Chain Transfer Activity of ω-Unsaturated Methacrylic Oligomers in Polymerizations of Methacrylic Monomers
作者:Lillian Hutson、Julia Krstina、Catherine L. Moad、Graeme Moad、Gregory R. Morrow、Almar Postma、Ezio Rizzardo、San H. Thang
DOI:10.1021/ma049813o
日期:2004.6.1
methacrylate−hydroxyethyl methacrylate trimer (HEMA−MMA−HEMA), and a HEMA macromonomer in methyl methacrylate (MMA) polymerization. These data have been assessed with reference to our previously reported data on chain transfer of MMA macromonomers in MMA polymerizations. The transfer constants (Ctr) for MMA3 in polymerizations of methyl, ethyl, n-butyl, tert-butyl, and 2-ethylhexyl methacrylate at 60 °C are similar
对于甲基丙烯酸酯的聚合反应,已经确定了不饱和甲基丙烯酸甲酯三聚体CH 2 C(CO 2 Me)CH 2 [C(CO 2 CH 3)(CH 3)CH 2 ] 2 H(MMA 3)的链转移常数。(乙基EMA;正丁基BMA;叔丁基tBMA; 2-乙基己基EHMA),对于甲基丙烯酸丁酯(BMA 3)和甲基丙烯酸(MAA 3)的类似三聚体,甲基丙烯酸羟乙酯二聚体(HEMA 2),甲基丙烯酸羟乙酯-甲基丙烯酸甲酯-甲基丙烯酸羟乙酯三聚体(HEMA-MMA-HEMA)和HMMA大分子单体在甲基丙烯酸甲酯(MMA)聚合中。这些数据已参照我们先前报道的有关MMA聚合中MMA大分子单体链转移的数据进行了评估。甲基丙烯酸甲酯,乙基,正丁基,叔丁基和甲基丙烯酸2-乙基己酯在60°C聚合中的MMA 3传递常数(C tr)相似(〜0.18)。所述Ç TR MAA的3(在60℃下在0.28 2-丁酮溶剂)在MMA聚合是约