Particles of Coffee Wastes as Reinforcement in Polyhydroxybutyrate (PHB) Based Composites

Abstract

The objective of the present study was to evaluate lignocellulosic particles from sub-products of the coffee industry (coffee parchment -CP and husk -CH) into polyhydroxybutyrate (PHB) as a promising reinforcing filler in the biocomposites. The effects of type (CP or CH) and content (neat, 10% and 20%) of coffee wastes on the thermal, mechanical, microstructural and physical properties of the ensuing composites were evaluated. Thermal stability of the composites was improved by the coffee residues at different contents, while degree of crystallinity was decreased with the inclusion of CP. The addition of 10% of CP has not influenced significantly the tensile strength (TS) and Izod strength (IS), in relation to the neat PHB. Tensile strength (TS), MOE and Izod strength (IS) of the composites have increased significantly with the inclusion of 20% of CP. The increase in the content of coffee waste particles increased the water absorption of the composites.

Effect of the wine wastes on the thermal stability, mechanical properties, and biodegradation's rate of poly(3‐hydroxybutyrate)

“…This has been done in order to collect experimental evidences concerning the relation between mechanical properties, thermal stability, and biodegradation. In fact, despite different agroindustrial wastes have been tested as PHB fillers 8,12–15 and stabilizers, 16–21 evidences and explanation regarding how reinforcing fillers and, especially, natural stabilizers could affect the other PHB key‐properties, such as the biodegradation behavior, are scarcely present in the literature.…”

Effect of two different plasticizers on the properties of poly(3‐hydroxybutyrate) binary and ternary blends

“…6 PHB is produced on a large scale and as thermoplastic, it can be extruded, molded, and spun using conventional processing equipment. 11 In order to overcome the limitations in some properties of PHB, additives such as fillers [12][13][14][15] or plasticizers [16][17][18][19][20][21] can be used. 9,10 Because of these, this polymer is a suitable candidate for the production of biodegradable materials in different applications as films, fibers, and nonwovens, thermoformed and injection molded rigid products, etc.…”

Studies on Chemical IR Images of Poly(hydroxybutyrate–co–hydroxyhexanoate)/Poly(ethylene glycol) Blends and Two-Dimensional Correlation Spectroscopy

“…To improve the properties of PHB, many attempts have been studied by copolymerization [2,8,9,10,11,12] and blending [13,14,15] with the other polymers. The PHB-based copolymers have been extensively studied using infrared (IR) [16,17,18,19] and Raman [8,10,20] spectroscopies, wide-angle X-ray scattering (WAXS) [11,20,21], X-ray diffraction (XRD) [22,23], differential scanning calorimetry (DSC) [24,25], and so on.…”