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Poly(ester amide)s derived from <SC>L</SC>-tartaric acid and amino alcohols. II. Aregic polymers

Authors :
Regaño, Celia
Ilarduya, Antxon Martínez De
Iribarren, José I.
Muñoz-Guerra, Sebastián
Source :
Journal of Polymer Science Part A: Polymer Chemistry; 1 August 2000, Vol. 38 Issue: 15 p2687-2696, 10p
Publication Year :
2000

Abstract

A series of aregic poly(ester amide)s (a-PEAT6) with ester/amide ratios (a : b) varying from 1 : 19 to 1 : 2 were prepared with &lt;SC&gt;L&lt;/SC&gt;-tartaric acid, 6-aminohexanol, and 1,6 hexanediamine as the starting materials. Polycondensation in a solution of the diamine with mixtures of pentachlorophenyl-activated di-O-methyl-&lt;SC&gt;L&lt;/SC&gt;-tartaric and 6-aminohexyl-di-O-methyl-&lt;SC&gt;L&lt;/SC&gt;-tartaric acids led to a-PEAT6(a : b), with the a : b ratio determined by the composition of the feed. The newly synthesized poly(ester amide)s were characterized by elemental analysis, size exclusion chromatography, and IR and NMR spectroscopy. They had number-average molecular weights between 25,000 and 45,000 and were highly crystalline, showing melting temperatures ranging from 100 to 230 &#176;C and glass-transition temperatures oscillating between 50 and 100 &#176;C. The thermal degradation of a-PEAT6(a : b) began above 200 &#176;C and concluded with a final weight loss between 60 and 90% of the initial mass. The process evolved with the formation of cyclic tartarimide units and extensive main-chain scissions. The degradation mechanism is discussed in relation to the chemical composition and microstructure of the polymers. &#169; 2000 John Wiley &amp; Sons, Inc. J Polym Sci A: Polym Chem 38: 2687–2696, 2000

Details

Language :
English
ISSN :
0887624X and 10990518
Volume :
38
Issue :
15
Database :
Supplemental Index
Journal :
Journal of Polymer Science Part A: Polymer Chemistry
Publication Type :
Periodical
Accession number :
ejs1795428
Full Text :
https://doi.org/10.1002/1099-0518(20000801)38:15<2687::AID-POLA80>3.0.CO;2-Q