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Reactivity of heteropolymolybdates and heteropolytungstates in the cationic polymerization of styrene.

Ahmed Aouissi, Zeid Abdullah Al-Othman, and Holeil Al-Anezi

Molecules 15(5):3319-28 (2010) PMID 20657482

The two heteropolyacids H(3)PW(12)O(40) and H(3)PMo(12)O(40), and their homologous salts (NH(4))(3)PW(12)O(40), and (NH(4))(3)PMo(12)O(40) were prepared and tested in the cationic polymerization of styrene. The results showed that the heteropolytungstates were more reactive than the heteropolymolybdates. It has been found that the yield and the viscosity average molecular weight (M(v)) of polystyrene are directly proportional to the acidity strength of the heteropolyanions (H(3)PW(12)O(40) > H(3)PMo(12)O(40) > (NH(4))(3)PW(12)O(40) > (NH(4))(3)PMo(12)O(40)). The highest yield (68.0%) and M(v) (7,930) were obtained by using H(3)PW(12)O(40). In addition, H(3)PW(12)O(40) polymerized the styrene under mild conditions and was recyclable, and could behave as a truly heterogeneous catalyst.

DOI: 10.3390/molecules15053319
Version: za2963e q8zac q8zba q8zc9 q8zdc q8zea q8zf6 q8zgf
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