Abstract
In this paper, a new high molecular weight 4-arm star polymethylmethacrylates (PMMA) is synthesized by a “core-first” method. The process is as follows: tetra-functional initiator is synthesized by esterification reaction of ethylenediamine-N,N,N',N'-tetra-2-propanol. The reaction creates a new core that is used as an initiator and employed in the homogenous atom transfer radical polymerization (ATRP) of MMA monomer. The ATRP process is carried out in presence of CuBr as a catalyst and 2,2'-bipyridine ligands to synthesize star polymers with high conversion, low polydispersity and nearly monomodal molecular distributions
Highlights
Star polymers have attracted lots of attention due to their unique properties in bulk and solution [1,2,3,4,5,6,7]
Significant attempts have been devoted to developed living/controlled polymerization based on free radical chemistry, among them controlled radical polymerization (CRP) methods [20] have been demonstrated as an effective route for preparing new polymers such as star polymers
We report that the synthesis of 4-arm star polymers using new initiator based on ethylenediamine-N,N,N’,N'-tetra-2propanol, esterified with 2-bromopropionyl bromide for the atom transfer radical polymerization (ATRP) of methyl methacrylate (MMA) in the presence of Cu(I)Br and 2,2'-bipyridine
Summary
Star polymers have attracted lots of attention due to their unique properties in bulk and solution [1,2,3,4,5,6,7]. Their synthesis are classified as: "arm first" and the "core first" methods [8,9]. In the arm first approach, preformed arms was prepared by living polymerization, reacted with a multifunctional coupling agent as the core [10,11], but in the core first method, a multifunctional core/initiator, initiate living polymerization to produce star polymer [12,13]. ATRP is probably the most robust and efficient CRP to produce well-defined polymers with controlled topology, composition and functionality [21,22,23,24]
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