Inhibition of the degradation of poly(vinyl chloride) by its modification with 5-pyrimidine carbonitrile (1,2,3,4- tetrahydro-4-oxo-6-phenyl-2-thioxo)

Abstract

The reaction of poly(vinyl chloride) (PVC) with 5-pyrimidine carbonitrile (1,2,3,4-tetrahydro-4-oxo-6-phenyl-2-thioxo) has been studied. The thermal stability of the modified polymer is improved markedly compared with the unmodified polymer. The stability improvement is attributed to the replacement of the labile chlorine atoms by more stable thio groups. The modified polymer also showed a lower extent of discoloration against ultraviolet rays compared with the unmodified PVC. © 1998 SCI.