NDLI: Morphology and thermal degradation studies of melt-mixed poly(hydroxybutyrate-co-valerate) (PHBV)/poly(ε-caprolactone) (PCL) biodegradable polymer blend nanocomposites with TiO$

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Morphology and thermal degradation studies of melt-mixed poly(hydroxybutyrate-co-valerate) (PHBV)/poly(ε-caprolactone) (PCL) biodegradable polymer blend nanocomposites with TiO$_{2}$ as filler

Content Provider	Springer Nature Link
Author	Mofokeng, J. P. Luyt, A. S.
Copyright Year	2015
Abstract	The morphology, thermal stability and thermal degradation kinetics of melt-mixed poly(hydroxybutyrate-co-valerate) (PHBV)/poly(ε-caprolactone) (PCL) blends filled with small amounts of titanium(IV)oxide (TiO$_{2}$) nanoparticles were investigated. The nanoparticles were mostly well dispersed in both phases of the PHBV/PCL blend, which showed a co-continuous morphology at a 50/50 w/w ratio, but some large agglomerates were also observed. The equal dispersion of the TiO$_{2}$ nanoparticles in both polymers was attributed to the polymers having the same surface properties, polarities and viscosities. The thermal stability of PHBV was improved when blended with the more thermally stable PCL, but the PCL became less thermally stable when blended with PHBV. The introduction of only 1 wt% of TiO$_{2}$ nanoparticles seems to have observably improved the thermal stabilities of both polymers in the blend, but the nanoparticles probably retarded the evolution of the degradation products through their interaction with these products. Further improvement in thermal stability at higher nanoparticle contents was insignificant because of the nanoparticles’ agglomeration which reduced their effectiveness. Changes in the activation energies of degradation, determined through the Flynn–Wall–Ozawa model from thermogravimetric analysis mass loss data, and differences between the Fourier-transform infrared spectra of the degradation volatiles obtained during the degradation process, to a large extent support the other observations.
Starting Page	3812
Ending Page	3824
Page Count	13
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	50
Issue Number	10
e-ISSN	15734803
Language	English
Publisher	Springer US
Publisher Date	2015-03-11
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Materials Science Characterization and Evaluation of Materials Polymer Sciences Continuum Mechanics and Mechanics of Materials Crystallography Mechanics
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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