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- Title
Synthesis and Structural NMR Characterization of Novel PPG/PCL Conetworks Based upon Heterocomplementary Coupling Reactions.
- Authors
Jakisch, Lothar; Garaleh, Mazen; Schäfer, Mareen; Mordvinkin, Anton; Saalwächter, Kay; Böhme, Frank
- Abstract
Abstract: A new approach to hybrid model network formation based upon heterocomplementary end‐linking of four‐arm star poly‐ε‐caprolactone (PCL) and linear polypropylene glycol (PPG) precursors is demonstrated. Specifically, hydroxy‐terminated <bold>PCL</bold>(OH)4 and an amino‐terminated linear <bold>PPG</bold>(NH2)2 are reacted with a bifunctional coupling agent containing one carboxylic acid chloride group and one oxazinone group. <bold>PCL</bold>(OH)4 is first reacted with the former in a solution, and the so‐obtained oxazinone‐terminated intermediate is then reacted with PPG(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.
- Subjects
NUCLEAR magnetic resonance; COUPLING reactions (Chemistry); POLYCAPROLACTONE; POLYPROPYLENE oxide; CHEMICAL precursors; CARBOXYLIC acids
- Publication
Macromolecular Chemistry & Physics, 2018, Vol 219, Issue 3, p1
- ISSN
1022-1352
- Publication type
Article
- DOI
10.1002/macp.201700327