Modification of flax fiber surface and its compatibilization in polylactic acid/flax composites

Xia, Xuelian; Liu, Wentao; Zhou, Liyong; Hua, Z. Q.; Liu, Hao; He, Suqin

doi:10.1007/s13726-015-0395-3

Cited by 60 publications

(21 citation statements)

References 60 publications

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“…Flexural properties provide an indirect idea regarding interfacial and stiffness properties of composites [36]. Due to providing reduced pressure resulting in fracture or significant crack in composites leading to failure for less interfacial adhesion among fiber and reinforcement polymer [37]. Effect of flexural bending strength and modulus (MPa) of treated and untreated fibers mass contents of 30%, 40%, and 50% reinforced PLA biocomposites displayed in Figure 3.…”

Section: Flexural Strength and Modulusmentioning

confidence: 99%

Preparation and evaluation mechanical, chemical and thermal properties of hybrid jute and coir fibers reinforced bio-composites using poly-lactic acid and poly-caprolactone blends

Hossen

Feng

Yin

et al. 2020

Mater. Res. Express

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Green composites using thermoplastics and thermosets got immense popularity long back when it newly introduced to the industry due to diminishing reliance on oil-based or gasoline materials, which causes numerous environmental problems. In this paper, bio-composites mechanical, chemical, thermal, and degradation properties of hybrid jute and coir fibers reinforced polylactic acid (PLA) investigated. Throughout the fabrication procedure of biocomposites, jute, and coir fibers characterized into three different categories raw, alkali-peroxide, and alkali-silane combined chemical treatments followed a design containing in a total of ten optimized samples. Jute and coir fibers were mixed with a solution of polycaprolactone (PCL) for better fiber-matrix adhesion prior to fabrication. The mechanical properties of alkali-silane treated reinforced fibers biocomposites improved compared to untreated fibers, which exhibited for fiber contents 40% an increase of respectively 32.8% by tensile strength 25.95% by tensile modulus, 24.58% by flexural strength, 23.64% by flexural modulus, and 26.08% by impact strength. Besides, moisture absorption, thickness swelling, thermal stability (TG), and surface chemistry analysis (FTIR) properties investigated, according to fiber-matrix contents ratio, hot-pressing time, temperature, and pressure to identify the effect of biocomposites due to chemical treatments. Moreover, the fiber surface effect of chemical treatments and interfacial adhesion morphologies observed using SEM. Eventually, alkali-silane combined optimized samples demonstrated the most desirable result in every aspect. In addition, a 90 days burial degradation performed to see the degradation flow of the biocomposites.

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Section: Flexural Strength and Modulusmentioning

confidence: 99%

Preparation and evaluation mechanical, chemical and thermal properties of hybrid jute and coir fibers reinforced bio-composites using poly-lactic acid and poly-caprolactone blends

Hossen

Feng

Yin

et al. 2020

Mater. Res. Express

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“…However, its applications are limited by its slow crystallization speed and brittleness to some extent [3][4][5][6]. To overcome these disadvantages of PLA, many studies have shown that adding natural fiber such as flax, hemp, jute, and sisal is an effective, useful method to reinforce PLA [7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, in order to improve the interfacial bonding between polymer and natural fiber, a lot of treatments are made to modify the surface of the fiber such as alkali, bleaching, acetylation, and steaming. Alkali treatment is one of most widely used methods [10,[15][16][17][18][19]. In this process, the lignin, hemicelluloses, pectin, and other impurities in the fiber are dissolved, and the molecular orientation is improved due to a reduction of the rotation angle of the microfibers.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Thermal Properties of PLA Biocomposites Reinforced by Coir Fibers

