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Liqun Zhang - One of the best experts on this subject based on the ideXlab platform.
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preparation and performance of silica sbr Masterbatches with high silica loading by latex compounding method
Composites Part B-engineering, 2016Co-Authors: Yan Gui, Junchi Zheng, Dongli Han, Liqun ZhangAbstract:Abstract With the help of a new coupling agent Si747, silica water slurry and styrene–butadiene rubber (SBR) latex were successfully co-coagulated by the latex compounding method, even silica/SBR Masterbatches with silica loading as high as 200 phr could be prepared by such method. Compared to the traditional dry blending method, the latex compounding method had lower energy consumption during mixing and better silica dispersion in rubber matrix. Meanwhile, the effect of the amount of silica in the SBR latex on the properties of silica/SBR composites was investigated, and the results showed that the larger the amount of silica in the rubber matrix, the stronger the filler network. The performance of these composites was good and the dispersion of silica was relatively homogeneous. Furthermore, the Masterbatches with high silica loading were mixed with emulsion polymerized styrene–butadiene rubber (ESBR) or solution polymerized styrene–butadiene rubber (SSBR). The silica dispersed better in ESBR than in SSBR.
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Preparation and performance of silica/SBR Masterbatches with high silica loading by latex compounding method
Composites Part B: Engineering, 2016Co-Authors: Yan Gui, Junchi Zheng, Dongli Han, Liqun ZhangAbstract:Abstract With the help of a new coupling agent Si747, silica water slurry and styrene–butadiene rubber (SBR) latex were successfully co-coagulated by the latex compounding method, even silica/SBR Masterbatches with silica loading as high as 200 phr could be prepared by such method. Compared to the traditional dry blending method, the latex compounding method had lower energy consumption during mixing and better silica dispersion in rubber matrix. Meanwhile, the effect of the amount of silica in the SBR latex on the properties of silica/SBR composites was investigated, and the results showed that the larger the amount of silica in the rubber matrix, the stronger the filler network. The performance of these composites was good and the dispersion of silica was relatively homogeneous. Furthermore, the Masterbatches with high silica loading were mixed with emulsion polymerized styrene–butadiene rubber (ESBR) or solution polymerized styrene–butadiene rubber (SSBR). The silica dispersed better in ESBR than in SSBR.
Yan Gui - One of the best experts on this subject based on the ideXlab platform.
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preparation and performance of silica sbr Masterbatches with high silica loading by latex compounding method
Composites Part B-engineering, 2016Co-Authors: Yan Gui, Junchi Zheng, Dongli Han, Liqun ZhangAbstract:Abstract With the help of a new coupling agent Si747, silica water slurry and styrene–butadiene rubber (SBR) latex were successfully co-coagulated by the latex compounding method, even silica/SBR Masterbatches with silica loading as high as 200 phr could be prepared by such method. Compared to the traditional dry blending method, the latex compounding method had lower energy consumption during mixing and better silica dispersion in rubber matrix. Meanwhile, the effect of the amount of silica in the SBR latex on the properties of silica/SBR composites was investigated, and the results showed that the larger the amount of silica in the rubber matrix, the stronger the filler network. The performance of these composites was good and the dispersion of silica was relatively homogeneous. Furthermore, the Masterbatches with high silica loading were mixed with emulsion polymerized styrene–butadiene rubber (ESBR) or solution polymerized styrene–butadiene rubber (SSBR). The silica dispersed better in ESBR than in SSBR.
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Preparation and performance of silica/SBR Masterbatches with high silica loading by latex compounding method
Composites Part B: Engineering, 2016Co-Authors: Yan Gui, Junchi Zheng, Dongli Han, Liqun ZhangAbstract:Abstract With the help of a new coupling agent Si747, silica water slurry and styrene–butadiene rubber (SBR) latex were successfully co-coagulated by the latex compounding method, even silica/SBR Masterbatches with silica loading as high as 200 phr could be prepared by such method. Compared to the traditional dry blending method, the latex compounding method had lower energy consumption during mixing and better silica dispersion in rubber matrix. Meanwhile, the effect of the amount of silica in the SBR latex on the properties of silica/SBR composites was investigated, and the results showed that the larger the amount of silica in the rubber matrix, the stronger the filler network. The performance of these composites was good and the dispersion of silica was relatively homogeneous. Furthermore, the Masterbatches with high silica loading were mixed with emulsion polymerized styrene–butadiene rubber (ESBR) or solution polymerized styrene–butadiene rubber (SSBR). The silica dispersed better in ESBR than in SSBR.
