Controlled copolymerization of the functional 5-membered lactone monomer, α-bromo-γ-butyrolactone, via selective organocatalysis. (22nd March 2016)

• Record Type: Journal Article
• Authors: Undin, Jenny; Olsén, Peter; Godfrey, Jamie; Odelius, Karin; Albertsson, Ann-Christine
• Is Part Of: Polymer. Volume 87(2016)
• Page Start: 17
• Page End: 25
• Publication Date: 2016-03-22
• Subjects: α-Bromo-γ-butyrolactone (αBrγBL) -- Diphenyl phosphate (DPP) -- CRP; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2016.01.067
• Languages: English
• ISSNs: 0032-3861

Abstract

Abstract: The selective nature of organic catalysts has been exploited to synthesize copolymers of the functional monomer, α-bromo-γ-butyrolactone (αBrγBL), with trimethylene carbonate (TMC), 2-allyloxymethyl-2-ethyl-trimethylene carbonate (AOMEC) and ε-caprolactone (εCL) with excellent control. The high control is attributed to high selectivity and reactivity at ambient reaction temperatures, which suppresses the degree of side reactions (e.g., transesterification) that inherently plague this class of co-monomers. In particular, good results were obtained using diphenyl phosphate (DPP) as a catalyst, resulting in copolymers with low dispersities (ÐM ) (i.e., approximately 1.08) and number average molecular weights (Mn ) of approximately 20, 000 g/mol. The high control opened the possibility to construct more complex polymeric structures, exemplified via the synthesis of a multifunctional triblock copolymer composed of AOMEC as the center block, flanked with a statistical copolymer consisting of ɛCL and αBrγBL. The subsequent grafting of methyl acrylate (MA) via Cu(0)-mediated CRP on the copolymers resulted in graft copolymers with a final ÐM of less than 1.2. Graphical abstract: Highlights: Copolymerization of the functional 5-membered lactone monomer, α-bromo-γ-butyrolactone (αBrγBL), with TMC, AOMEC and εCL. Copolymers with low dispersities (ÐM) were obtained when using diphenyl phosphate (DPP) as a catalyst. Grafting of MA via Cu(0)-mediated CRP on the copolymers resulted in graft copolymers with a final ÐM of less than 1.2.