LUBRICATION MECHANISM OF POLY(VINYL CHLORIDE) COMPOUNDS: AN UNDERSTANDING OF LUBRICANT FAILURE AT HIGHER PROCESSING TEMPERATURES

摘要

Poly(vinyl chloride) (PVC) compounds require metal lubrication and polymer to polymer lubrication for good processing performance. Much of the mechanism for PVC's lubrication has been elucidated over the years. One point has not been completely understood, that is the "lubricant failure" at higher processing temperatures where the compound becomes more brittle. This is contrary to what might be expected with better PVC fusion (gelation). This paper discusses the mechanism involved, which is lubricant inversion, where the lubricant goes from the continuous phase to becomes the discontinuous phase.