Effect of Hydrothermal Aging on Injection Molded Short Jute Fiber Reinforced Poly(Lactic Acid) (PLA) Composites

Jiang, Ning; Yu, Tao; Li, Yan

doi:10.1007/s10924-018-1205-8

Cited by 43 publications

(35 citation statements)

References 45 publications

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“…Moisture absorption and water intake under environmental exposure are the main factors whose evolution can significantly drop the mechanical properties of composites [131,132]. Natural fibers have high affinity towards moisture (Table 3) and might swell during ageing or weathering, the dimensional changes leading to swelling stress, with the formation of cracks that can advance up to integrity failure [133]. On the other hand, moisture entering the material through fibers acts as plasticizer of polymer matrix, weakening the interfacial bond with the filler, which, again, can generate and propagate cracks [134,135].…”

Section: Weathering and Accelerated Ageing Of Polymer Composites Withmentioning

confidence: 99%

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Environmental Degradation of Plastic Composites with Natural Fillers—A Review

Brebu¹

2020

Polymers

153

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Polymer composites are widely used modern-day materials, specially designed to combine good mechanical properties and low density, resulting in a high tensile strength-to-weight ratio. However, materials for outdoor use suffer from the negative effects of environmental factors, loosing properties in various degrees. In particular, natural fillers (particulates or fibers) or components induce biodegradability in the otherwise bio inert matrix of usual commodity plastics. Here we present some aspects found in recent literature related to the effect of aggressive factors such as temperature, mechanical forces, solar radiation, humidity, and biological attack on the properties of plastic composites containing natural fillers.

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Section: Weathering and Accelerated Ageing Of Polymer Composites Withmentioning

confidence: 99%

“…Equilibrium moisture content (EMC) of several natural fibers at 21 • C and 65% RH. Reprinted with permission from[133].…”

mentioning

confidence: 99%

Environmental Degradation of Plastic Composites with Natural Fillers—A Review

Brebu¹

2020

Polymers

153

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“…Hydrolysis is one of the main characteristics of PLA. The hydrolysable functional groups in their backbone are susceptible to chemical degradation by water . The hydrolysis of PLA can be greatly influenced by different environment, including humidity, neutral solution, acid solution, alkaline solution, saline solution, and temperature .…”

Section: Introductionmentioning

confidence: 99%

“…The hydrolysable functional groups in their backbone are susceptible to chemical degradation by water. [11][12][13] The hydrolysis of PLA can be greatly influenced by different environment, including humidity, neutral solution, acid solution, alkaline solution, saline solution, and temperature. [14] In other words, the rate and mechanism of hydrolysis of PLA are governed by the diffusion of water and the concentration of OH − and H + ions which can catalyze the hydrolysis of ester bonds of PLA.…”

Section: Introductionmentioning

confidence: 99%

Effect of saline and alkaline solution aging on the properties of jute/poly(lactic acid) composites

Jiang

et al. 2019

Polymer Composites

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In this paper, jute/PLA composites were prepared by using twin‐screw extrusion, and injection molding with weight percent of jute fibers was 10%. A saline solution (pH = 7.48 ± 0.1) was prepared adding 0.05 g/mL of sodium chloride. A solution of NaOH with pH = 8.53 ± 0.1 was also prepared. Its water absorption, pH value, and mechanical properties were measured and differential scanning calorimetry, gel permeation chromatography, scanning electron microscopy were performed to analyze the aging mechanism of jute/PLA composite in saline and alkaline solution at 23°C. The results showed that the weight gain for jute/PLA composite immersed in alkaline solution was higher than that immersed in saline solution. The pH of alkaline solution declined faster than saline solution due to the neutralization of alkali and lactic acid, which produced from the hydrolysis of PLA. All the aged composites have a decline on mechanical properties in both solutions due to the degradation of jute fiber, PLA, and the interface between fiber and matrix. Mechanical strength of the composites under alkaline environment was lower than that of the composites under saline environment after aging.

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“…As excellent alternatives to their traditional counterparts, composite materials and structures have found more and more applications in many engineering areas such as aerospace engineering, automotive manufacturing, marine engineering, mechanical engineering, and civil engineering . First invented in the 1930s, glass fiber‐reinforced polymer (GFRP) represents the most successful application of fiber‐reinforced polymers (FRPs), due to its high strength, lightweight, corrosion resistance, flexible molding shapes, low maintenance, and good durability .…”

Section: Introductionmentioning

confidence: 99%

Improved hydrothermal aging performance of glass fiber‐reinforced polymer composites via silica nanoparticle coating

Zhang

2019

J of Applied Polymer Sci

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The long-term exposure to a hot and humid environment severely damages the bonding integrity of fiber-reinforced polymer composites and thus significantly degrades their mechanical performances. In this work, we aim to develop an improvement procedure for effectively enhancing the bonding strength in glass fiber-reinforced polymers (GFRPs). Glass fibers were coated with a thin layer of silica nanoparticles of different concentrations by the use of the evaporative deposition method. Micromorphological comparisons in terms of scanning electron microscope imaging demonstrate significant improvements on the surface roughness of glass fibers. With the coated glass fibers, GFRP composite laminates were designed, molded through the vacuum-assisted resin infusion technique, and experimentally tested for quantitatively studying their hydrothermal aging performance. The water absorption tests conducted for three exposure temperatures suggest that both the water diffusion rate and the equilibrium water content can be effectively reduced due to the introduction of the silica coating. With increased exposure temperatures, however, the desired reductions become much less significant. A so-called water-channel diffusion mechanism along fiber/resin interfaces was proposed to explain the coupling effects of silica coating and exposure temperature. Reductions of water diffusion rate and equilibrium water content were expected to slow down the hydrothermal aging performance of GFRPs. For this purpose, both uniaxial tensile test and three-point bending test were subsequently performed on GFRP specimens that have been subjected to different coating concentrations, exposure temperatures, and exposure durations. When compared with untreated GFRP specimens, both experiments demonstrate that the residual strength and stiffness can be effectively promoted through coating a thin layer of silica nanoparticles on glass fiber surfaces.

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Effect of Hydrothermal Aging on Injection Molded Short Jute Fiber Reinforced Poly(Lactic Acid) (PLA) Composites

Cited by 43 publications

References 45 publications

Environmental Degradation of Plastic Composites with Natural Fillers—A Review

Environmental Degradation of Plastic Composites with Natural Fillers—A Review

Effect of saline and alkaline solution aging on the properties of jute/poly(lactic acid) composites

Improved hydrothermal aging performance of glass fiber‐reinforced polymer composites via silica nanoparticle coating

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