A series of random polyesteramides (PEAs) with a range of molar composition from 90/10 to 50/50 were synthesized by direct melt polycondensation of ε-caprolactone and L-alanine. Their structure was fully characterized by Fourier transform IR and NMR spectroscopy. The resulting copolymers are completely amorphous with the exception of PEA-90/10 which possesses a semicrystalline structure. These PEAs present increasing glass transition temperatures at increasing L-alanine contents and exhibit fairly good thermal stability with 10% mass loss temperatures reaching 315°C.
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