Improvement of Interfacial Adhesion between Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) and Silica Particles

Abstract

To improve the mechanical properties of biodegradable bioplastic poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBH), a filler made up of silica particles (SiO 2 ) is mixed with PHBH; however, SiO 2 shows low compatibility with PHBH. Herein, to enhance the interfacial adhesion of SiO 2 and PHBH, the PHBH-grafted SiO 2 (SiO 2 −PHBH) fillers were prepared from propargyl-terminated PHBH and azide-modified SiO 2 by click chemistry. Scanning electron microscopy revealed that SiO 2 −PHBH fillers dispersed uniformly in PHBH. In contrast, the SiO 2 fillers aggregated in PHBH. Thermal analysis of the PHBH/SiO 2 −PHBH composite films revealed that the glass transition temperature shifted to a high temperature. Young's modulus and yield stress of the PHBH/SiO 2 −PHBH composite films were increased with increasing concentration of SiO 2 −PHBH. Conversely, PHBH/SiO 2 composite films showed only a small increase in the elastic modulus and a decrease in the yield stress. These results confirmed that SiO 2 −PHBH improves the mechanical properties of PHBH, and it is expected to expand the industrial applications of PHBH.

A Review on Biological Synthesis of the Biodegradable Polymers Polyhydroxyalkanoates and the Development of Multiple Applications

“…The tensile strength, storage modulus at room temperature improved by 60% and 140%, respectively, and it is suggested to have the potential for food packaging applications [243]. Other biobased inorganic fillers like silicon dioxide (SiO 2 ) [244], titanium dioxide (TiO 2 ) [245], calcium carbonate (CaCO 3 ) [246], polyhedral oligomeric silsesquioxane (POSS) [247] etc. have great potential for improvement in multiple properties of PHA based composites.…”

Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBH): Synthesis, properties, and applications - A review

“…Few studies have also explored the thermal, crystallization, mechanical, and morphological properties of PHBH nanosilica nanocomposites [149][150][151][152]. It has been reported that the degradation onset temperature of pure PHBH was increased with the addition of nanosilica.…”

Cell Trapping via Migratory Inhibition within Density-Tuned Electrospun Nanofibers

“…PHBH was utilized as the nanofiber matrix in the present study owing to its high biodegradability and biocompatibility. , The PHBH-aligned nanofibers with different densities were designed by mimicking the anisotropic topography of white matter, and they facilitated directional migration. The aligned nanofibers with different fiber densities were obtained via electrospinning onto the rotating collector for different spinning times (EST 20, EST 40, and EST 60).…”