, FDEMS, coating resin synthesis, residual monomer, Michael reaction, acetoacetate, polyacrylate, acrylic acid, esterification, viscosity, acid number, epoxy equivalent weight, polyurethane prepolymer, residual isocyanate, weight percent NCO, infrared spectroscopy, ATR-FTIR, titration, in-process samples, off-line testing, real-time monitoring, in-situ monitoring, gel permeation chromatography, GPC, electrochemical impedance spectroscopy, QC/QA testing, manufacturing process control
Examples of such tests used in quality control include titrations (acid number, epoxy equivalent weight, and residual isocyanate), product solubility measurements (cloud point), product viscosity (Gardner, bubble seconds, cone and plate), chromatographic techniques (GC, LC, GPC), and the strength of a characteristic peak in the ATR-FTIR spectrum, to name a few.