scholarly journals In-situ Reactive Interfacial Compatibilization and Properties of Polylactide/Sisal Fiber Biocomposites via Melt-blending with Epoxy-functionalized Oligomer

2018 ◽  
Author(s):  
Mingyang Hao ◽  
Hongwu Wu ◽  
Feng Qiu ◽  
Xiwen Wang
Keyword(s):  
Fiber Surface ◽  
Mechanical Analysis ◽  
Interfacial Interaction ◽  
Molecular Chain ◽  
Sisal Fiber ◽  
Key Points ◽  
Sisal Fibers ◽  
Relationship Of ◽  
Calculated Activation

To improve the interfacial bonding of sisal fiber reinforced polylactide biocomposites, polylactide (PLA) and sisal fibers (SF) were melt-blended to fabricate bio-based composites via in situ reactive interfacial compatibilization with the addition of an epoxy-functionalized oligomer (ADR). The FTIR analysis and SEM characterization demonstrated that PLA molecular chain was bonded to the fiber surface and epoxy-functionalized oligomer played a hinge-like role between sisal fibers and PLA matrix, which resulted in improved interfacial adhesion between fibers and PLA matrix. The interfacial reaction and microstructures of composites were further investigated by thermal and rheological analyses, which indicated that the mobility of the PLA molecular chain in composites was restricted because of the introduction of ADR oligomer, which in turn reflected the improved interfacial interaction between SF and PLA matrix. These conclusions were further investigated by the calculated activation energies of glass transition relaxation (△Ea) of composites via dynamic mechanical analysis. The mechanical properties of PLA/SF composites were simultaneously reinforced and toughened via addition of ADR oligomer. The interfacial interaction and structure-properties relationship of composites are key points of this study.

scholarly journals Strengthening and Toughening of Polylactide/Sisal Fiber Biocomposites via in-situ Reaction with Epoxy-Functionalized Oligomer and Poly (butylene-adipate-terephthalate)

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1747 ◽  
Author(s):  
Hongwu Wu ◽  
Mingyang Hao
Keyword(s):  
Interfacial Adhesion ◽  
Fiber Composites ◽  
Sisal Fiber ◽  
Ftir Analysis ◽  
Reactive Process ◽  
Commercial Grade ◽  
Sisal Fibers ◽  
Relationship Of ◽  
Structure Properties

With the addition of poly (butylene-adipate-terephthalate) (PBAT) and a commercial grade epoxy-functionalized oligomer Joncryl ADR@-4368 (ADR), a blend of polylactic acid (PLA) and sisal fibers (SF) were melt-prepared via in-situ reactive process to improve the toughness and interfacial bonding of polylactide/sisal fiber composites. Fourier Transform infrared spectroscopy (FTIR) analysis demonstrated chemical bonding between sisal fibers and matrix, and scanning electron microscope characterization indicated the enhancement of interfacial adhesion between PLA matrix and sisal fibers. The micro-debonding test proved that the interfacial adhesion between PLA and SF was improved because of ADR. The presence of ADR behaved like a hinge among sisal fibers and matrix via an in-situ interfacial reaction, and compatibility between PLA and PBAT was also augmented. The introduction of PBAT exerted a plasticization effect on composites. Therefore, the toughness of PLA/SF composites was significantly elevated, while the tensile strength of composites could be well preserved. The paper focused on the demonstration of interfacial interaction and structure–properties relationship of the composites.

Evaluation of Interfacial Properties of Sisal Fiber Reinforced High Density Polyethylene (HDPE) Composites

2007 ◽  
Vol 334-335 ◽  
pp. 625-628 ◽  
Author(s):  
Yan Li ◽  
Hong Xia Deng ◽  
Ye Hong Yu
Keyword(s):  
Natural Fiber ◽  
Fiber Surface ◽  
Interfacial Properties ◽  
Sisal Fiber ◽  
Fiber Reinforced ◽  
Statistical Parameters ◽  
Pull Out ◽  
Bonding Properties ◽  
Fiber Surface Treatment ◽  
Sisal Fibers

Statistical methods were employed to study the structure characteristics of sisal fibers. Two types of fiber surface treatment methods, namely chemical bonding and oxidization were used to improve the interfacial bonding properties of sisal fiber reinforced HDPE (sisal/HDPE) composites. Interfacial properties were evaluated by single fiber pull out test. The interfacial shear strength (IFSS) was calculated and analyzed by the statistical parameters. The results were compared with those obtained by traditional ways. A novel method which could more accurately evaluate the interfacial properties between natural fiber and polymeric matrices was proposed.