Sun

Zhang

Liang

et al. 2017

International Journal of Polymer Science

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In this work, polylactic acid (PLA) biocomposites reinforced with short coir fibers were fabricated using a corotating twin-screw extruder and injection molding machine. Short coir fibers were treated by mixed solution including hydrogen peroxide and sodium hydroxide to improve the adhesion between fibers and PLA matrix. The effects of treated coir fiber content (1, 3, 5, and 7 wt%) on tensile, impact, thermal properties, and surface morphology of PLA biocomposites were investigated. The best impact strength results were obtained for 3 wt% PLA/treated coir fiber biocomposites, where the impact strength was increased by approximately 28% compared to the neat PLA. The tensile modulus of PLA biocomposites was increased by increasing the treated coir fiber content. These results were confirmed by morphological structure analysis. Differential scanning calorimetry (DSC) results demonstrated a minor effect of the treated coir fiber on thermal behavior of PLA resin. Thermogravimetry analysis (TGA) demonstrated that the thermal stability of the PLA/treated coir fiber biocomposites was reduced by the incorporation of treated coir fiber.

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“…Compared with DG1, the peak height of DG6 increased at 3427 cm − 1 , indicating an increase in hydrogen-bonded association -OH with cellulose, meaning an increase in the fiber water absorption. e main reasons for the increase of water absorption of the DG6 fiber are as follows: NaOH solution hydrolyzes the waxy layer on the surface of straw fibers into higher fatty acids and higher fatty alcohols and then destroys the waxy layer on the surface [50,51]; when the metal hydrated ions in the NaOH solution enter the cellulose and interact with hydrogen bonds on the cellulose chain, it destroys some crystalline region of cellulose, decreasing the crystallinity of cellulose [52,53]. On the other hand, the absorption peak of DG6 sees a significant increase at 2918 cm − 1 corresponding to DG1, but disappears at 1516 cm − 1 and 1242 cm − 1 and diminishes at 1057 cm − 1 , indicating that the content of cellulose increased, the content of lignin decreased, and the crystallinity of the fibers increased after modification with the NaOH solution.…”

Section: Effect Of Modification Methods On Chemical Structure Of Stramentioning

confidence: 99%

Effect of Straw Fiber Modification Methods on Compatibility between Straw Fibers and Cement-Based Materials

Jiang

Cui

et al. 2020

Advances in Civil Engineering

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To improve the utilization of crop straws as a resource and the compatibility between straw fibers and cement-based materials, the hydration of modified straw fiber cement-based composite (SFCC) was studied. e structural characteristic of SFCC was investigated by FTIR, SEM, and XRD. e results show that the setting time of several modified straw fiber SFCC pastes was shorter than that of the unmodified straw fiber SFCC paste, and the best method of fiber modification to improve the setting time of the SFCC paste is Na 2 O·nSiO 2 treatment. e recommended fiber modification method for improving the compatibility between straw fibers and cement-based materials is alkali modification, followed by pure acrylic emulsion modification and Na 2 O·nSiO 2 modification. To improve the strength of SFCC, the straw fiber should be modified by alkali, followed by pure acrylic emulsion and Na 2 O·nSiO 2 modification and the method of water modification is also recommended. e phase types and relative contents of crystalline hydration products mixed with the modified straw fiber SFCC are significantly higher than those of the unmodified fiber SFCC. e fiber treatment method that was most helpful to increase the structural density of hydrates of SFCC was alkali treatment and pure acrylic emulsion treatment, followed by Na 2 O·nSiO 2 treatment.

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Modification of flax fiber surface and its compatibilization in polylactic acid/flax composites

Cited by 60 publications

References 60 publications

Preparation and evaluation mechanical, chemical and thermal properties of hybrid jute and coir fibers reinforced bio-composites using poly-lactic acid and poly-caprolactone blends

Preparation and evaluation mechanical, chemical and thermal properties of hybrid jute and coir fibers reinforced bio-composites using poly-lactic acid and poly-caprolactone blends

Mechanical and Thermal Properties of PLA Biocomposites Reinforced by Coir Fibers

Effect of Straw Fiber Modification Methods on Compatibility between Straw Fibers and Cement-Based Materials

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