The Experts below are selected from a list of 1074 Experts worldwide ranked by ideXlab platform
Dong Wang - One of the best experts on this subject based on the ideXlab platform.
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effect of chemical treatments on transverse thermal conductivity of unidirectional abaca fiber epoxy composite
Composites Part A-applied Science and Manufacturing, 2014Co-Authors: Xiaozhe Zhang, Zhimao Yang, Hitoshi Takagi, Dong WangAbstract:Abstract Present paper investigated the effect of Mercerization and silane treatments on the transverse thermal conduction properties of unidirectional abaca fiber–epoxy composite fabricated by resin transfer molding. As indicated by FTIR, XRD and SEM, the changes in chemical composition, crystalline and lumen structure of abaca fibers were introduced by chemical treatments. Transverse tensile test showed that the weakest linkage of unidirectional composite changed from interface between abaca fiber bundle and epoxy resin for untreated abaca fiber to interface between elementary fibers treated by Mercerization and silanization. With the increasing of weakest linkages strength and the decreasing of void content, the transverse thermal conductivity (TCC) of the composite presents increasing trend. The changing of interfaces, cell wall and lumen derived from chemical treatments are the mainly factors affecting TTC. It was concluded that the abaca fiber composite with controllable transverse thermal conduction property can be designed by proper chemical treatment.
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effect of chemical treatments on transverse thermal conductivity of unidirectional abaca fiber epoxy composite part a applied science and manufacturing
Composites, 2014Co-Authors: Ke Liu, Zhimao Yang, Xiaozhe Zhang, Hitoshi Takagi, Dong WangAbstract:Present paper investigated the effect of Mercerization and silane treatments on the transverse thermal conduction properties of unidirectional abaca fiber–epoxy composite fabricated by resin transfer molding. As indicated by FTIR, XRD and SEM, the changes in chemical composition, crystalline and lumen structure of abaca fibers were introduced by chemical treatments. Transverse tensile test showed that the weakest linkage of unidirectional composite changed from interface between abaca fiber bundle and epoxy resin for untreated abaca fiber to interface between elementary fibers treated by Mercerization and silanization. With the increasing of weakest linkages strength and the decreasing of void content, the transverse thermal conductivity (TCC) of the composite presents increasing trend. The changing of interfaces, cell wall and lumen derived from chemical treatments are the mainly factors affecting TTC. It was concluded that the abaca fiber composite with controllable transverse thermal conduction property can be designed by proper chemical treatment.
Rubens Lincoln Santana Blazutti Marcal - One of the best experts on this subject based on the ideXlab platform.
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charpy impact test of epoxy composites reinforced with untreated and mercerized mallow fibers
Journal of materials research and technology, 2018Co-Authors: Lucio Fabio Cassiano Nascimento, Luis Henrique Leme Louro, Jheison Lopes Dos Santos, Fabio De Oliveira Braga, Sergio Neves Monteiro, Rubens Lincoln Santana Blazutti MarcalAbstract:Abstract The mallow fiber (Urena lobata, linn) is demonstrating a great potential as reinforcement in polymer matrix composites. The difficulty in the use of the mallow, as in other natural lignocellulosic fibers (NLFs), is its hydrophilic compatibility with polymeric matrices that are typically hydrophobic. In order to improve the adhesion between the fiber surface and polymeric matrices, mallow fibers were subjected to Mercerization treatment. In this work composites were produced with epoxy matrix reinforced with 30 vol% of mallow fibers, both untreated and mercerized. By means of XRD analysis it was verified the variation of crystallinity in fibers treated with different NaOH solutions as well as immersion times and agitation. After this XRD preliminary analysis, a treatment of 5% NaOH solution for 24 h without agitation was selected. The objective was to compare the Charpy impact energy of composites specimens produced with untreated mallow fibers and treated for the higher crystallinity obtained after the selected Mercerization. For the analysis of impact energy the Tukey test was applied from which it could be assured, with a confidence level of 95%, that the epoxy specimens reinforced with 30 vol% of untreated mallow fibers, had the best performance.
