本研究使用CoBF與CoPhBF當鏈轉移劑，對醋酸乙烯酯(VAc)與甲基丙烯酸甲酯(MMA)進行催化鏈轉移共聚合，合成出低分子量且尾端具有雙鍵基團的巨單體(macromonomer)。以元素分析儀和紫外光-可見光光譜儀來鑑定鈷二價錯合物(CoBF與CoPhBF)。探討在催化鏈轉移共聚合反應中，單體莫耳進料比、鈷二價錯合物濃度與種類、反應時間等因素如何影響其巨單體的分子量、組成比例，以及雙鍵的形成。於是發現當MMA單體進料量上升，會導致其分子量下降，其組成仍會符合terminal model，代表鈷二價錯合物的存在並不會影響此系統的單體活性比；當鈷二價錯合物濃度上升，也會使分子量往下降，但其組成不變。從1H NMR與COSY圖譜中，得知巨單體尾端雙鍵基團的結構皆是由MMA組成的，VAc單體並不會進行鏈轉移反應。從Mayo equation得知CoBF的鏈轉移常數為1130；CoPhBF的鏈轉移常數為2140，代表CoPhBF的鏈轉移能力較佳。將P(VAc-co-MMA) macromonomer與丙烯腈(AN)進行接枝共聚合，從1H NMR圖譜中得知巨單體的雙鍵特徵峰訊號消失，且接枝共聚物上的VAc和MMA之比例與巨單體上的比例相似，代表接枝共聚物有成功合出來。

In this study, the catalytic chain transfer copolymerization of monosubstituted monomers (CH2=CHX, vinyl acetate (VAc)) and α-methylvinyl monomer (CH2=C(CH3)Y, methyl methacrylate (MMA) using CoBF or CoPhBF was used to synthesize macromonomers.With different feed molar ratios or differernt Co(II) complex concentration, we show how the molecular weight, copolymer composition and macromonomer purity of macromonomers by 1H NMR, COSY and GPC. With increasing MMA and increasing Co(II) complex concentration, we found that the molecular weight of copolymers becomes smaller. Moreover, addition of cobalt(II) catalytic chain transfer agent does not change the reactivity ratios of MMA and VAc. Furthermore, the poly(vinyl acetate-co-MMA) macromonomer can copolymerize with acrylonitrile (AN) to synthesize P(VAc-co-MMA)-g-PAN graft copolymer.

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