Nittaya Rattanasom - One of the best experts on this subject based on the ideXlab platform.
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mechanical and electrical properties of natural rubber and nitrile rubber blends filled with multi wall carbon nanotube effect of preparation methods
Polymer Testing, 2013Co-Authors: Pattana Kueseng, Pongdhorn Saeoui, Nittaya RattanasomAbstract:Abstract Carbon nanotube (CNT)/NR Masterbatches prepared by predispersing and conventional methods were mixed with NBR for preparing CNT-filled 50/50 NR/NBR blends. The amount of CNT in the blends was varied from 0 to 6 phr. At a given CNT loading, hardness, modulus, tensile strength and tear strength of the blends containing the Masterbatches prepared by the predispersing method were significantly higher than those prepared by the conventional method. This was simply due to the better CNT dispersion in the blends. Additionally, dynamic mechanical results showed that the maximum tan δ of the vulcanizates containing the Masterbatches prepared by the predispersing method was lower than that of the corresponding conventional samples. This behaviour indicated the stronger reinforcing efficiency when the masterbatch prepared by the predispersing method was utilized. In addition, the volume resistivity of the P blends was lower than that of the corresponding C blend by about 2 orders of magnitude when only 2 phr of CNT was added. Moreover, thermal conductivity of the P blend having 4 phr of MWCNT was 1.7 times higher than that of the corresponding sample prepared by the conventional method.
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fumed and precipitated silica reinforced natural rubber composites prepared from latex system mechanical and dynamic properties
Polymer Testing, 2012Co-Authors: Sarawut Prasertsri, Nittaya RattanasomAbstract:Abstract Fumed silica (FSi) and precipitated silica (PSi) suspensions were used for preparing silica/natural rubber (NR) Masterbatches via a latex system. Then, both types of dried silica/NR masterbatch were mixed with other rubber chemicals on a two-roll mill. The results showed that well-dispersed FSi suspension could be prepared by either using the ultrasonic bath or agitator bead mill, while only the agitator bead mill could give well-dispersed PSi suspension. Also, the amount of silica loss in the Masterbatches was clearly less than in silica-filled NR prepared by using a conventional method, and the color of the uncompounded FSi/NR Masterbatches was lighter than that of the PSi/NR Masterbatches. Additionally, the compound viscosity, onset of crosslinking and stiffness of both FSi- and PSi-filled samples progressively increased when silica content was increased. FSi, having higher surface area, imparted the NR samples with higher viscosity and tear strength but, adversely, higher dynamic compression set, heat build-up and rolling resistance than the PSi. However, the beneficial reduction in compound viscosity, heat build-up, compression set, rolling resistance and increment in strength of both FSi- and PSi-filled samples could be achieved by adding bis-(3-triethoxysilylpropyl) tetrasulfide (Si-69). Also, the degree of improvement in dynamic properties after adding Si-69 was greater for the FSi/NR composite.
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Mechanical and damping properties of silica/natural rubber composites prepared from latex system
Polymer Testing, 2011Co-Authors: Sarawut Prasertsri, Nittaya RattanasomAbstract:Abstract In this research, a well-dispersed silica suspension was prepared by using a bead mill before adding into natural rubber (NR) latex for preparing silica/NR Masterbatches. The coagulated silica/NR Masterbatches with 10–30 parts of silica per hundred parts of rubber (phr) were mixed with other rubber chemicals on a two-roll mill. Cure characteristics, mechanical and damping properties of the vulcanizates prepared from the Masterbatches were compared with those prepared by a conventional method. The influence of silane coupling agent, bis-(3-triethoxysilylpropyl) tetrasulfide (Si-69), on the properties of the vulcanizates was also investigated. The results revealed that cure retardation, as typically seen in conventional silica-filled compounds, was not observed for the compounds prepared from silica/NR Masterbatches. Without Si-69, the silica/NR Masterbatches having more than 10 phr of silica exhibited the greater reinforcement compared to the corresponding conventional mixes. This was attributed to the better silica dispersion in silica/NR Masterbatches. Additionally, the masterbatch composite without silane exhibited comparable abrasion resistance, rolling resistance and heat build-up to those of the silane-filled conventional composite when silica loading was less than 30 phr. In the presence of Si-69, the masterbatch composites gave similar damping properties to those of the conventional composites at all silica loadings.
