Hydrated clay for catalyst removal in copper mediated atom transfer radical polymerization(a)

作者：Munirasu Selvaraj; Deshpande Ashwini; Baskaran Durairaj^*

来源：Macromolecular Rapid Communications, 2008, 29(18): 1538-1543.

DOI：10.1002/marc.200800240

• atom transfer radical polymerization (ATRP)
• catalysts
• clay
• selectivity
• synthesis

A simple method has been described to remove catalyst from the copper mediated atom transfer radical polymerization (ATRP) of benzyl methacrylate and methyl methacrylate in anisole at 25 degrees C using hydrated natural clay (sodium montmorillonite, Na-clay). The method consists of (1) addition of hydrated clay (CU(I/)clay approximate to 5 wt.-%) either during or after the polymerization, (2) oxidation of catalyst complex by exposing the terminated reaction mixture in air, and (3) filtration to obtain catalyst free polymer solution. A strong coordination of CuBr-ligand complex onto hydrated clay (10 wt.-%<H2O/clay<30 wt.-%) upon oxidation resulted in polymers with no or insignificant residual catalyst (<1.74 ppm), as determined by UV-vis and atomic absorption spectroscopy. The recovered clay exhibited expanded intercalary layers and absence of polymer within it.

• 出版日期2008-9-17