Dynamic mechanical analysis of randomly oriented intimately mixed short banana/sisal hybrid fibre reinforced polyester composites

Idicula, Maries; Malhotra, S.K.; Joseph, Kuruvilla; Thomas, Sabu

doi:10.1016/j.compscitech.2004.10.023

Cited by 465 publications

(290 citation statements)

References 25 publications

Supporting

Mentioning

275

Contrasting

Unclassified

Order By: Relevance

“…This behavior could be observed for all the samples, treated and untreated. Indicula et al 18 , found similar results and suggested that the high loading of coconut fiber leads to agglomeration and stress transfer becoming blocked, and as result, mechanical strength decreases.…”

Section: Electrical Conductivity Evaluationsupporting

confidence: 60%

Polypropylene matrix composites reinforced with coconut fibers

2011

View full text Add to dashboard Cite

Polypropylene matrix composites reinforced with treated coconut fibers were produced. Fibers chemically treated (alkalization-CCUV samples) or mechanically treated (ultrasonic shockwave-CMUV samples) were dried using UV radiation. The goal was to combine low cost and eco-friendly treatments to improve fiber-matrix adhesion. Composite samples containing up to 20 vol. (%) of untreated and treated coconut fibers were taken from boxes fabricated by injection molding. Water absorption and mechanical properties were investigated according to ASTM D570-98 and ASTM D638-03, respectively. Electrical characterizations were carried out to identify applications of these composites in the electrical sector. NBR 10296-Electrical Tracking Standard (specific to industry applications) and conductivity measurements were obtained applying 5 kV DC to the samples. CMUV samples containing 5 vol. (%) fiber presented superior tensile strength values (σ~28 MPa) compared to the untreated fibers composite (σ~22 MPa) or alkali treatment (σ~24 MPa). However, CMUV composites containing 10 vol. (%) fiber presented best results for the electrical tracking test and electrical resistivity (3 × 10 7 Ω.m). The results suggest that composites reinforced with mechanically treated coconut fibers are suitable for electrical applications.

show abstract

Section: Electrical Conductivity Evaluationsupporting

confidence: 60%

Polypropylene matrix composites reinforced with coconut fibers

2011

View full text Add to dashboard Cite

show abstract

“…Dynamic mechanical analysis (DMA) is an effective method for studying the relaxations in polymers and thereby the behavior of the material under various conditions of stress, temperature, and types of fiber. This analysis furnished information about storage and loss moduli (associated with the T g ), and tan δ is associated with the impact resistance 26 . In addition, DMA is related to the mobility of the polymer chain segments, and it has been widely used in studies on composite materials, where a more careful approach for anisotropic materials is currently required 27 .…”

Section: Introductionmentioning

confidence: 99%

Polypropylene Composites Reinforced with Biodegraded Sugarcane Bagasse Fibers: Static and Dynamic Mechanical Properties

et al. 2016

View full text Add to dashboard Cite

The present work aimed to study sugarcane bagasse fibers pre-treated with fungi and using NaOH/ anthraquinone (AQ) in chemical pulping processes for applications in composite materials. Bagasse was decayed with 250 mg of Ceriporiopsis subvermispora inoculum in a 20 L bioreactor. After that, samples were submitted to similar conditions of decaying without inoculum charge. Decayed and undecayed fibers were treated with NaOH 12.5 wt%, 0.15 of AQ and a 12:1 (v/w) liquor:bagasse ratio at 160°C. Then, all obtained fibers were characterized according to their chemical composition. Dried biotreated (decayed) and control (undecayed) fibers were mixed through an extruder process with polypropylene. Later, composite granulates were injected directly in mold with cavities for tensile, flexural and shear tests. Composite materials with 10 and 20 wt% fibers were submitted to static mechanical standard tests and DMA (Dynamic Mechanical Analysis) to evaluate the effect of biotreatment. Biotreatment, cook time (pulping), and fiber content contributed to improvements in the mechanical properties of the composites. The interface between fiber and matrix was increased with the biotreatment and pulping of fibers. Furthermore, DMA results also showed that fiber incorporation into PP improved the modulus, mainly for biotreated fibers/PP composites. The T g (tan δ data) from composites was dislocated at lower temperatures with respect to neat PP due to the influence of fibers on matrix.

show abstract

“…The coefficient of reinforcement effectiveness can be used to evaluate how effective the reinforcement is at maintaining the modulus as the temperature increases in comparison to the pure resin. The maximum effect occurs when the stress transfer between matrix and fiber is maximized, and low C values indicate greater effectiveness 21 , i.e. lower C values would be expected for the pure glass fiber laminate.…”

Section: Dynamic Mechanical Characterization Of the Laminatesmentioning

confidence: 99%