Effect of starch addition on compression‐molded poly(3‐hydroxybutyrate)/starch blends

Abstract

Because of their biocompatibility and total biodegradability, poly(3-hydroxybutyrate) (PHB) and starch have attracted attention as promising raw materials for manufacture of single-use plastic items and biomaterials. PHB/ maize starch blends with starch contents in the range of 0 -50 wt % were processed in an internal mixer, and their compression-molded films were characterized by tensile tests, X-ray diffraction, thermogravimetric analysis, wettability measurements, and scanning electron microscopy. Water and glycerol were used as plasticizers. The results indicated that the thermal degradation behavior of the blends were similar to that of pure PHB films. All the blends showed heterogeneous morphology, wherein starch granules were dispersed in continuous PHB-rich matrix. Despite the decrease in elongation at break and tensile strength, starch incorporation of up to 30 wt % into PHB matrix resulted in materials as hard as pure PHB films, but exhibiting less crystallinity and more hydrophilic character, which might lead to a higher biodegradation rate.

Bacterial cellulose/poly(3-hydroxybutyrate) composite membranes

“…Broader peaks can be observed at 19.9 • , 21.5 • , 22.5 • , 25.5 • and 27.15 • . These diffraction lines can be attributed to the orthorhombic PHB lattice (Thiré, Ribeiro, & Andrade, 2006). Diffraction patterns obtained for the composite membranes show only the cellulose peaks with a decrease intensity for the peak at 15 • for compositions up to 50% PHB (Fig.…”

Microfibrillated cellulose and new nanocomposite materials: a review

“…Two main approaches have been applied to overcome these problems-blending or chemical modification. Starch can be blended with biodegradable polymers such as PHB (Lai et al 2006;Thire et al 2006), PLA (Jang et al 2007;Hao et al 2008;Ning et al 2008), PCL (Wang et al 2005;Rosa et al 2006;Kim et al 2007;Sarazin et al 2008) and chitosan (Xu et al 2005;Durango et al 2006;Nakamatsu et al 2006). Fabrication of composites based on organic or inorganic reinforcement is another possible solution to improve the performance of starch films.…”

Membranas de polihidroxibutirato com hidroxiapatita para utilização como biomaterial

“…Comportamentos similares foram relatados por Mendes [17] que constatou dois picos bem definidos de cristalinidade em torno de 2θ=13,2° e 2θ= 16,7°. Já Thire, Ribeiro e Andrade [18] obteve em seus resultados dois picos bem definidos de cristalinidade em torno de 2θ=13,6° e 2θ= 17,1° e célula unitária tipo ortorrômbica.…”