Synthesis and Characterization of Complex Mixtures Consisting of Cyclic and Linear Polyamides from EthylBis-Ketal Galactarates

Autor:	Roger A. Laine, William H. Daly, Rafael Cueto, Ioan I. Negulescu, Cornelia Rosu
Rok vydání:	2013
Předmět:	Materials science Condensation polymer Polymers and Plastics General Chemistry Water insoluble Characterization (materials science) chemistry.chemical_compound chemistry Yield (chemistry) Diamine Polymer chemistry Polyamide Materials Chemistry Ceramics and Composites Trifluoroacetic acid Organic chemistry Fourier transform infrared spectroscopy
Zdroj:	Journal of Macromolecular Science, Part A. 50:940-952
ISSN:	1520-5738 1060-1325
DOI:	10.1080/10601325.2013.813795
Popis:	Bis-ketal-protected diethyl galactarate was condensed with different diamines to prepare sugar-based polyamides. Ketal-protected polyamides, which are soluble in organic solvents, were deprotected with 90% trifluoroacetic acid to yield water insoluble materials. FTIR, NMR, GPC, MALDI-TOF, ESI and TGA techniques were used to characterize the structure and the properties of these biodegradable materials. D-galactaric acid-based polyamides are complex mixtures of cyclic and linear structures. High molecular weight linear polymer formation was limited by competitive cyclization reactions. The percentage of cyclization was highly dependent on the nature of the diamine used. Polycondensation with linear aliphatic diamines favored the formation of macrocycles, identified by MALDI-TOF and ESI.
Databáze:	OpenAIRE
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