resumo
Random poly(ester amide)s are synthesized from succinic acid, ethylene glycol or 1,4-butanediol and different aliphatic amido diols - symmetric alpha,omega-diols containing two amide moieties. The formation of chain-terminating N-succinimide end groups, which limit the molecular weight attainable by common synthetic strategies, is effectively suppressed. Poly(ester amide)s crystallize in a suprastructure similar to that of even-even polyamides. The thermal properties of both types of poly(ester amide)s synthesized are considerably improved and transition temperatures are tunable by changing the ratio of aliphatic diol to rapidly crystallizing amido diol in the feed. Using ethylene glycol as diol component, T-g and T-m of the material could be enhanced from -12 to -2 degrees C and 97 to 157 degrees C, respectively, while an increase from -33 to -8 degrees C and 115-153 degrees C was observed for their 1,4-butanediol derived counterparts. Furthermore, the slow crystallization rate of poly(ethylene succinate) from molten state could be significantly accelerated by the introduction of amide moieties into the polymer backbone.
palavras-chave
POLY(BUTYLENE SUCCINATE); ALIPHATIC POLY(ESTER-AMIDE)S; COPOLYESTERS; DEGRADATION; COPOLYMERS; PBS; POLYESTERS; KINETICS; BLOCKS; ACID
categoria
Polymer Science
autores
Kluge, M; Rennhofer, H; Lichtenegger, HC; Liebner, FW; Robert, T
nossos autores
Wolfgang Falk Liebner
Professor Catedrático Convidadoagradecimentos
The authors are very grateful for the financial support provided by the Fraunhofer Institute for Wood Research Wilhelm-Klauditz-Institut WKI. Alexander Omelan (Fraunhofer WKI) is thanked for performing the GC-MS measurements.