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wizyta

od 2020-09-20


Authors: Cho H.Y., Krys P, Szcześniak K., Schroeder H., Park S., Jurga S., Buback M., Matyjaszewski K.

Title: Synthesis of poly(OEOMA) using macromonomers via "grafting-through" ATRP

Source: Macromolecules

Year : 2015


Abstract:

Atom transfer radical polymerization (ATRP) of oligo(ethylene oxide) methyl ether methacrylate (OEOMA, M-n = 950 or 2080; OEOMA is also termed poly(ethylene glycol) methyl ether methacrylate, PEGMA) macromonomers was investigated as a function of initial monomer concentration, [OEOMA](0), ranging from 50 to 300 mM, and up to 4.5 kbar. Polymerizations were successfully carried out in organic solvents with [OEOMA](0) > 75 mM, whereas with [OEOMA](0) = 50 mM no monomer conversion was observed at ambient pressure, indicating that the macromonomer concentration was below its equilibrium monomer concentration ([M](e)). High pressure reduced [M](e) to a level lower than under ambient pressure, allowing polymerization at [OEOMA](0) = 50 mM up to high monomer conversion and yielding polymers with narrow molecular weight distribution. By varying the targeted degree of polymerization of OEOMA, brushlike or starlike poly(OEOMA) were prepared under both ambient and high pressure.

DOI: 10.1021/acs.macromol.5b01592   (Pobrane:  2018-03-29)

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