Abstract
Poly(hydroxybutyrate-co-hydroxyvalerate)(PHBV) biocomposites containing of sisal fibers and clay particles were prepared by solution casting technique. Silane (Bis(triethoxysilylpropyl)-tetrasulfide) treatment has been used to modify surface of sisal fiber and enhance the properties of related PHBV composites. The mechanical and thermal properties of the PHBV composites were determined in uniaxial tensile, dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC), respectively. The dispersion of the sisal fiber and clay in the PHBV was studied by scanning electron microscopy (SEM). All PHBV based composites were subject to water absorption. It was found that the tensile and storage modulus of PHBV/5 wt.% sisal composites was improved by maximum 7 % and 10 % respectively. Treated silane of sisal fiber at 5 wt.% was found to enhance tensile modulus by 12 % as compared to the neat PHBV. In corporation of 3 wt.% clay in PHBV matrix increased the tensile and storage modulus by 8 % and 16 % respectively, compared to the neat PHBV. Note that this feature was also confirmed by SEM. Moreover, water uptake and the diffusion coefficient of the PHBV composites systems studied was also calculated.
Highlights
In the recent year, the aim to solve the environmental problem caused by the disposal of large volumes of conventional petroleum based plastics became to develop an increasing number of biodegradable polymer [1]
4 Conclusions The objective of this work was to study the effect of proportions of sisal fibers-reinforced PHBV composites and hybrid with addition of clay nanoparticles on mechanical, thermal properties and morphology
The preliminary results showed that, the highest value of tensile modulus was found at PHBV with 5 wt.% sisal fiber which increased by 8 % compared with the neat PHBV
Summary
The aim to solve the environmental problem caused by the disposal of large volumes of conventional petroleum based plastics became to develop an increasing number of biodegradable polymer [1]. Biodegradable polymer-based packing materials are needed, especially those used for packing and disposable applications [2]. Among the various available biodegradable polymers such as PLA, PHB and PHBV have be used for bio-based polymer composites. It was recognized earlier that the natural fibers reinforcement of these biodegradable polymers might be considered an effective way to improve of these mechanical properties. Natural fibers exhibit advantageous properties as reinforcement for composites. The density of fibers is low which can be great benefit for the lightweight construction. Major benefit of the solution technique, covering the casting solution method is widely used for dispersion of the particles and modified fiber and polymer matrix. HouYong Yu et al [2] reported on PHBV reinforced with PHBVgrafted multi-walled carbon nanotubes (PHBV-g-MWCNTs)
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