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Charpy impact test of epoxy composites reinforced with untreated and mercerized mallow fibers
'Elsevier BV', 2018Co-Authors: Lucio Fabio Cassiano Nascimento, Luis Henrique Leme Louro, Jheison Lopes Dos Santos, Fabio De Oliveira Braga, Sergio Neves Monteiro, Fernanda Santos Da Luz, Rubens Lincoln Santana Blazutti MarcalAbstract:The mallow fiber (Urena lobata, linn) is demonstrating a great potential as reinforcement in polymer matrix composites. The difficulty in the use of the mallow, as in other natural lignocellulosic fibers (NLFs), is its hydrophilic compatibility with polymeric matrices that are typically hydrophobic. In order to improve the adhesion between the fiber surface and polymeric matrices, mallow fibers were subjected to Mercerization treatment. In this work composites were produced with epoxy matrix reinforced with 30 vol% of mallow fibers, both untreated and mercerized. By means of XRD analysis it was verified the variation of crystallinity in fibers treated with different NaOH solutions as well as immersion times and agitation. After this XRD preliminary analysis, a treatment of 5% NaOH solution for 24 h without agitation was selected. The objective was to compare the Charpy impact energy of composites specimens produced with untreated mallow fibers and treated for the higher crystallinity obtained after the selected Mercerization. For the analysis of impact energy the Tukey test was applied from which it could be assured, with a confidence level of 95%, that the epoxy specimens reinforced with 30 vol% of untreated mallow fibers, had the best performance. Keywords: Mallow fibers, Epoxy composite, Mercerization, Charpy impact tes
Junji Ohgi - One of the best experts on this subject based on the ideXlab platform.
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Tensile and impact properties of fully green composites reinforced with mercerized ramie fibers
Journal of Materials Science, 2009Co-Authors: Naoki Suizu, Koichi Goda, Junji OhgiAbstract:The purpose of this study is to create a natural fiber-reinforced fully green composite with excellent toughness. By treating ramie plied yarns in a high concentration alkali solution, the reinforcements were mercerized. Results of tensile tests showed that unidirectional composites using mercerized ramie yarns exhibited two to three times larger fracture strain, without a marked decrease in strength, than composites using untreated yarns. In addition, Mercerization for the ramie yarns brings a better interfacial strength to the composites. Laminated composites using mercerized ramie yarns also showed approximately twice larger impact energy than composites using untreated yarns. Thus, Mercerization for natural fibers is expected for application to mechanical materials requiring a high toughness.
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improvement of plant based natural fibers for toughening green composites effect of load application during Mercerization of ramie fibers
Composites Part A-applied Science and Manufacturing, 2006Co-Authors: Koichi Goda, M S Sreekala, Alexandre Gomes, Takeshi Kaji, Junji OhgiAbstract:Abstract Effect of Mercerization to tensile properties of a ramie fiber was explored. Load application technique during Mercerization has been employed in order to improve mechanical properties of the fiber. A chemical treatment apparatus with tensile loading portion for applying monofilaments was newly developed. The ramie fiber was alkali-treated by 15% NaOH solution with applied loads of 0.049 and 0.098 N. The results showed that tensile strength of the treated ramie fiber was improved, 4–18% higher than that of the untreated ramie fiber, while Young’s modulus of the treated fibers decreased. It should be noted that fracture strains of the treated ramie fiber drastically increased to 0.045–0.072, that is, twice to three times higher than those of the untreated ramie fiber. It was considered that such property improvements upon Mercerization were correlated with change of morphological and chemical structures in microfibrils of the fiber. Finally, the plastic deformation behavior and fracture mechanism of the mercerized fibers under tensile loading process was explained using a schematic model.
Xiaozhe Zhang - One of the best experts on this subject based on the ideXlab platform.
