Reactivity of Heteropolymolybdates and Heteropolytungstates in the Cationic Polymerization of Styrene

Molecules

Ahmed Aouissi¹  Zeid Abdullah Al-Othman¹ 

[1] Chemistry Department, College of Science, King Saud University, Riyadh, Saudi Arabia

关键词: heteropoly compounds;    cationic polymerization;    polystyrene;    solid acid;   

DOI  :  10.3390/molecules15053319

来源: mdpi

【 摘 要 】

The two heteropolyacids H₃PW₁₂O₄₀ and H₃PMo₁₂O₄₀, and their homologous salts (NH₄)₃PW₁₂O₄₀, and (NH₄)₃PMo₁₂O₄₀ 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 averagemolecular weight (M_v) of polystyrene are directly proportional to the acidity strength of the heteropolyanions (H₃PW₁₂O₄₀ > H₃PMo₁₂O₄₀ > (NH₄)₃PW₁₂O₄₀ > (NH₄)₃PMo₁₂O₄₀). The highest yield (68.0%) and M_v (7,930) were obtained by using H₃PW₁₂O₄₀. In addition, H₃PW₁₂O₄₀ polymerized the styrene under mild conditions and was recyclable, and could behave as a truly heterogeneous catalyst.

【 授权许可】

CC BY   
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.