セリウム(IV)イオンによるビニルモノマー/セルロースグラフト共重合:重合開始点の詳細な検討

抄録

Styrene has been graftcopolymerized with aqueous solutions of Ce (NO₃)₆•2NH₄(CAN) onto cellulose samples modified chemically in different manner, i.e., oxidized, reduced and oximated. The polymerization was conducted in the absence of mineral acid. It was found that the copolymerization did proceed not for the oxidized and oximated cellulose but only for the reduced cellulose, in which intact C₁-C₂ glycols are retained in the reducing endgroup. From these results it was confirmed that the C₁-C₂ glycol acts as the grafting site. Truely grafted polystyrene side-chains were isolated from graft product by using a technique of thin-layer chromatography combined with acid hydrolysis of cellulose backbone and the chemical constitution of their chain ends have been investigated with a paper-chromatographic technique. It was found that the side chain contained aldehyde residue at their chain ends. This result implied that the grafting grew up from a free radical produced on the C₁ position of reducing cellulose-endgroup.