Cellulose fiber-reinforced high-density polyethylene composites—Mechanical and thermal properties

Mulinari, Daniella Regina; Voorwald, Herman Jacobus Cornelis; Cioffi, Maria Odila Hilário; Silva, Maria Lúcia Caetano Pinto da

doi:10.1177/0021998316665241

Cited by 39 publications

(20 citation statements)

References 29 publications

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“…Theses longitudinal fibres of the composites, oriented transversely to the direction of the impact pendulum, may realize friction in the matrix and dampen a greater amount of energy. According to Mulinari et al [35], brittle behavior of fibres can limit the plasticity behavior of the composites because of mechanical friction process, resulting in the fibre pull-out from the matrix. Zhao et al…”

Section: Fracture Analysis Of the Compositesmentioning

confidence: 99%

Mechanical Behaviour of a Green Composite from Biopolymers Reinforced with Sisal Fibres

et al. 2020

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In recent years, green composites based on thermoplastic matrices from renewable sources, and reinforced with natural fibres, have gained significant importance in different industrial applications, due to lower environmental impacts and production costs than traditional composites. This work investigates the manufacturing process, fibre/matrix integration and mechanical properties of a novel environmentally friendly green composite with a recyclable biobased polymer from a renewable source and a biodegradable natural fibre. Untreated woven sisal fibres reinforced post-consumer green polyethylene composites were evaluated in terms of flexural, tensile and impact properties. Traditional and green high-density polyethylene (HDPE), originated from sugarcane ethanol, were utilised as matrices of the investigated composites. Woven sisal fibres were arranged in two different stacking sequences, i.e. [0°/90°] and [± 45°], being incorporated into the HDPE with a mass percentage proportion of 30/70 (fibre/matrix). A low-cost manufacturing process based on the hot compression moulding was used to produce the composites. The results were analysed by a factorial design to identify the effects of polyethylene type and the use of woven sisal fibres, considering the [0°/90°] and [± 45°] orientations. Thermal gravimetric analysis was used to verify the thermal stability of the sisal fibre. The topographic surface of sisal fibres was observed by scanning electron microscopy. The results showed that the use of green polyethylene reinforced with untreated woven sisal fibres achieved higher flexural modulus (35%), flexural strength (13%), tensile strength (39%) and ultimate strain (68%) than traditional polyethylene without reinforcement. The green composite presented promising mechanical results to replace materials from non-renewable sources and can reduce manufacturing costs of the final product. These composite materials can be efficient for structural applications such as insulated panels, drywall and partitions for furniture.

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Section: Fracture Analysis Of the Compositesmentioning

confidence: 99%

Mechanical Behaviour of a Green Composite from Biopolymers Reinforced with Sisal Fibres

et al. 2020

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“…7 This materials class has been used in different areas, such as in architectural material and automotive industry. 8…”

Section: Introductionmentioning

confidence: 99%

Revaluation of Australian palm residues in polypropylene composites: Statistical influence of fiber treatment

Zanini

Barbosa

Souza

et al. 2020

Journal of Composite Materials

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Australian palm residues are generated by palm heart industry in large quantities and are considered an underused material with a composition rich in lignocellulosic structures. This residue is generally utilized as briquettes for energy or sheep feed; however, few works investigate this residue as composite fillers. This work aimed to revalue Australian palm residues (PR) by preparing polypropylene composites through melt mixing, using different fiber contents (0, 5, 10, 20, and 30 wt%), and evaluate the statistical influence of fibers (residues) alkali treatment (MPR) in composites mechanical properties. PR and MPR were evaluated by FTIR, XRD, SEM, TGA, and composites were assessed using thermal and mechanical analysis, in which ANOVA statistical analysis was applied. The residues addition increased the mechanical properties and their treatment enhanced the stiffness of the composites compared to pristine PP. However, ANOVA demonstrated that at low residues contents, surface treatment does not increase fiber-matrix interactions effectively, then tensile properties were statistically similar to PP. Considering tensile properties, 20% MPR showed statistically distinct properties, with significative enhancements; no filler contents dependence was verified. Flexural properties were more sensitive to residue loading, and composites with 30% PR and MPR presented superior mechanical performance. This difference is associated with a higher sensitivity of tensile stress towards fiber-matrix interactions, which was improved with fiber treatment. Also, the residues content and treatment influenced the composites' thermal stability, with better results for PP-MPR. Results indicate that palm residue is an excellent filler for improving composites' thermal and mechanical properties, with a greener character.

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“…The absorption bands at approximately 1638 cm -1 and 3430 cm -1 were assigned to the vibrations of water molecules (Ramandi et al 2017). The absorption peaks at 1732 cm -1 and 2885 cm -1 , i.e., the characteristics of unconjugated CO groups and symmetrical CH groups in hemicelluloses, showed a decreased intensity, which indicated that the hemicelluloses were partly degraded during the in situ process (Mulinari et al 2016). To further clarify the compositions of the iron oxide compounds and copper film, the high-resolution XPS spectra of Fe 2p, O 1s, and Cu 2p3/2 were measured (Figs.…”

Section: Characterizations Via Sem Eds Xrd Ftir and Xpsmentioning

confidence: 99%

Natural fiber-based composites with high hydrophobic, magnetic, and EMI shielding properties via iron oxide in situ synthesis and copper film deposition

Wang

Tang

Xiao

et al. 2020

BioRes

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A sandwich-structured natural fiber-based magnetic composite, without the use of a binder, was developed in this study. It was fabricated via in situ synthesis, densification, and magnetron sputtering processes. The chemical composition, crystal structure, microstructure, and thermal stability were characterized via X-ray photoelectron spectroscopy, energy-dispersive spectroscopy, X-ray diffraction, scanning electron microscope, and thermogravimetric analysis. The hydrophobic, magnetic, and electromagnetic interference shielding properties were investigated by measuring the static water contact angle, the magnetic hysteresis loops, and the shielding effectiveness. The resulted composites exhibited a unique inner structure with a larger iron oxide size and content (492 nm and 26.1 wt%) on the interlayer surface in comparison to the core layer (135 nm and 18.7 wt%). The magnetic response can be controlled by the loaded iron oxide content and the copper film deposition. Sputtering copper film changed the surface free energy, and created rough micro-/nanostructures, which yielded a highly hydrophobic nature (133° in water contact angle), and approximately 99.2% of the electromagnetic energy was shielded by the 0.8 mm thick composite.

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Cellulose fiber-reinforced high-density polyethylene composites—Mechanical and thermal properties

Cited by 39 publications

References 29 publications

Mechanical Behaviour of a Green Composite from Biopolymers Reinforced with Sisal Fibres

Mechanical Behaviour of a Green Composite from Biopolymers Reinforced with Sisal Fibres

Revaluation of Australian palm residues in polypropylene composites: Statistical influence of fiber treatment

Natural fiber-based composites with high hydrophobic, magnetic, and EMI shielding properties via iron oxide in situ synthesis and copper film deposition

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