Chlorinated poly(vinyl chloride) stabilization by pentaerythritol/calcium-zinc stearate mixtures: The fate of pentaerythritol
(1–8)Journal of Vinyl and Additive Technology 17, #1 (2011)
Liao, He and Chen of Sichuan Universit, China, studied the stabilization effect of pentaerythritol (Pe) combined with calcium and zinc stearates (CaSt2/ZnSt2) on chlorinated poly(vinyl chloride) (CPVC).  Congo red and dynamic thermal stability data indicate that Pe alone has a mild stabilizing effect on the degradation of CPVC. Addition of mixed CaSt2/ZnSt2 to this system leads to a significant improvement in stability.  Both indicate that condensation (oligomerization) and chlorination of Pe occur when Pe and Pe/CaSt2/ZnSt2 systems are employed to stabilize CPVC.   (RDC 2/24/2011)