The Effect of Chemical Treatment on Sisal Fiber Property

2013 ◽  
Vol 821-822 ◽  
pp. 72-75
Author(s):  
Yun Hong Deng ◽  
Hong Ling Liu ◽  
Wei Dong Yu
Keyword(s):  
Contact Angle ◽  
Chemical Treatment ◽  
Alkali Treatment ◽  
Fiber Surface ◽  
Sisal Fiber ◽  
Alkali Concentration ◽  
Concentration Increase ◽  
Structure And Property ◽  
Sisal Fibers ◽  
High Alkali

The aim of this work was to research the effect of chemical treatment on the structure and property of sisal fiber. The changes of the surface morphology, chemical composition and wettability of different alkali concentration treated sisal fibers were studied using Scanning Electron Microscope (SEM), Fourier Transform Infrared (FTIR) and Optical Contact Angle Meter (OCA). The results showed that the non-cellulosic materials were removed from fiber surface and many branches along the fibers were caused by high alkali concentration. Deconvolving spectra in OH stretching region exhibited the amount of hydrogen bonding decreased firstly and then increased with the alkali concentration increase. The effect of alkali treatment on the wettability of fibers was characterized by the contact angle analyses. The contact angle of fiber decreased gradually with the concentration increase.

scholarly journals Effect of Sisal Fiber Surface Treatment on Properties of Sisal Fiber Reinforced Polylactide Composites

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Zhaoqian Li ◽  
Xiaodong Zhou ◽  
Chonghua Pei
Keyword(s):  
Mechanical Properties ◽  
Fiber Surface ◽  
Mechanical Analysis ◽  
Sisal Fiber ◽  
Fiber Reinforced ◽  
Reinforced Composite ◽  
Superior Mechanical Properties ◽  
Fiber Surface Treatment ◽  
Properties Of Composites

Mechanical properties of composites are strongly influenced by the quality of the fiber/matrix interface. The objective of this study was to evaluate the mechanical properties of polylactide (PLA) composites as a function of modification of sisal fiber with two different macromolecular coupling agents. Sisal fiber reinforced polylactide composites were prepared by injection molding, and the properties of composites were studied by static/dynamic mechanical analysis (DMA). The results from mechanical testing revealed that surface-treated sisal fiber reinforced composite offered superior mechanical properties compared to untreated fiber reinforced polylactide composite, which indicated that better adhesion between sisal fiber and PLA matrix was achieved. Scanning electron microscopy (SEM) investigations also showed that surface modifications improved the adhesion of the sisal fiber/polylactide matrix.

scholarly journals Study and Characterization of Sisal Fiber/Zein Resin Interface

2020 ◽  
Vol 8 (2) ◽  
pp. S1-S19
Author(s):  
Hamid Souzandeh ◽  
Anil N. Netravali
Keyword(s):  
Interfacial Shear Strength ◽  
Fiber Surface ◽  
Microfibrillated Cellulose ◽  
Sisal Fiber ◽  
X Ray ◽  
Before And After ◽  
Microbond Test ◽  
Zein Protein ◽  
Sisal Fibers

The interfacial shear strength (IFSS) between natural sisal fiber and zein protein resin was explored using the microbond test. Commercially available zein protein was processed into resins and their IFSS with sisal fiber was measured. Effects of sorbitol plasticizer content and microfibrillated cellulose (MFC) reinforcement loading on the IFSS with the resin were studied. Scanning electron microscopy (SEM) was used to characterize the fracture surfaces before and after the microbond test. Energy dispersive X-ray spectroscopy (EDX) was utilized to map the residual resin on the sisal fiber surface after the microbond test. The results showed that sisal fiber/ zein IFSS decreased with sorbitol content. At 20 wt% sorbitol content 53% decrease in IFSS was observed. IFSS increased with MFC loading from 1.32 MPa (control) to 2.40 MPa for resin containing 15 wt% MFC. Physical entanglements between sisal fibers and MFC are believed to be responsible for this enhancement in the IFSS.

scholarly journals ANALISIS PENGARUH PERLAKUAN KIMIA TERHADAP MORFOLOGI DAN GUGUS FUNGSIONAL SERAT SISAL

2021 ◽  
Vol 2 (1) ◽  
pp. 22-26
Author(s):  
Purwanto Purwanto ◽  
Arif Rakhman Suharso ◽  
Fajar Sari Kurniawan
Keyword(s):  
Functional Groups ◽  
Group Analysis ◽  
Fiber Surface ◽  
Molecular Structures ◽  
Sisal Fiber ◽  
Surface Appearance ◽  
Bleaching Process ◽  
Pure Cellulose ◽  
Before And After ◽  
Sisal Fibers