Christophe Detrembleur - One of the best experts on this subject based on the ideXlab platform.
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synthesis of polylactide clay nanocomposites by in situ intercalative polymerization in supercritical carbon dioxide
European Polymer Journal, 2009Co-Authors: Laetitia Urbanczyk, Michael Alexandre, Fred Ngoundjo, Christine Jerome, Christophe DetrembleurAbstract:Abstract Polylactide (PLA)/clay nanocomposites have been prepared by in situ ring-opening polymerization in supercritical carbon dioxide. Depending on the type of organoclay used, polylactide chains can be grafted onto the clay surface, leading to an exfoliated morphology. Nanocomposites with high clay contents (30–50 wt.%), called Masterbatches, have also been successfully prepared and were recovered as fine powders thanks to the unique properties of the supercritical fluid. Dilution of these Masterbatches into commercial l -polylactide by melt blending has led to essentially exfoliated nanocomposites containing 3 wt.% of clay. The mechanical properties of these materials have been assessed by flexion and impact tests. Significant improvements of stiffness and toughness have been observed for the PLA/clay nanocomposites compared to the pure matrix, together with improved impact resistance.
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Synthesis of polylactide/clay nanocomposites by in situ intercalative polymerization in supercritical carbon dioxide
European Polymer Journal, 2009Co-Authors: Laetitia Urbanczyk, Michael Alexandre, Fred Ngoundjo, Christine Jerome, Christophe Detrembleur, Cédric CalbergAbstract:Abstract Polylactide (PLA)/clay nanocomposites have been prepared by in situ ring-opening polymerization in supercritical carbon dioxide. Depending on the type of organoclay used, polylactide chains can be grafted onto the clay surface, leading to an exfoliated morphology. Nanocomposites with high clay contents (30–50 wt.%), called Masterbatches, have also been successfully prepared and were recovered as fine powders thanks to the unique properties of the supercritical fluid. Dilution of these Masterbatches into commercial l -polylactide by melt blending has led to essentially exfoliated nanocomposites containing 3 wt.% of clay. The mechanical properties of these materials have been assessed by flexion and impact tests. Significant improvements of stiffness and toughness have been observed for the PLA/clay nanocomposites compared to the pure matrix, together with improved impact resistance.
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Poly(caprolactone)/clay Masterbatches prepared in supercritical CO2 as efficient clay delamination promoters in poly(styrene-co-acrylonitrile)
Journal of Materials Chemistry, 2008Co-Authors: Laetitia Urbanczyk, Christine Jerome, Cédric Calberg, Samira Benali, Philippe Dubois, Serge Bourbigot, Eliane Espuche, Fabrice Gouanvé, Albert Germain, Christophe DetrembleurAbstract:Poly(styrene-co-acrylonitrile) (SAN)/clay nanocomposites with a high degree of clay exfoliation were prepared upon melt blending of pre-exfoliated poly(-caprolactone) (PCL)/organoclay Masterbatches in a Brabender-type internal mixer. These highly filled Masterbatches were synthesized by a one-pot process using supercritical carbon dioxide as a polymerization medium. During their dispersion into SAN, PCL is expected to act as a compatibilizer at the polymer–clay interface as it is miscible with the host matrix under these conditions. Reference nanocomposites based on direct melt mixing of the commercial organoclay were also prepared for the sake of comparison. The superiority of the masterbatch route in term of clay delamination efficiency has been evidenced by XRD analysis, visual and TEM observations. The effect of the nanocomposite morphology on the polymer properties was then investigated. A substantial improvement of the fire behaviour and a decrease in gas permeability have been observed for the nanocomposite containing the highest level of clay exfoliation, accompanied with a higher brittleness as evidenced by traction and impact tests.
