Reverse atom transfer radical polymerization of (-)-menthyl methacrylate

The reverse atom transfer radical polymerization(RATRP) of (-)-menthyl methacrylate ((-)-MnMA) with AIBN(AIBN/CuCl2/bipyridine(bipy) or (-)sparteine((-)Sp) =1/2/4) initiating system in THF has been studied. The dependence of the specific rotation on molecular weight was investigated.

Polymerization of acrylonitrile with (diisopropylamido) bis (indenyl) lanthanides

The polymerization of acrylonitrile was studied using ( diisopropylamido) his ( indenyl) lanthanides, Ind(2)LnN(i-Pr)(2)(Ln = Y, Yb) as a single-component catalyst. The effects of the amount of catalyst, monomer concentration and polymerization temperature on catalytic activity and molecular weight of polyacrylonitrile (PAN) were studied. The results show that the catalytic activity is raised obviously with rising polymerization temperature. The monomer conversion reaches 64% under polymerization temperature, monomer concentration and catalyst concentration are 50 degreesC, 5.1 mol . L (-1) and 0. 3 % (molar ratio) sequentially. The conversion and molecular weight of the polymer increase appreciably with adding additive, PhONa. When the molar ratio of PhONa to the catalyst is three I the conversion and the molecular weight is 76% and 1.32 x 10(4), respectively. The initiation mechanism for the polymerization of acrylonitrile was proposed.

Methanol tolerant FeTPP-Pt/C Co-catalysts for the electroreduction of oxygen

It was found for the first time that iron tetraphenylporphyrin (FeTPP)-Pt/C showed the good activity for the electroreduction of oxygen and methanol tolerant ability. Their performances were related to the heat-treatment temperature.