Effect of polymer type on the properties of polypropylene composites with high loads of spent coffee grounds

Marques, Mariana; Gonçalves, Luis F.F.F.; Martins, Carla I.; Vale, Nuno; Duarte, F. M.

doi:10.1016/j.wasman.2022.10.009

Cited by 5 publications

(3 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the decline in observed in biocomposites at highest percentage, which decreased the impact values as the filler content increased to 7 wt% with spent coffee grounds filler, implies that the greater filler concentration resulted in diminished energy absorption capacity. The insufficient interfacial interaction at higher concentration between the microfiller of SCG and PHBV is responsible for the initiation and spread of micro‐cracks at the interface sections between the filler and matrix, particularly under impact conditions 49 …”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Enhancement of spent coffee grounds as biofiller in biodegradable polymer composite for sustainable packaging

Alharbi,

Bairwan,

Rizg

et al. 2024

Polymer Composites

View full text Add to dashboard Cite

This study explores the utilization of Spent Coffee Grounds (SCG), a residual product of the coffee industry, as a microfiller reinforcement in Poly‐3‐hydroxybutyrate‐co‐3‐hydroxyvalerate (PHBV) biopolymer composites at varying concentrations (1%, 3%, 5%, and 7%). Melt compounding via a twin‐screw extruder and subsequent compression molding were employed in the fabrication process. The SCG microfiller, with particle diameters ranging from 1.11 to 1.28 μm, exhibited a significant negative charge (zeta potential: −20 mV). Hydrophobicity increased up to 5% filler concentration, as indicated by higher water contact angles, but diminished at highest concentration likelihood of agglomeration of the spent coffee grounds within the biopolymer matrix. The addition of SCG enhanced overall mechanical properties, particularly at a 5% filler concentration. Field Emission Scanning Electron Microscopy (FE‐SEM) and Atomic Force Microscopy (AFM) confirmed the successful incorporation of SCG microfiller, improving structural characteristics. Schematic drawings illustrated the interphase bonding of microfiller and matrix. However, properties diminished at the highest filler content (7%) due to coffee grounds' agglomeration. Despite this, SCG incorporation enhanced functional properties, making the biopolymer composite a promising material for sustainable packaging and various applications.Highlights Enhancement of properties of spent coffee grounds in PHBV biocomposites. Characterization of Biocomposites for multifunctional properties. Fracture and 2D analysis of the tensile fractured surface of biocomposites. A promising material for sustainable and biodegradable packaging.

show abstract

Section: Resultsmentioning

confidence: 99%

“…The insufficient interfacial interaction at higher concentration between the microfiller of SCG and PHBV is responsible for the initiation and spread of micro-cracks at the interface sections between the filler and matrix, particularly under impact conditions. 49…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Enhancement of spent coffee grounds as biofiller in biodegradable polymer composite for sustainable packaging

Alharbi,

Bairwan,

Rizg

et al. 2024

Polymer Composites

View full text Add to dashboard Cite

show abstract

“…As a result, only the common thermoplastic polymers with low melting points such as polyethylene and polypropylene are used as the matrix materials. 11 Particularly in a polar/nonpolar system with low interfacial adhesion (e.g., PALF-PP matrix composites), the weak interface region of the polymer composite deteriorates the overall properties and therefore, the fibre-matrix interface should be improved. 12 Research on the interface between fibre and polymer matrix is a crucial aspect for understanding the mechanical performance of composites.…”

Section: Introductionmentioning

confidence: 99%

Studies on interfacial shear strength of pineapple leaf fibre from agro-waste reinforced polypropylene composites: Influence of fibre length and carding parameters

Rahman,

Rana,

Das

et al. 2023

Journal of Thermoplastic Composite Materials

View full text Add to dashboard Cite

This work investigates the potential utilisation of the agro-waste pineapple leaf fibre (PALF) as a green reinforcement in polypropylene (PP) composites. Generally, chemical treatment is used to clean the scratched PALF, and the effluents of those chemicals are discharged into nature. A new mechanical approach (carding) was used in this work to remove the remaining extraneous substances from the scratched and sun-dried PALF instead of using any chemical treatment. The percentage of sticky fibres and dust content decreased, and fibre breakage increased with the increasing number of carding passages. The individualized fibre properties were also influenced by the number of carding passages. The carding process reduced the diameter of PALF due to removal of extraneous materials. The tensile properties of raw PALF improved significantly until the fourth carding passage and further increase in the number of passages did not show any significant influence on the tenacity and modulus. Scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR) confirmed the elimination of hemicellulose along with other gummy and waxy substances from the individualized PALF due to the carding action. The crystallinity % also increased after the carding process due to the removal of amorphous substances. As the reinforcement-matrix interfacial shear strength (IFSS) strongly influences the physico-mechanical properties of composites, IFSS of carded PALF reinforced finer and coarser PP fibre micro-bonded composites was also studied using the single fibre pull-out test (SFPT). Among different composites, the fourth carding passed PALF-reinforced finer PP fibre micro-bonded composite showed the highest IFSS. Additionally, the load- extension curves and SEM images of the tensile pulled-out surface were investigated to study the interfacial adhesion between PALF and PP micro-droplets. The increased surface roughness of PALF due to the carding action resulted in an improvement in the IFSS of PALF-reinforced PP micro-bonded composites.

show abstract

Effect of Interfacial Bonding Characteristics on Fire Performance of Flax Fiber Reinforced Composites

Franco-Urquiza

2024

Composites Science and Technology

View full text Add to dashboard Cite

Effect of polymer type on the properties of polypropylene composites with high loads of spent coffee grounds

Cited by 5 publications

References 46 publications

Enhancement of spent coffee grounds as biofiller in biodegradable polymer composite for sustainable packaging

Enhancement of spent coffee grounds as biofiller in biodegradable polymer composite for sustainable packaging

Studies on interfacial shear strength of pineapple leaf fibre from agro-waste reinforced polypropylene composites: Influence of fibre length and carding parameters

Effect of Interfacial Bonding Characteristics on Fire Performance of Flax Fiber Reinforced Composites

Contact Info

Product

Resources

About