Random and quasi-alternating polyesteramides deriving from ε-caprolactone and β-alanine

Poly(ester-amide)s Derived From Adipic Acid, 1,4-Butanediol and β-Alanine: Synthesis and Characterization

“…The temperature at which 5% of weight was lost (T d,5% ) did not show a clear relationship with aliphatic sequence length or with amide/ester ratio (46).…”

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

“…Tensile tests were carried out on injection‐molded specimens of PCG (Table and Figure ). The results were compared with the previously synthesized random and quasi‐alternating polyesteramides, synthesized from equimolar amounts of CL and β‐alanine . PCA was too fragile to allow the preparation of tensile specimens, likely due to its low degree of crystallinity.…”

“…Random polyesteramides can be prepared by simple procedures that do not require the use of solvents or expensive monomers like NCAs. Some studies have reported the synthesis of random amino acid‐based polyesteramides by the direct reaction of amino acids with cyclic esters or by the direct bulk polycondensation of amino acids and α‐hydroxyacids …”

“…In a previous work, we reported the synthesis of “quasi‐alternating” polyesteramides by simple bulk polycondensation between the hydroxy‐ and ethyl ester‐terminated dimer of β‐alanine and ɛ‐caprolactone . Since hydroxy‐amide and ethyl ester‐amide interchange reactions are much slower than ethyl ester‐hydroxy polycondensation, randomization was avoided during the bulk polycondensation step and a quasi‐alternating amino acid‐based polyesteramides was obtained.…”

Aliphatic poly(ester amide)s from sebacic acid and aminoalcohols of different chain length: Synthesis, characterization and soil burial degradation

“…Since the preparation of the first poly(ester amide)s from the melt mixing of the corresponding homopolymers [7], poly(amide ester)s have been synthesized as random [8], alternating, block or segmented polymers [9]. Poly(ester amide)s can be essentially classified into polydepsipeptides [10], carbohydrate derivatives [11,12], random copolymers based on monomers of commercial nylons and polyesters (i.e., 3-caprolactam, 3-caprolactone, 1,6-hexanediamine) [13,14], and amino acid derivatives [15e18].…”