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4852357 
Book/Book Chapter 
The effect of nano-hydrotalcite-zinc oxide on flame retardant and smoke suppression of flexible PVC 
Yan, CM; Zhang, ZH; He, LH; Gao, LJ; Fang, SM 
2007 
Chemical Industry Press 
Beijing, China 
Proceedings of the 2007 International Conference on Advanced Fibers and Polymer Materials Vols 1 and 2 
950-952 
English 
WOS:000251952000298 
To reduce the smoke release of flexible poly (vinyl chloride) (PVC) as its burning, nano-hydrotalcite and nano-Zinc oxide (ZnO) were used to modify the polymer. The results indicated that the addition of hydrotalcite-ZnO had a significant effect for flame retardant. The limiting oxygen index (LOI) is up to a maximum value and the smoke density rank (SDR) exhibited a lower value when the weight percentages of hydrotalcite and ZnO in PVC are 3% and 2%, respectively. Thermal stabilities of the modified PVC and decomposed products were investigated by means of thermogravimetry and prolysis-gas chromatography-mass spectrum (Py-GC-MS). As a result, hydrotalcite-ZnO obviously accelerated decomposition of PVC to release hydrogen chloride, and the decomposed PVC consequently produced the trans-conjugated polyene sequences, which easily formed cross-linked structures. However, a cyclization reaction in PVC chain without the additives produced aromatic compounds such as benzene and naphthalene at 400 degrees C. Even though the amount of aromatic compounds was released from the PVC modified with hydrotalcite-ZnO at the temperature of 600 degrees C, the content of the decomposed products is relatively lower, comparing with unmodified PVC. 
PVC; hydrotalcite; zinc oxide; flame retardant; smoke suppression 
1st 
Chemical Industry Press 
9787122012234 
International Conference on Advanced Fibers and Polymer Materials 
Shanghai, China 
October 15-17, 2007