TY - JOUR
T1 - Green composites of poly(3-hydroxybutyrate) and curaua fibers
T2 - Morphology and physical, thermal, and mechanical properties
AU - Scalioni, Lucas V.
AU - Gutiérrez, Miguel C.
AU - Felisberti, Maria I.
N1 - Publisher Copyright:
© 2016 Wiley Periodicals, Inc.
PY - 2017/4/10
Y1 - 2017/4/10
N2 - In this article, we report the morphology and thermal, mechanical and physical properties of poly(3-hydroxybutyrate) (PHB)/curaua composites containing triethyl citrate (TEC) as the plasticizer. The composites were prepared by mechanical mixing using pristine and chemically treated fibers (10 wt %) and TEC (30 wt %) and characterized by differential scanning calorimetry, dynamic mechanical analysis, X-ray diffraction, small angle X-ray scattering, polarized optical microscopy, scanning electron microscopy, tensile tests, impact resistance test, thermodilatometry, and thermal conductivity measurements. The curaua fibers acted as nucleating agent and strongly influenced the morphology of the crystalline phase of PHB, increasing the lamella thickness, decreasing the crystal size and inducing spherulite–axialite transition. These characteristics of the PHB crystalline phase determined all the properties of the composites. The tensile properties of the composites were comparable with those of neat PHB, while the impact resistance of composites was comparable with that of plasticized PHB. The higher heat capacity and thermal expansion coefficient and the lower thermal conductivity of the composites compared with neat PHB reflect the morphological changes in the PHB crystalline phase. The strategy of developing a green polymeric material from ecofriendly components exhibiting a good balance of properties by combining curaua fibers, TEC, and PHB was successful.
AB - In this article, we report the morphology and thermal, mechanical and physical properties of poly(3-hydroxybutyrate) (PHB)/curaua composites containing triethyl citrate (TEC) as the plasticizer. The composites were prepared by mechanical mixing using pristine and chemically treated fibers (10 wt %) and TEC (30 wt %) and characterized by differential scanning calorimetry, dynamic mechanical analysis, X-ray diffraction, small angle X-ray scattering, polarized optical microscopy, scanning electron microscopy, tensile tests, impact resistance test, thermodilatometry, and thermal conductivity measurements. The curaua fibers acted as nucleating agent and strongly influenced the morphology of the crystalline phase of PHB, increasing the lamella thickness, decreasing the crystal size and inducing spherulite–axialite transition. These characteristics of the PHB crystalline phase determined all the properties of the composites. The tensile properties of the composites were comparable with those of neat PHB, while the impact resistance of composites was comparable with that of plasticized PHB. The higher heat capacity and thermal expansion coefficient and the lower thermal conductivity of the composites compared with neat PHB reflect the morphological changes in the PHB crystalline phase. The strategy of developing a green polymeric material from ecofriendly components exhibiting a good balance of properties by combining curaua fibers, TEC, and PHB was successful.
KW - biopolymers and renewable polymers
KW - composites
KW - mechanical properties
KW - morphology
KW - thermal properties
UR - http://www.scopus.com/inward/record.url?scp=85006124983&partnerID=8YFLogxK
U2 - 10.1002/app.44676
DO - 10.1002/app.44676
M3 - Artículo
AN - SCOPUS:85006124983
SN - 0021-8995
VL - 134
JO - Journal of Applied Polymer Science
JF - Journal of Applied Polymer Science
IS - 14
M1 - 44676
ER -