Does “Linear PPS” make a superior injection molding compound?
We use uncured linear PPS as well as cured PPS in our various Ryton PPS products, depending on the desired properties of the product. For the most part, we prefer to use cured PPS polymers for injection molding compounds because they provide more of the benefits generally desired from PPS compounds. PPS curing is a process of heating the PPS polymer in air to increase its molecular weight through thermal-oxidative chain extension and cross-linking reactions. Uncured linear PPS will typically have more ductility than cured PPS of similar molecular weight, however cured PPS exhibits better dimensional stability and creep resistance. Furthermore, since any uncured linear PPS polymer will undergo curing when heated in air, cured PPS tends to exhibit less pronounced changes due to thermal aging. Certain compounds made using cured PPS, such as Ryton R-4-200or Ryton R-4XT, provide mechanical properties comparable to any compounds based exclusively on uncured linear PPS. For more information s
