Dynamic mechanical analysis, surface chemistry and morphology of alkali and enzymatic retted kenaf fibers

Ramesh, Dinesh; Ayre, Brian G.; Webber, Charles L.; D’Souza, Nandika Anne

doi:10.1177/0040517515576322

Cited by 25 publications

(14 citation statements)

References 16 publications

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“…The surface structure of the fiber contributes to fiber behavior in subsequent applications, including the interactions between the fiber and polymer matrix in composite materials (Ramesh et al 2015). Scanning electron microscopy was used to evaluate the surface structure of the raw and steam-treated kenaf.…”

Section: Sem Analysismentioning

confidence: 99%

Effect of Steam Pressure on Chemical and Structural Properties of Kenaf Fibers during Steam Explosion Process

Zhang¹,

Han²,

Jiang³

et al. 2016

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The chemical and structural properties of kenaf fibers that were treated at different steam pressures during the steam explosion process were investigated. With increased steam pressure, a higher percentage of cellulose and acid-insoluble lignin and a lower content of hemicellulose and pectin were obtained. This result was further confirmed by Fourier transform infrared (FTIR) spectroscopy. X-ray diffraction (XRD) studies revealed that the steam-exploded kenaf fibers were more crystalline than the raw kenaf fibers, and that excessive steam pressure above 3 MPa damaged the cellulose crystalline structure. Scanning electron microscopy (SEM) analysis showed a change in the surface morphology of the treated kenaf fibers. The lower content of gums and the effective defibrillation of steam-exploded kenaf fibers demonstrated the potential of steam explosion treatment in applications of kenaf fibers.

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Section: Sem Analysismentioning

confidence: 99%

Effect of Steam Pressure on Chemical and Structural Properties of Kenaf Fibers during Steam Explosion Process

Zhang¹,

Han²,

Jiang³

et al. 2016

BioResources

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“…The screening of superior bacterial strains with the activity of pectate lyase, pectinase, hemicellulase and/or ligninase and the preservation of the natural fiber structure and mechanical properties is crucial for biological degumming [7][8][9]. A series of bacterial strains have been identified with strong ability of retting or degumming, like Bacillus cereus hn1-1 [10], B. pumilus [7], B. licheniformis and B. subtilis [11] and B. tequilensis SV11-UV37 [6].…”

Section: Introductionmentioning

confidence: 99%

Insights on bio-degumming of kenaf bast based on metagenomic and proteomics

et al. 2020

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Background: Microbes play important roles in kanef-degumming. This study aims at identifying the key candidate microbes and proteins responsible for the degumming of kenaf bast (Hibiscus cannabinus). Kenaf bast was cut into pieces and immersed into microbia fermentation liquid collected from different sites. Fermentation liquid samples were collected at 0, 40, 110 and 150 h and then subjected to the 16S/18S rRNA sequencing analysis and isobaric tag for relative and absolute quantitation (iTRAQ) analysis. The microbial (bacterial and fungal) diversity and the differentially expressed proteins/peptides (DEPs) were identified. Results: With the prolonged degumming time, the weight loss rate increased, the bacterial diversity was decreased. [Weeksellaceae], Enterobacteriaceae and Moraxellaceae were rapidly increased at 0~40 h, and then decreased and were gradually replaced by Bacteroidaceae from 40 h to 150 h. Similarly, Chryseobacterium and Dysgonomonas were gradually increased at 0~110 h and then decreased; Acinetobacter and Lactococcus were increased at 0~40 h, followed by decrease. Bacteroides was the dominant genus at 150 h. Sequencing 18S rRNA-seq showed the gradually decreased Wallemia hederae and increased Codosiga hollandica during degumming. iTRAQ data analysis showed Rds1, and pyruvate kinase I was decreased and increased in the kanef-degumming, respectively. Other DEPs of ferredoxin I, superoxide dismutase and aconitatehydratase were identified to be related to the Glyoxylate and dicarboxylate metabolism (ko00630). Conclusions: Bacteria including Chryseobacterium, Dysgonomonas, Acinetobacter, Lactococcus and Bacteroidesand fungi like Wallemia hederae and Codosiga hollandica are key candidate microbes for kanef degumming.

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“…1) whose physical morphology and mechanical properties depend on the age, and condition of growth and development. In our previous work on kenaf bast fiber, we have compared two different post processing retting environments in plant fibers to create porous and non-porous fibers with core-shell architectures [2,3]. Using an alkali retting approach, fibers were formed where the plant cell walls collapsed with few active functional groups that were available on the surface.…”

Section: Introductionmentioning

confidence: 99%

Bioinspired cellular sheath-core electrospun non-woven mesh

et al. 2019

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Fibers are valuable to biomedical applications. Used as sutures or meshes, there is an increased dual need to provide functionality such as drug delivery. Porosity represents a high surface area to volume architecture. Coaxial fibers with porous and non-porous layers offer a new design framework for fiber design that can resolve dual needs of mechanical robustness with transport phenomena. Using preferential solubility of a polymer in supercritical CO 2 , we develop a new architecture using biocompatible polymers based on porous core-sheath fiber fabrication technique. Polycaprolactone was selected as the CO 2 miscible phase and Poly(butyrate adipate terephthalate)(PBAT) as the immiscible phase. The mechanical performance of the fibers was investigated using quasi static and dynamic loading. SEM images indicate no physical detachment of the two polymer surface after CO 2 exposure indicating a successful amalgamation of polymers at the boundary of core and sheath. PCL as a sheath and as a core showed an increase of 650% and 468% in tensile strength compared to pristine PCL and PBAT. Introduction of porosity on the surface of coaxial fiber fPCL(cPBAT) further enhanced the yield strength increases by 40%. Dynamic mechanical analysis was used to analyze the viscoelastic properties of the fibers. The storage and loss modulus for coaxial fibers shows superior modulus throughout the glassy, glass transition and rubbery region as compared to the pristine PCL and PBAT, showing enhancement in both the elastic and viscous response of the material. The results indicate a new approach that is free of volatile organic solvents to manipulate the architecture of the cross-section of the electrospun fiber and tailor mechanical properties to the required application.

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Dynamic mechanical analysis, surface chemistry and morphology of alkali and enzymatic retted kenaf fibers

Cited by 25 publications

References 16 publications

Effect of Steam Pressure on Chemical and Structural Properties of Kenaf Fibers during Steam Explosion Process

Effect of Steam Pressure on Chemical and Structural Properties of Kenaf Fibers during Steam Explosion Process

Insights on bio-degumming of kenaf bast based on metagenomic and proteomics

Bioinspired cellular sheath-core electrospun non-woven mesh

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