Monomer-selective living copolymerization of butyl acrylate and methyl methacrylate with a difunctional initiator: a facile synthesis of ABA-type triblock copolymer
作者： Tatsuki Kitayama , Mariko Ogawa , Takehiro Kawauchi
DOI: 10.1016/S0032-3861(03)00447-6
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摘要: Abstract A difunctional initiator was synthesized through the addition reaction of tert-butyllithium (t-BuLi) to 1,3-diisopropenylbenzene (DIB) in presence triethylamine (Et3N). Under optimized conditions, that is dropwise a mixture DIB and Et3N stirred toluene solution t-BuLi at 50 °C molar ratio DIB/Et3N/t-BuLi=1/2/2, formed without oligomeriazation DIB. Copolymerization butyl acrylate (n-BuA) methyl methacrylate (MMA) with bis(2,6-di-tert-butylphenoxy)ethylaluminum [EtAl(ODBP)2] low temperature proceeded monomer-selective manner; n-BuA polymerized first, followed by MMA polymerization, form an ABA-type triblock copolymer [PMMA-block-poly(n-BuA)-block-PMMA], which exhibits microphase separation.
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