Authors Jakisch, L. ; Garaleh, M. ; Schäfer, M. ; Mordvinkin, A. ; Saalwächter, K. ; Böhme, F.
Title Synthesis and structural NMR characterization of novel PPG/PCL conetworks based upon hetero-complementary coupling reactions
Date 01.02.2018
Number 53351
Abstract A new approach to hybrid model network formation based upon heterocomplementary end-linking of four-arm star poly-e-caprolactone (PCL) and linear polypropylene glycol (PPG) precursors is demonstrated. Specifically, hydroxy-terminated PCL([BOND]OH)4 and an amino-terminated linear PPG([BOND]NH2)2 are reacted with a bifunctional coupling agent containing one carboxylic acid chloride group and one oxazinone group. PCL([BOND]OH)4 is first reacted with the former in a solution, and the so-obtained oxazinone-terminated intermediate is then reacted with PPG([BOND]NH2)2 to form a network both in the solution and in the melt. A strong effect of electron-withdrawing groups on the reactivity of the oxazinone group, and thus on the network formation, is evidenced. Network structure and properties are studied by swelling experiments and low-field multiple-quantum (MQ) NMR, which confirm the successful formation of hybrid networks and provide information on the significant network inhomogeneities. On the methodological side, a reliable approach to MQ NMR data analysis for networks of variable degree of inhomogeneity is discussed.
Journal Macromolecular Chemistry and Physics
Citation Macromolecular Chemistry and Physics 219 (2018) ID1700327

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