The quantity of potassium hydroxide needed for neutralization of half of the anhydride groups, all free acids and all carboxyl-terminated groups of an unsaturated polyester resin (UPR), is indicated ...

WHEN an equal volume of 3 percent hydrogen peroxide is added to a slightly acidified ascorbic acid solution, no appreciable effect on the indophenol titration value is observed, unless iron or copper ...

The determination of diethylene glycol content, isophthalic acid content, intrinsic viscosity (ASTM D4603), and acid number (AN) in polyethylene terephthalate (PET) is a lengthy and challenging ...