Mechanical Performance of Hemp Fiber Polypropylene Composites at Different Operating Temperatures

Tajvidi, Mehdi; Motie, Nazanin; Rassam, Ghonche; Falk, Robert H.; Felton, Colin

doi:10.1177/0731684408100266

Cited by 43 publications

(30 citation statements)

References 6 publications

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“…Polyethylene usually shows three relaxation peaks via DMA, namely α , β , and γ . The γ relaxation corresponds to the glass transition temperature ( T g ) of the polymer and is related to the amorphous phase, while the α relaxation is associated to chain segment mobility in the crystalline phase.…”

Section: Resultsmentioning

confidence: 98%

“…The γ relaxation corresponds to the glass transition temperature ( T g ) of the polymer and is related to the amorphous phase, while the α relaxation is associated to chain segment mobility in the crystalline phase. Finally, the β transition corresponds to the mobility of side branches . Previously, it was observed that LMDPE had two major transitions in its loss factor (tan δ ) curves, namely α and γ .…”

Section: Resultsmentioning

confidence: 99%

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Polymerization compounding of hemp fibers to improve the mechanical properties of linear medium density polyethylene composites

2017

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Improved mechanical properties play an important role allowing the expansion of natural fiber composites in automotive interior parts and construction industries. Unfortunately, their hydrophilic nature leads to incompatibility with hydrophobic matrices limiting their full potential. But this can be overcome by fiber surface modification. So the objective of this work was to modify hemp fibers by an advanced process called surface‐initiated catalytic polymerization and to evaluate its effect in terms of morphological, rheological, and mechanical properties for linear medium density polyethylene (LMDPE) composites. The results showed that catalytic polymerization of hemp fibers was successful as the fibers were coated with grafted polymer chains (polyethylene). This was confirmed by an increase of the C‐H and C‐C groups by FTIR on the fibers surface, as well as the presence of an extra peak in DTG curves between 400 and 500°C. This was also confirmed by SEM pictures and density change owing to the presence of these grafted PE molecules. The composites morphology (SEM) and mechanical properties in the solid (E' and tan δ) and melt (van Gurp‐Palmen plot, complex and transient viscosity, and activation energy) state showed that, the presence of PE molecules on the surface of treated hemp fibers led to a significant improvement of the fiber‐matrix interfacial quality producing significant increases of the composite's (30% wt.) Young's modulus (8%) and tensile strength (43%) with respect to the composite based on untreated fibers, which represents a 125% and 58% increases with respect to the neat polymer. POLYM. COMPOS., 39:2860–2870, 2018. © 2017 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Polymerization compounding of hemp fibers to improve the mechanical properties of linear medium density polyethylene composites

2017

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“…Therefore, the method of cellulose modification varies the final material properties to different extents. Lower values of storage and loss moduli might evidence the poor filler-polymer matrix interactions [104,105] and, therefore, the low modification yield.…”

Section: Dynamic Mechanical Analysismentioning

confidence: 99%

Cellulose Modification for Improved Compatibility with the Polymer Matrix: Mechanical Characterization of the Composite Material

Cichosz

Rylski

2020

Materials

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The following article is the presentation attempt of cellulose hybrid chemical modification approach as a useful tool in improving the mechanical properties of plant fiber-filled polymer materials. The treatment process is a prolonged method of the cellulose maleinization and consists of two steps: 1. solvent exchange (altering fiber structure); 2. maleic anhydride (MA) chemical grafting (surface modification). Thanks to the incorporated treatment method, the created ethylene–norbornene copolymer composite specimen exhibited an improved performance, tensile strength at the level of (38.8 ± 0.8) MPa and (510 ± 20)% elongation at break, which is higher than for neat polymer matrix and could not be achieved in the case of regular MA treatment. Moreover, both the Payne effect and filler efficiency factor indicate a possibility of the fiber reinforcing nature that is not a common result. Additionally, the polymer matrix employed in this research is widely known for its excellent resistance to aqueous and polar organic media, good biocompatibility, and the ability to reproduce fine structures which makes it an interesting material regarding healthcare applications. Therefore, plant fiber-based polymer materials described in this research might be potentially applied in this area, e.g., medical devices, drug delivery, wearables, pharmaceutical blisters, and trays.

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“…One of the most common experiments to characterize materials in mechanical properties is the three point bending test [17] . Different polymerization temperatures and fibers volume fraction GF/pCBT composite specimens were manufactured for measuring mechanical strength and the flexural tests according to ASTM-D790 were carried out using Instron 4505 electron universal testing machine at room temperature [18,19] .…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Influence of high temperature on the flexural properties of GF/pCBT laminates and their fusion-bonded joints

Zhang

Zhou

Zhang

et al. 2017

Composites Part B: Engineering

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The glass fiber reinforced poly cyclic butylene terephthalate(GF/pCBT) composite laminates and their fusion-bonded joints were prepared at appropriate polymerization temperature. The connection form of joints was designed and optimized. A series of bending test were conducted to research their mechanical behavior at different temperature. Experimental results showed that flexural properties of laminates and joints decreased as temperature increased. The temperature sensitivity of specimens change at a temperature between 50℃ to 75℃ as a result of the glass transition of the pCBT matrix. Moreover, the failure modes of GF/pCBT composite joints were investigated at room and high temperature. In addition, the specimens suffered by different high temperatures ranging from 25℃ to 200℃ were cooled and then tested at room temperature. The results indicated the flexural strength of laminates was nearly a constant after high temperature, and increased slightly when the temperature is higher than 175 ℃. The flexural strength of fusion-bonded joints was not affected after suffered high temperature.

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Mechanical Performance of Hemp Fiber Polypropylene Composites at Different Operating Temperatures

Cited by 43 publications

References 6 publications

Polymerization compounding of hemp fibers to improve the mechanical properties of linear medium density polyethylene composites

Polymerization compounding of hemp fibers to improve the mechanical properties of linear medium density polyethylene composites

Cellulose Modification for Improved Compatibility with the Polymer Matrix: Mechanical Characterization of the Composite Material

Influence of high temperature on the flexural properties of GF/pCBT laminates and their fusion-bonded joints

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