Interface Modification, Water Absorption Behaviour and Mechanical Properties of Injection Moulded Short Hemp Fiber-Reinforced Thermoplastic Composites

Manaia, João P.; Manaia, A.

doi:10.3390/polym13101638

Cited by 19 publications

(20 citation statements)

References 47 publications

(80 reference statements)

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“…When the concentration of ODA was 0.5 g/L, the composites had the highest interfacial bonding strength and the strongest restraining effect on water absorption and swelling of fiber, 51,52 thus the water absorption of composites was lowest. Then, as the concentration of ODA increased, the trend of decrease after an increase in water absorption might be related to the interfacial water absorption due to the capillary effect 53–55 . Specifically, with the increase of ODA concentration, the excessive ODA led to a decrease in the interfacial binding between the fiber and PP, which weakened the restraining effect on interfacial water absorption.…”

Section: Resultsmentioning

confidence: 99%

“…Then, as the concentration of ODA increased, the trend of decrease after an increase in water absorption might be related to the interfacial water absorption due to the capillary effect. [53][54][55] Specifically, with the increase of ODA concentration, the excessive ODA led to a decrease in the interfacial binding between the fiber and PP, which weakened the restraining effect on interfacial water absorption. Therefore, the water absorption of composites was dominated by the capillary effect, and the water absorption increased slightly.…”

Section: Water Absorption Of Compositesmentioning

confidence: 99%

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Study on water absorption of hydrophobically modified ramie fiber and the reinforced polypropylene composites

Kang

Han

Wang

et al. 2023

J of Applied Polymer Sci

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To study the effects of fiber surface hydrophobicity on water absorption of composites, ramie fiber was hydrophobically modified with polydopamine/ octadecylamine and then used to reinforce polypropylene. The fiber modification was characterized by infrared spectroscopy, scanning electron microscopy, energy spectrometry, contact angle, and water absorption. The mechanical properties and water absorption of the composites were also characterized.The results indicated that polydopamine/octadecylamine was successfully grafted onto the fiber surface. With the increase of octadecylamine concentration, the fiber surface became more and more hydrophobic, and its contact angle achieved a maximum of 118 ± 2.97 when octadecylamine concentration was 8 g/L. However, the modified fiber remained a high level of saturated water absorption of 6.53% ± 0.09%. For composites, when the octadecylamine concentration was 0.5 g/L, its water absorption showed the lowest value of 1.81% ± 0.09%. With more octadecylamine was grafted onto the fiber, the water absorption did not decrease continuously but showed a small growth peak. It is concluded that water absorption of composites is greatly affected by water absorption of fiber. The surface hydrophobic modification on fiber is beneficial to improve its surface hydrophobicity and inhibit the interfacial water absorption between fiber and matrix. However, it fails to the improve internal hydrophobicity of the fiber, nor does it inhibit the fiber in composites from absorbing water.

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Section: Resultsmentioning

confidence: 99%

Section: Water Absorption Of Compositesmentioning

confidence: 99%

Study on water absorption of hydrophobically modified ramie fiber and the reinforced polypropylene composites

Kang

Han

Wang

et al. 2023

J of Applied Polymer Sci

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“…Normally in short fiber filled polymers, high content of fibers is utilized, thus finding fibers in membrane's cross section is an easy task. [ 39,40 ] In our prepared membranes only up to 5 wt% microsize short fibers were used. In such composites, finding suitable dispersion of short fibers is difficult. However, presence of short fibers in the cross section of the membranes is shown in Figure 2h,i.…”

Section: Resultsmentioning

confidence: 99%

Super Proton Conductive Nafion/Short Fiber/Nanosilica/Deep Eutectic Solvent (DES) Composite Membrane for Application in Anhydrous Fuel Cells

Karimi

Mohammadi

Hooshyari

et al. 2022

Macro Materials & Eng

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The aim of present study is to reduce the tortuosity of proton conductive pathways within the polymer electrolyte membranes (PEMs) for application in anhydrous PEM fuel cells. For this purpose, for the first time, microsize chopped fibers (modified glass wool fibers), modified nanosilica, and a deep eutectic solvent (DES) are incorporated into the Nafion matrix to extend proton conductive pathways. The long length of the fibers as new and cheap additives creates a continuous interface within the polymer matrix which significantly improves its proton conductivity, likely by reducing the tortuosity of proton conductive pathways. While nanosilica promotes the connectivity of the short fibers, EG/NaBr-based DES is also used as a nonaqueous electrolyte to maintain proton conductivity at anhydrous conditions. The measurements show super proton conductivity beyond 1400 mS cm −1 at 100 °C and anhydrous conditions for the Nafion/DES composite membrane containing 5 wt% short fibers and 2 wt% nanosilica. Furthermore, fuel cell performance of the prepared membranes shows a promising result by providing a maximum power density of 715 mW cm −2 at 95 °C. This study clearly shows the important role of ionic paths within the PEMs to achieve desirable properties in the real condition of a fuel cell system.

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“…From the torque curve in Figure 6b, the highest loading torque value of 60.4 N•m was obtained when rice husk was added to the rHDPE matrix. With the addition of this filler, the initial mobility of the polyethylene chains appeared to be limited, increasing the initial fusion torque [40]. Even so, the reinforced composites presented lower shear viscosity when they reached a molten state at about 23 N•m by the end of the test.…”

Section: Torque Rheometry and Processability Analysismentioning

confidence: 97%

Processability and Physical Properties of Compatibilized Recycled HDPE/Rice Husk Biocomposites

Rigail-Cedeño

Lazo

Gaona

et al. 2022

JMMP

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The circular economy promotes plastic recycling, waste minimization, and sustainable materials. Hence, the use of agricultural waste and recycled plastics is an eco-friendly and economic outlook for developing eco-designed products. Moreover, new alternatives to reinforce recycled polyolefins and add value to agroindustrial byproducts are emerging to develop processable materials with reliable performance for industrial applications. In this study, post-consumer recycled high-density polyethylene (rHDPE) and ground rice husk (RH) of 20% w/w were blended in a torque rheometer with or without the following coupling agents: (i) maleic anhydride grafted polymer (MAEO) 5% w/w, (ii) neoalkoxy titanate (NAT) 1.5% w/w, and (iii) ethylene–glycidyl methacrylate copolymer (EGMA) 5% w/w. In terms of processability, the addition of RH decreased the specific energy consumption in the torque experiments with or without additives compared to neat rHDPE. Furthermore, the time to reach thermal stability in the extrusion process was improved with EGMA and MAEO compatibilizers. Tensile and impact test results showed that using coupling agents enhanced the properties of the RH composites. On the other hand, thermal properties analyzed through differential scanning calorimetry and thermogravimetric analysis showed no significant variation for all composites. The morphology of the tensile fracture surfaces was observed via scanning electron microscopy. The results show that these recycled composites are feasible for manufacturing products when an appropriate compatibilizer is used.

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Interface Modification, Water Absorption Behaviour and Mechanical Properties of Injection Moulded Short Hemp Fiber-Reinforced Thermoplastic Composites

Cited by 19 publications

References 47 publications

Study on water absorption of hydrophobically modified ramie fiber and the reinforced polypropylene composites

Study on water absorption of hydrophobically modified ramie fiber and the reinforced polypropylene composites

Super Proton Conductive Nafion/Short Fiber/Nanosilica/Deep Eutectic Solvent (DES) Composite Membrane for Application in Anhydrous Fuel Cells

Processability and Physical Properties of Compatibilized Recycled HDPE/Rice Husk Biocomposites

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