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effect of chemical treatments on transverse thermal conductivity of unidirectional abaca fiber epoxy composite
Composites Part A-applied Science and Manufacturing, 2014Co-Authors: Xiaozhe Zhang, Zhimao Yang, Hitoshi Takagi, Dong WangAbstract:Abstract Present paper investigated the effect of Mercerization and silane treatments on the transverse thermal conduction properties of unidirectional abaca fiber–epoxy composite fabricated by resin transfer molding. As indicated by FTIR, XRD and SEM, the changes in chemical composition, crystalline and lumen structure of abaca fibers were introduced by chemical treatments. Transverse tensile test showed that the weakest linkage of unidirectional composite changed from interface between abaca fiber bundle and epoxy resin for untreated abaca fiber to interface between elementary fibers treated by Mercerization and silanization. With the increasing of weakest linkages strength and the decreasing of void content, the transverse thermal conductivity (TCC) of the composite presents increasing trend. The changing of interfaces, cell wall and lumen derived from chemical treatments are the mainly factors affecting TTC. It was concluded that the abaca fiber composite with controllable transverse thermal conduction property can be designed by proper chemical treatment.
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effect of chemical treatments on transverse thermal conductivity of unidirectional abaca fiber epoxy composite part a applied science and manufacturing
Composites, 2014Co-Authors: Ke Liu, Zhimao Yang, Xiaozhe Zhang, Hitoshi Takagi, Dong WangAbstract:Present paper investigated the effect of Mercerization and silane treatments on the transverse thermal conduction properties of unidirectional abaca fiber–epoxy composite fabricated by resin transfer molding. As indicated by FTIR, XRD and SEM, the changes in chemical composition, crystalline and lumen structure of abaca fibers were introduced by chemical treatments. Transverse tensile test showed that the weakest linkage of unidirectional composite changed from interface between abaca fiber bundle and epoxy resin for untreated abaca fiber to interface between elementary fibers treated by Mercerization and silanization. With the increasing of weakest linkages strength and the decreasing of void content, the transverse thermal conductivity (TCC) of the composite presents increasing trend. The changing of interfaces, cell wall and lumen derived from chemical treatments are the mainly factors affecting TTC. It was concluded that the abaca fiber composite with controllable transverse thermal conduction property can be designed by proper chemical treatment.
Hitoshi Takagi - One of the best experts on this subject based on the ideXlab platform.
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effect of chemical treatments on transverse thermal conductivity of unidirectional abaca fiber epoxy composite
Composites Part A-applied Science and Manufacturing, 2014Co-Authors: Xiaozhe Zhang, Zhimao Yang, Hitoshi Takagi, Dong WangAbstract:Abstract Present paper investigated the effect of Mercerization and silane treatments on the transverse thermal conduction properties of unidirectional abaca fiber–epoxy composite fabricated by resin transfer molding. As indicated by FTIR, XRD and SEM, the changes in chemical composition, crystalline and lumen structure of abaca fibers were introduced by chemical treatments. Transverse tensile test showed that the weakest linkage of unidirectional composite changed from interface between abaca fiber bundle and epoxy resin for untreated abaca fiber to interface between elementary fibers treated by Mercerization and silanization. With the increasing of weakest linkages strength and the decreasing of void content, the transverse thermal conductivity (TCC) of the composite presents increasing trend. The changing of interfaces, cell wall and lumen derived from chemical treatments are the mainly factors affecting TTC. It was concluded that the abaca fiber composite with controllable transverse thermal conduction property can be designed by proper chemical treatment.
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effect of chemical treatments on transverse thermal conductivity of unidirectional abaca fiber epoxy composite part a applied science and manufacturing
Composites, 2014Co-Authors: Ke Liu, Zhimao Yang, Xiaozhe Zhang, Hitoshi Takagi, Dong WangAbstract:Present paper investigated the effect of Mercerization and silane treatments on the transverse thermal conduction properties of unidirectional abaca fiber–epoxy composite fabricated by resin transfer molding. As indicated by FTIR, XRD and SEM, the changes in chemical composition, crystalline and lumen structure of abaca fibers were introduced by chemical treatments. Transverse tensile test showed that the weakest linkage of unidirectional composite changed from interface between abaca fiber bundle and epoxy resin for untreated abaca fiber to interface between elementary fibers treated by Mercerization and silanization. With the increasing of weakest linkages strength and the decreasing of void content, the transverse thermal conductivity (TCC) of the composite presents increasing trend. The changing of interfaces, cell wall and lumen derived from chemical treatments are the mainly factors affecting TTC. It was concluded that the abaca fiber composite with controllable transverse thermal conduction property can be designed by proper chemical treatment.