Quasi-alternating polyesteramides from ε-caprolactone and α-amino acids

• Published in: Journal of applied polymer science Vol. 133; no. 46; pp. np - n/a
• Main Authors: Ali Mohamed, Abdoulkader, Salhi, Slim, Abid, Souhir, El Gharbi, Rachid, Fradet, Alain
• Format: Journal Article
• Language: English
• Published: Blackwell Publishing Ltd 10.12.2016
• Subjects: Amides; biopolymers and renewable polymers; Glycine; Melting; Melts; Microstructure; Modulus of elasticity; Nuclear reactions; Polyesteramides; polyesters; α-amino acids
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.44220

ABSTRACT Glycine‐ɛ‐caprolactone‐based and α‐alanine‐ɛ‐caprolactone‐based polyesteramides with a strong tendency to form alternating sequences (degree of randomness = 1.64 and 1.31) were synthesized by melt polycondensation of intermediate hydroxy‐ and ethyl ester‐terminated amides. These intermediates were synthesized by the reaction of equimolar amounts of ɛ‐caprolactone and glycine or L‐α‐alanine ethyl esters in mild conditions. The structure and microstructure of these polyesteramides are discussed on the basis of an in‐depth nuclear magnetic resonance study. Both polyesteramides are semi‐crystalline, but the glycine‐based one presents the highest melting enthalpy. This polyesteramide also exhibits higher Young's modulus and stress at break than its α‐ and β‐alanine counterparts. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44220.