Mechanical and morphological properties of LDPE/ PHB blends filled with castor oil pressed cake

Blends of PHB and LDPE were prepared by melt mixing in a twin screw extruder. Castor oil cake (CC) was used as filler for the blends. The design of experiments (DOE) technique was used to evaluate the effect of the components proportion on the materials properties. The mechanical properties and morp...

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Bibliographic Details
Published in:Materials research (São Carlos, São Paulo, Brazil) São Paulo, Brazil), 2014-01, Vol.17 (1), p.97-105
Main Authors: Burlein, Gustavo A. D., Rocha, Marisa C. G.
Format: Article
Language:English
Subjects:
castor oil pressed cake
ENGINEERING, CHEMICAL
low density polyethylene
MATERIALS SCIENCE, MULTIDISCIPLINARY
mechanical properties
METALLURGY & METALLURGICAL ENGINEERING
mixture design of experiments
poly (3-hydroxybutyrate)
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Summary:Blends of PHB and LDPE were prepared by melt mixing in a twin screw extruder. Castor oil cake (CC) was used as filler for the blends. The design of experiments (DOE) technique was used to evaluate the effect of the components proportion on the materials properties. The mechanical properties and morphology of the materials were evaluated. The LDPE Young's modulus increases but the other tensile properties and impact resistance deteriorate with the addition of PHB or CC. The tensile strength values of binary mixtures of LDPE lie in the range from 8.9 to 10 MPa. As some commercial grades of LDPE have mechanical strength in this range, it may be inferred that the addition of a certain amount of PHB or CC to LDPE may be considered as a possibility for obtaining LDPE based materials with increased susceptibility to biodegradation. The poor interfacial adhesion between the phases became visible in all samples.
ISSN:1516-1439
1980-5373
1980-5373
DOI:10.1590/S1516-14392013005000196