Recycling of sisal fiber reinforced polypropylene and polylactic acid composites: Thermo-mechanical properties, morphology, and water absorption behavior

Ngaowthong, Chakaphan; Borůvka, Martin; Bĕhálek, Luboš; Lenfeld, Petr; Švec, Martin; Dangtungee, Rapeephun; Siengchin, Suchart; Rangappa, Sanjay Mavinkere; Parameswaranpillai, Jyotishkumar

doi:10.1016/j.wasman.2019.07.038

Cited by 86 publications

(34 citation statements)

References 41 publications

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“…Thus, the water molecules form hydrogen bonds with the hydroxyl groups present in the cellulosic fibers diffusing the water molecules at the matrix/fiber interface. Similar results were obtained by Ngaowthong et al 66 and Singh et al 67 The WA results from our study were significantly lower than most fiber‐reinforced HDPE composites. 66,67 Despite seeing an increase in the WA of our composites, they are within the target range of moisture content in WPCs, which is approximately 7%–15%, depending on location and environment 68 .…”

Section: Resultssupporting

confidence: 92%

Effects of short fibers and processing additives on HDPE composites properties reinforced with Pinus and Eucalyptus fibers

Mendes

Castro

Corrêa

et al. 2020

J of Applied Polymer Sci

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This work aimed to investigate the effect of adding short fibers of Pinus and Eucalyptus, in different granulometry (24 and 200 mesh) and concentration (0–20 m/m), combined with processing aid Struktol TPW104 (S) in obtaining of high‐density polyethylene (HDPE) composites. Overall, obtaining composites from short fibers caused relevant changes in the HDPE matrix, such as thermal stability, moisture barrier. In comparison to pure HDPE, the composites incorporated with 20% m/m of fibers, regardless of the type, decreased the melting temperature to 128°C and a wider crystallization temperature range. Another significant observation was the improvement of composites mechanical profile after adding the additive, the highest values were obtained for composites HDPEL20PS (35%—TS e 651%—EM) and HDPEL20ES (42%—TS e 681%—EM), showing good interaction and compatibility, according to scanning electron microscopy (SEM) images. The same was verified with the mechanical results of flexion and impact. Therefore, the use of short fibers and processing aid was successful providing augmented mechanical properties and thermal stability, without negatively affecting their essential properties for industrial applications.

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Section: Resultssupporting

confidence: 92%

Effects of short fibers and processing additives on HDPE composites properties reinforced with Pinus and Eucalyptus fibers

Mendes

Castro

Corrêa

et al. 2020

J of Applied Polymer Sci

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show abstract

“…[109,110] In transportation industry, approximately 10% of the weight of the vehicle is plastic. This process begins with T A B L E 2 Properties of PLA, PLLA, PDLA, and PDLLA 71,94,95 PLA is designed to decompose quickly, but researchers want to make sure it will last the lifetime of a vehicle before that decomposition process starts [111,112] Agriculture Compostable Higher cost compared to conventional plastics [113,114] rarely-seen components, such as engine covers and impact shields, and extends to exterior components including doors and instrument panels. Most of these plastics used contain heavy glass fibers, which increase their strength.…”

Section: Application Of Plamentioning

confidence: 99%

“…The examples are PLA mulch films and PLA contaminated packages. [113,114] Table 3 shows the use of PLA as well as its advantages and disadvantages in various applications.…”

Section: Application Of Plamentioning

confidence: 99%

A review on degradation mechanisms of polylactic acid: Hydrolytic, photodegradative, microbial, and enzymatic degradation

Zaaba

Jaafar

2020

Polymer Engineering & Sci

377

247

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Recently, thoughtful disagreements between scientists concerning environmental issues including the use of renewable materials have enhanced universal awareness of the use of biodegradable materials. Polylactic acid (PLA) is one of the most promising biodegradable materials for commercially replacing nondegradable materials such as polyethylene terephthalate and polystyrene. The main advantages of PLA production over the conventional plastic materials is PLA can be produced from renewable resources such as corn or other carbohydrate sources. Besides, PLA provides adequate energy saving by consuming CO2 during production. Thus, we aim to highlight recent research involving the investigation of properties of PLA, its applications and the four types of potential PLA degradation mechanisms. In the first part of the article, a brief discussion of the problems surrounding use of conventional plastic is provided and examples of biodegradable polymers currently used are provided. Next, properties of PLA, and (Poly[L‐lactide]), (Poly[D‐lactide]) (PDLA) and (Poly[DL‐lactide]) and application of PLA in various industries such as in packaging, transportation, agriculture and the biomedical, textile and electronic industry are described. Behaviors of PLA subjected to hydrolytic, photodegradative, microbial and enzymatic degradation mechanisms are discussed in detail in the latter portion of the article.

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“…The abundance of C–O bonds and C=O bonds increased with increasing PA concentration, while the abundance of O–C=O groups first increased and then decreased with increasing PA concentration. The O–C=O combined with the hydroxyl group on the adjacent C atoms to form CO 2 , resulting in a decrease in the content of O–C=O at high PA concentrations, resulting in a slight decrease in the interfacial shear strength [ 47 , 48 ]. Thus, the optimal PA concentration was determined to be 2 g/L.…”

Section: Resultsmentioning

confidence: 99%

Orthogonal Experimental Analysis and Mechanism Study on Electrochemical Catalytic Treatment of Carbon Fiber-Reinforced Plastics Assisted by Phosphotungstic Acid

2020

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Preserving the integrity of carbon fibers when recycling carbon-fiber-reinforced plastics (CFRPs) has been unfeasible due to the harsh reaction conditions required to remove epoxy resin matrixes, which adversely affect the properties of carbon fibers. We establish a practicable and environmentally friendly reclamation strategy for carbon fibers. Carbon fibers are recycled from waste CFRPs by an electrochemical catalytic reaction with the assistance of phosphotungstic acid (PA), which promotes the depolymerization of diglycidyl ether of bisphenol A/ethylenediamine (DGEBA/EDA) epoxy resin. The removal rate, mechanical strength, and microstructure of the recycled carbon fibers are analyzed to explore the mechanism of the electrochemical treatment. The influence of three factors—current density, PA concentration, and reaction time—are studied via an orthogonal method. Range analysis and variance analysis are conducted to investigate the significance of the factors. The optimal conditions are determined accordingly. The underlying CFRP degradation mechanism is also investigated.

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Recycling of sisal fiber reinforced polypropylene and polylactic acid composites: Thermo-mechanical properties, morphology, and water absorption behavior

Cited by 86 publications

References 41 publications

Effects of short fibers and processing additives on HDPE composites properties reinforced with Pinus and Eucalyptus fibers

Effects of short fibers and processing additives on HDPE composites properties reinforced with Pinus and Eucalyptus fibers

A review on degradation mechanisms of polylactic acid: Hydrolytic, photodegradative, microbial, and enzymatic degradation

Orthogonal Experimental Analysis and Mechanism Study on Electrochemical Catalytic Treatment of Carbon Fiber-Reinforced Plastics Assisted by Phosphotungstic Acid

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