Mechanical and thermal properties of recycled polyethylene/surface treated hemp fiber bio‐composites

Güney, Olcay; Bilici, İbrahim; Doğan, Deniz; Metin, Ayşegül Ülkü

doi:10.1002/pc.27463

Cited by 12 publications

(2 citation statements)

References 102 publications

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“…The mechanical energy input required to obtain the mixtures increases as the torque increases. The temperature during obtaining the mixtures decreases initially as a result of the introduction of the ingredients at room temperature in the mixer, after which it increases due to the temperature in the mixing chamber (150 • C) as well as due to the increase in the shear moment, the effect being reported previously [41]. The resulting mixtures were used to make plates by compression moulding, using specific moulds and the laboratory electrical press (Fortune Presses model no.…”

Section: Obtaining Mixtures and Test Samplesmentioning

confidence: 99%

Obtaining and Characterizing New Types of Materials Based on Low-Density Polyethylene and Thermoplastic Starch

Stelescu,

Oprea,

Motelica

et al. 2024

J. Compos. Sci.

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Significant interest is devoted to the development of new polymer blends by using concepts of the circular economy. Such materials have predetermined properties, are easy to recycle, ecological, and have a low carbon footprint. This research presents obtaining and characterization of polymer blends based on low-density polyethylene (LDPE) and thermoplastic starch (TPS). In the first stage, TPS was obtained through the gelatinization process, and, in the second stage, mixtures of LDPE and TPS were obtained through a melt mixing process at 150 °C for 7 min. The physical–mechanical characteristics of the samples, like hardness, elongation at break, rebound resilience, and tensile strength, were determined. The sample containing maleic anhydride grafted low-density polyethylene (LDPE-g-MA) as a compatibilizer shows improvements in elongation at break and tensile strength (by 6.59% and 40.47%, respectively) compared to the test sample. The FTIR microscopy maps show that samples containing LDPE-g-MA are more homogeneous. The SEM micrographs indicate that TPS-s is homogeneously dispersed as droplets in the LDPE matrix. From the thermal analysis, it was observed that both the degree of crystallinity and the mass loss at high temperature are influenced by the composition of the samples. The melt flow index has adequate values, indicating good processability of the samples by specific methods (such as extrusion or injection).

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Section: Obtaining Mixtures and Test Samplesmentioning

confidence: 99%

Obtaining and Characterizing New Types of Materials Based on Low-Density Polyethylene and Thermoplastic Starch

Stelescu,

Oprea,

Motelica

et al. 2024

J. Compos. Sci.

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“…The captured peaks were utilized to analyze crystallographic properties. Using Segal's formula (equation ) and Scherer's relation (equation ), CI and CS are calculated 30–32

CI = (\frac{I_{200} - I_{am}}{I_{200}}) \times 100 %,

CS = \frac{italicKλ}{β \cos θ},

where I 200 is crystalline peak intensity, I am is amorphous peak intensity, θ is the diffraction angle, k is 0.89 (Scherrer's constant), ß is the peak's full width at half‐height, and λ is the radiation wavelength.…”

Section: Fiber Extraction Modification and Characterizationmentioning

confidence: 99%

Enhancing properties and sustainability: Surface modified Cymbopogon flexuosus stem fiber for green composite materials

Somasundaram,

Ananchaperumal

et al. 2023

Polymer Composites

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The lignocellulosic fiber has distinct capacities and properties from diverse perspectives. As there is a crucial need for the development of green products, many industries are racing to identify potential fibers for their products. This work focuses first on the property enhancement using chemical modification techniques for Cymbopogon flexuosus stem fiber (CFS), which is extracted from the waste residue of an oil industry. The chemically treated fibers resulted in higher cellulose (77.35%) and lower hemicellulose‐lignin contents (8.36% and 14.5%), which favors composite manufacturing. Morphological analysis on the fiber surface through scanning electron microscope (SEM) and atomic force microscope (AFM) evidenced the surface was rough, and a single fiber tensile test reveals an average tensile strength of 635 ± 4.5 MPa. Further x‐ray diffraction examination verified the existence of semi‐crystalline cellulose with a size of 14.32 nm and a higher crystallinity index of 55.17%. Secondly, to explore fiber prospective qualities against the commercially available bio‐composite, epoxy resin‐based composites were prepared by varying the weight and length of fiber reinforced. The surface‐modified CFS epoxy composite has the highest tensile strength (77.71 MPa), tensile modulus (5.26 Gpa), flexural strength (87.4 MPa), flexural modulus (1.85 GPa), hardness (64 HRRW), and impact strength (9.31 J/cm2). The thermogravimetric analyses were evaluated to assess their weight loss under heat influence. Tensile fractography was also investigated to establish the structure–property relationship between the composite and fiber. Thus, unique fiber was identified as an ecologically benign and economically viable raw material to build lightweight green materials for industrial applications.Highlights Studies explores the potential of CFSF, which is typically an industrial waste. Chemical modification reveals the enhancement of properties. Identifies optimum parameters that enhance composite properties. This aligns with the broader trend of sustainable and green manufacturing.

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Development of biodegradable filaments based on agro‐industrial waste and evaluation of process parameters in final properties

da Silva Fortes,

de Abreu,

de Sousa Nascimento Junior

et al. 2023

Polymer Composites

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Additive manufacturing, which has become popular in recent years, is the process of joining materials through the deposition of layers to form parts based on data from a 3D model and fused deposition modeling. The search for biodegradable materials for the production of filaments for 3D printing is increasing and opening up possibilities for the development of new sustainable products, including the use of lignocellulosic waste in the formulation. Therefore, the present work aims to develop polymeric filaments based on polybutylene adipate terephthalate and low content (2.5 and 5 wt%) of peanut and soybean shells and evaluate their potential for 3D printing. The charges were characterized in terms of chemical composition. Tensile and dimensional variation tests were performed on samples manufactured from two different filling orientations: −45/45° and 0/90°. The printability of the filament was based on the manufacture of prototypes of agricultural tubes that were also characterized by thermogravimetry and their morphology through scanning electron and optical microscopy. Both natural residues significantly (p < 0.05) affected the sample dimensions and mechanical properties. However, the filling orientation difference was insignificant (p > 0.05). The filaments produced showed good processability, thermal and dimensional stability. The samples produced showed a satisfactory surface finish without exposing load agglomerates. These results demonstrate the feasibility of using lignocellulosic fillers, such as peanut and soybean shells, in additive manufacturing and indicate the possibility of producing parts with varied geometries.Highlights Use of lignocellulosic residues in biodegradable filaments. The filament produced with fillers of peanut and soybean shells showed good processability. Filament fracture depends on the raster angle. It was possible to produce tubes with good surface quality and mechanical properties.

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Mechanical and thermal properties of recycled polyethylene/surface treated hemp fiber bio‐composites

Cited by 12 publications

References 102 publications

Obtaining and Characterizing New Types of Materials Based on Low-Density Polyethylene and Thermoplastic Starch

Obtaining and Characterizing New Types of Materials Based on Low-Density Polyethylene and Thermoplastic Starch

Enhancing properties and sustainability: Surface modified Cymbopogon flexuosus stem fiber for green composite materials

Development of biodegradable filaments based on agro‐industrial waste and evaluation of process parameters in final properties

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