Morphological and functional group analysis was carried out to study the appearance of micro and molecular structures contained in sisal fibers before and after chemical scouring and bleaching treatment. The scouring and bleaching process lasts for 1 hour with continuous stirring using a magnetic stirrer. Scouring was carried out with 6% NaOH solution while Bleaching was carried out with a solution of 10 g / L NaOH and 100 ml / L H2O2. Scanning Electron Microscopy (SEM) was used to identify the surface appearance and diameter of the fibers before and after the scouring and bleaching processes. Fourier transform infrared (FTIR) spectroscopy is used to identify functional groups in fibers. The Bleaching  process shows that the functional groups identified are the same as those of pure cellulose or alpha cellulose, namely -CH2, C-O, C = C, -CH3, C?C, and -OH, C-H. Sisal fibers with a diameter between 100 - 150 µm break down (fibrillate) into smaller fibers after the scouring (diameter: ?12 µm) and bleaching (diameter: ?7µm) processes. Thus, scouring and bleaching have caused significant changes in the morphological and microstructure of the fiber surface and also the functional groups that the sisal fiber has after the bleaching process is the same as pure fiber.

The Effects of Fiber Architecture and Fiber Surface Treatment on Physical Properties of Woven Sisal Fiber/Epoxy Composites

2011 ◽  
Vol 410 ◽  
pp. 39-42
Author(s):  
Sawitri Srisuwan ◽  
Pranee Chumsamrong
Keyword(s):  
Surface Treatment ◽  
Flexural Modulus ◽  
Fiber Surface ◽  
Epoxy Composites ◽  
Sisal Fiber ◽  
Fiber Architecture ◽  
Untreated Fiber ◽  
Fiber Surface Treatment ◽  
Sisal Fibers ◽  
Twill Weave

The aim of this work was to investigate the effects of fiber architecture and fiber surface treatment on flexural and impact properties of woven sisal fiber/epoxy composites. The woven sisal fibers with three different weave types including plain weave (P-weave), harness satin weave (S-weave) and right hand twill weave (R-weave) were used. For untreated fiber/epoxy composites, the fiber contents in the composite were 0, 5, 10 and 15% by weight (%wt). The untreated S-weave sisal fiber/epoxy composites showed the best overall properties and the composites with 15% fiber loading showed the highest properties. When compared to pure epoxy, flexural strength, flexural modulus and impact strength of the composite with 15% wt fiber increased by 4.5%, 60.6% and 150% respectively. Therefore, the composite of 15% wt silane treated S-weave and epoxy was prepared in order to study the effect of fiber surface treatment. The results showed that the composite containing 15% wt silane treated fiber possessed nearly the same properties with the untreated fiber/epoxy composite.

Influence of Fiber Surface Energy on Mechanical Properties of Sisal Fiber - Bio Based Epoxy Composites

2019 ◽  
Vol 35 (4) ◽  
pp. 485-496
Author(s):  
S. RAJKUMAR ◽  
◽  
R. JOSEPH BENSINGH ◽  
M. ABDUL KADER ◽  
SANJAY K NAYAK ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Surface Energy ◽  
Fiber Surface ◽  
Epoxy Composites ◽  
Sisal Fiber

scholarly journals Chemical Modification as a Method of Improving Biocompatibility of Carbon Nonwovens

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3198
Author(s):  
Justyna Frączyk ◽  
Sylwia Magdziarz ◽  
Ewa Stodolak-Zych ◽  
Ewa Dzierzkowska ◽  
Dorota Puchowicz ◽  
...  
Keyword(s):  
Surface Modification ◽  
Cellular Response ◽  
Fiber Surface ◽  
Thermal Conversion ◽  
Cartilage Tissue ◽  
Polar Component ◽  
Nonwoven Fabrics ◽  
Biological Compatibility ◽  
Starting Point

It was shown that carbon nonwoven fabrics obtained from polyacrylonitrile fibers (PAN) by thermal conversion may be modified on the surface in order to improve their biological compatibility and cellular response, which is particularly important in the regeneration of bone or cartilage tissue. Surface functionalization of carbon nonwovens containing C–C double bonds was carried out using in situ generated diazonium salts derived from aromatic amines containing both electron-acceptor and electron-donor substituents. It was shown that the modification method characteristic for materials containing aromatic structures may be successfully applied to the functionalization of carbon materials. The effectiveness of the surface modification of carbon nonwoven fabrics was confirmed by the FTIR method using an ATR device. The proposed approach allows the incorporation of various functional groups on the nonwovens’ surface, which affects the morphology of fibers as well as their physicochemical properties (wettability). The introduction of a carboxyl group on the surface of nonwoven fabrics, in a reaction with 4-aminobenzoic acid, became a starting point for further modifications necessary for the attachment of RGD-type peptides facilitating cell adhesion to the surface of materials. The surface modification reduced the wettability (θ) of the carbon nonwoven by about 50%. The surface free energy (SFE) in the chemically modified and reference nonwovens remained similar, with the surface modification causing an increase in the polar component (ɣp). The modification of the fiber surface was heterogeneous in nature; however, it provided an attractive site of cell–materials interaction by contacting them to the fiber surface, which supports the adhesion process.

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