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- Title
Mechanical and thermal properties of spent coffee bean filler/poly(3-hydroxybutyrate-co-3-hydroxyvalerate) biocomposites: Effect of recycling.
- Authors
T, Senthil Muthu Kumar; Yorseng, Krittirash; N, Rajini; Siengchin, Suchart; Ayrilmis, Nadir; A, Varada Rajulu
- Abstract
• Eco-friendly composites were fabricated using PHBV as matrix and SCBP as filler. • Utilization of waste fillers for reduction in cost of the packaging products. • Biocomposites up to 15 wt.% SCBP had properties comparable to synthetic counterparts. • Effect of recycling of the biocomposites was also analyzed. Green composites were fabricated using poly(3-hydroxybutyrate- co -3-hydroxyvalerate) (PHBV) as the matrix and spent coffee bean powder (SCBP) as a filler by simple solution casting method. The effect of varying concentrations (5–25 wt.%) of SCBP on the thermal and mechanical properties was studied. The SCBP filler had better thermal properties than the matrix and the composites. There was slight increase in the glass transition temperature of the composites with higher concentration of the filler when compared to the PHBV matrix. The weight remaining at endset temperatures of the composites was found to be higher than for the matrix indicating enhanced thermal stability. The contact angle of the composites increased with increasing filler content changing from 75.8° to 97°. The tensile strength and modulus of the composite films reduced with increasing filler concentration but a reverse trend was observed in case of the % elongation at break. However, the tensile properties were comparable with other synthetic polymers such as LDPE, HDPE etc. Furthermore, the recycling of films did not significantly affect the mechanical and thermal properties. Hence, with comparable thermal and tensile properties, these biocomposite films can be considered for replacing the conventional synthetic non-biodegradable polymers such as polyethylene and polypropylene for packaging applications.
- Subjects
COFFEE beans; THERMAL properties; WASTE recycling; GLASS transition temperature; WASTE minimization; SYNTHETIC fibers
- Publication
Process Safety & Environmental Protection: Transactions of the Institution of Chemical Engineers Part B, 2019, Vol 124, p187
- ISSN
0957-5820
- Publication type
Article
- DOI
10.1016/j.psep.2019.02.008