“…One of the goals of this article is to compare their morphologies, crystalline structure and outline the major factors that might be influencing the interactions with latex (NR) matrix and the resulting reinforcing effects on the matrix polymer. Numerous studies have been carried out using various cellulosic nanofibers for polymer reinforcement . These studies dealt with the thermal, mechanical and dielectric behavior of NR‐NFC and NR‐CNW nanocomposites.…”
“…One of the goals of this article is to compare their morphologies, crystalline structure and outline the major factors that might be influencing the interactions with latex (NR) matrix and the resulting reinforcing effects on the matrix polymer. Numerous studies have been carried out using various cellulosic nanofibers for polymer reinforcement . These studies dealt with the thermal, mechanical and dielectric behavior of NR‐NFC and NR‐CNW nanocomposites.…”
“…The EP effect becomes increasingly important at high temperatures, reflecting the enhancement of the mobility of charge carriers. 20,21 Figure 5.Frequency dependence of ac conductivity σac in PF matrix between 120 and 180℃. EP: electrode polarization; PF: phenolic resin.…”
Section: Dielectric Results and Discussionmentioning
confidence: 99%
“…The EP effect becomes increasingly important at high temperatures, reflecting the enhancement of the mobility of charge carriers. 20,21…”
This work deals with the dielectric properties of silane treated pineapple leaf fiber and kenaf fiber reinforced phenolic hybrid composites. The aim of the present paper is to investigate the effect of silane treatment on the pineapple leaf fiber–kenaf fiber/matrix interfacial adhesion using the dielectric relaxation spectroscopy in the frequency range from 0.1 Hz to 1 MHz and temperature range from 50 to 180℃. Our hybrid composites were fabricated by hand lay-up method at 50% total fiber loading. All the results obtained were discussed in terms of dynamic molecular and interfacial process. Two interfacial polarizations identified as the Maxwell–Wagner–Sillars effect are observed. We note that silane treatment improved the interfacial adhesion between pineapple leaf fiber/kenaf fiber and phenolic resin and it will help to develop high performance kenaf fiber/pineapple leaf fiber reinforced polymer composites for industrial applications. In fact, as known, the silane treatment developed hydrophobic nature in pineapple leaf fiber and kenaf fiber which is very positive for fiber/matrix compatibility.
“…[21] At a higher temperature domain, a considerable increase in the real (ε 0 ) and imaginary (ε 00 ) parts of the dielectric function appears at low frequencies range, revealing an ionic conduction phenomenon that emerges from the increase of the free charges mobility in PLA with the increase of temperature. [42][43][44] Based on the calculation of the slope of log(ε 00 ) for Neat PLA at low frequency and high temperature ( Figure 5), the effect of the dc conduction is confirmed by a slope of about −1. [45] These results are also proved by the existence of a plateau in the isothermal conductivity plot at high temperatures as depicted in Figure 5.…”
The dielectric spectroscopy (DS), the differential scanning calorimetry (DSC), the scanning electron microscope (SEM) and the Fourier transform infrared spectroscopy (FTIR) measurements were performed on a poly(lactic acid) matrix reinforced by sisal fibers with different weight fractions (10% and 20%). The obtained dielectric spectra of the neat PLA and the PLA/sisal biocomposites covered a wide frequency range (from 10 −1 to 10 6 Hz) and a temperature domain varying from 20 C to 140 C as it serves to investigate the polymer dynamics and the interfacial properties. The DSC analysis, the SEM micrographs and the FTIR spectra were executed to determine the characteristic temperatures, the degree of crystallinity and the interaction between poly(lactic acid) and sisal fibers. The DS showed different relaxations: the β relaxation, α process and the conduction phenomenon in the PLA matrix. Furthermore, the incorporation of sisal fiber generates additional relaxation processes known as the water polarization and the Maxwell-Wagner-Sillars (MWS) interfacial polarization. The PLA/sisal fiber interface properties were investigated through the calculation of the strength parameters Δε MWS as well as the activation energy using the Havriliak-Negami model. K E Y W O R D S bio-composites, interfacial polarization effect, sisal fibers, thermal properties 1 | INTRODUCTION The growing environmental and economic challenges have encouraged researchers and producers in the packaging industry to replace petrochemical-based polymers with biodegradable ones. [1] Among such bio-polymers, the poly(lactic acid) (PLA) elaborated from the polymerization of L-lactic acid is the most popular, as a result of its mechanical and thermal properties. [2] PLA is a semicrystalline, hydrophobic, low toxicity, biocompatible and biodegradable polymer. [3-5] However, the main obstacles to its broad commercialization and development are its brittle nature and slow crystallization. [6] This polymer has gained considerable interest in a variety of biomedical applications such as coating, absorbable sutures, stents, orthopedic plates and screws. [7] The PLA is also involved in other industrial sectors such as automobile, electronics and thermal insulation of buildings. [8,9] Additional researches on PLA considered its use for applications in textiles, adhesive, agriculture products and packaging [5] due to its thermoplastic processing capacity and biodegradability properties under particular conditions. [10] However, its fragile character persists as it demonstrates a poor rigidity and low elongation at break, and its degradation rate remains slow. [1,2] Research has been carried out to resolve these defects by copolymerizing
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