The stabilization effect of pentaerythritol (Pe) combined with calcium and zinc stearates (CaSt 2 /ZnSt 2 ) on chlorinated poly(vinyl chloride) (CPVC) is investigated. Congo red and dynamic thermal stability data indicate that Pe alone has a mild stabilizing effect on the degradation of CPVC. Addition of mixed CaSt 2 /ZnSt 2 to this system leads to a significant improvement in stability. Thermogravimetric studies indicate that premature weight loss, not observed with either Pe alone or with CaSt 2 /ZnSt 2 , is observed when the combined Pe/CaSt 2 /ZnSt 2 systems are employed to stabilize CPVC. Fourier transform infrared (FTIR) spectroscopy and electrospray ionization mass spectrometry (ESIMS) both indicate that condensation (oligomerization) and chlorination of Pe occur when Pe and Pe/CaSt 2 /ZnSt 2 systems are employed to stabilize CPVC. J. VINYL ADDIT. TECHNOL., 2011.
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