INVESTIGADORES
NINAGO mario daniel
artículos
Título:
Effects of Branches on the Isothermal Crystallization of Copolymers Based on Poly(ϵ-caprolactone)
Autor/es:
NINAGO, MARIO D.; REDONDO, F. LEONARDO; DE FREITAS, AUGUSTO G. O.; GIACOMELLI, CRISTIANO; CIOLINO, ANDRÉS E.; VILLAR, MARCELO A.
Revista:
MACROMOLECULAR SYMPOSIA
Editorial:
WILEY
Referencias:
Año: 2019 vol. 383
ISSN:
1022-1360
Resumen:
A linear poly(e-caprolactone), PCL, and grafted copolymers based on poly(2-hydroxyethylmethacrylate) and poly(e-caprolactone) are used to study theeffect of branches on PCL crystallization process. Copolymers are synthetizedby a combination of ring opening polymerization and reversible additionfragmentation chain transfer polymerization, showing molar masses between32 000 and 46 000 g mol1 with Mw/Mn lower than 1.19. Isothermal crystallizationkinetic is performed by Differential Scanning Calorimetry combiningAvrami and Hoffman-Weeks theories. Regarding to Avrami parameters,copolymers exhibited half-life crystallization times 42 times higher than PCLhomopolymer and two-dimensional crystallization growth. Copolymers? growingrate values are 51 times higher than PCL values according to Hoffman-Weeks equation. These results suggest that interaction of grafted chainscould hinder the rearrangement of PCL by reducing their final crystallizationcapacity.