Environmentally degradable aliphatic poly(ester-amide)s based on short, symmetrical and uniform bisamide-diol blocks, 1. Synthesis and interchange reactions

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Stapert, Hendrik R. and Bouwens, Anna-Malin and Dijkstra, Pieter J. and Feijen, Jan (1999) Environmentally degradable aliphatic poly(ester-amide)s based on short, symmetrical and uniform bisamide-diol blocks, 1. Synthesis and interchange reactions. Macromolecular Chemistry and Physics, 200 (8). pp. 1921-1929. ISSN 1022-1352

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Abstract:Aliphatic poly(ester-amide)s were prepared by polycondensation of N,N-1,4 butanediylbis(6-hydroxyhexanamide), dimethyl adipate, and 1,4-butanediol, using Ti(OBu)4 as a catalyst. For polymers with a bisamide monomer content below 25 mol-%, Mw between 20 000 and 50 000 were obtained after 10-12 h polymerization at temperatures of 170-190°C. Mw values decrease with increasing amide content. The symmetrical and uniform structure of the amide segments is retained in the polymer. Less than 5 mol-% of the symmetry of the amide segments is lost due to alcoholysis of the amide bonds in the first h of polymerization as found from NMR analysis. When the polymerizations were performed using adipic acid instead of dimethyl adipate a significant loss (up to 30 mol-%) of the symmetry of the amide segments occurs through acidolysis.
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Copyright:© 1999 Wiley InterScience
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/71523
Official URL:http://www3.interscience.wiley.com/journal/62502891/abstract
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