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Poly(caprolactone)/clay Masterbatches prepared in supercritical CO2 as efficient clay delamination promoters in poly(styrene-co-acrylonitrile)
Journal of Materials Chemistry, 2008Co-Authors: Laetitia Urbanczyk, Christine Jerome, Cédric Calberg, Samira Benali, Philippe Dubois, Serge Bourbigot, Eliane Espuche, Fabrice Gouanvé, Albert Germain, Christophe DetrembleurAbstract:Poly(styrene-co-acrylonitrile) (SAN)/clay nanocomposites with a high degree of clay exfoliation were prepared upon melt blending of pre-exfoliated poly(e-caprolactone) (PCL)/organoclay Masterbatches in a Brabender-type internal mixer. These highly filled Masterbatches were synthesized by a one-pot process using supercritical carbon dioxide as a polymerization medium. During their dispersion into SAN, PCL is expected to act as a compatibilizer at the polymer–clay interface as it is miscible with the host matrix under these conditions. Reference nanocomposites based on direct melt mixing of the commercial organoclay were also prepared for the sake of comparison. The superiority of the masterbatch route in term of clay delamination efficiency has been evidenced by XRD analysis, visual and TEM observations. The effect of the nanocomposite morphology on the polymer properties was then investigated. A substantial improvement of the fire behaviour and a decrease in gas permeability have been observed for the nanocomposite containing the highest level of clay exfoliation, accompanied with a higher brittleness as evidenced by traction and impact tests.
Laetitia Urbanczyk - One of the best experts on this subject based on the ideXlab platform.
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synthesis of polylactide clay nanocomposites by in situ intercalative polymerization in supercritical carbon dioxide
European Polymer Journal, 2009Co-Authors: Laetitia Urbanczyk, Michael Alexandre, Fred Ngoundjo, Christine Jerome, Christophe DetrembleurAbstract:Abstract Polylactide (PLA)/clay nanocomposites have been prepared by in situ ring-opening polymerization in supercritical carbon dioxide. Depending on the type of organoclay used, polylactide chains can be grafted onto the clay surface, leading to an exfoliated morphology. Nanocomposites with high clay contents (30–50 wt.%), called Masterbatches, have also been successfully prepared and were recovered as fine powders thanks to the unique properties of the supercritical fluid. Dilution of these Masterbatches into commercial l -polylactide by melt blending has led to essentially exfoliated nanocomposites containing 3 wt.% of clay. The mechanical properties of these materials have been assessed by flexion and impact tests. Significant improvements of stiffness and toughness have been observed for the PLA/clay nanocomposites compared to the pure matrix, together with improved impact resistance.
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Synthesis of polylactide/clay nanocomposites by in situ intercalative polymerization in supercritical carbon dioxide
European Polymer Journal, 2009Co-Authors: Laetitia Urbanczyk, Michael Alexandre, Fred Ngoundjo, Christine Jerome, Christophe Detrembleur, Cédric CalbergAbstract:Abstract Polylactide (PLA)/clay nanocomposites have been prepared by in situ ring-opening polymerization in supercritical carbon dioxide. Depending on the type of organoclay used, polylactide chains can be grafted onto the clay surface, leading to an exfoliated morphology. Nanocomposites with high clay contents (30–50 wt.%), called Masterbatches, have also been successfully prepared and were recovered as fine powders thanks to the unique properties of the supercritical fluid. Dilution of these Masterbatches into commercial l -polylactide by melt blending has led to essentially exfoliated nanocomposites containing 3 wt.% of clay. The mechanical properties of these materials have been assessed by flexion and impact tests. Significant improvements of stiffness and toughness have been observed for the PLA/clay nanocomposites compared to the pure matrix, together with improved impact resistance.
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Poly(caprolactone)/clay Masterbatches prepared in supercritical CO2 as efficient clay delamination promoters in poly(styrene-co-acrylonitrile)
Journal of Materials Chemistry, 2008Co-Authors: Laetitia Urbanczyk, Christine Jerome, Cédric Calberg, Samira Benali, Philippe Dubois, Serge Bourbigot, Eliane Espuche, Fabrice Gouanvé, Albert Germain, Christophe DetrembleurAbstract:Poly(styrene-co-acrylonitrile) (SAN)/clay nanocomposites with a high degree of clay exfoliation were prepared upon melt blending of pre-exfoliated poly(-caprolactone) (PCL)/organoclay Masterbatches in a Brabender-type internal mixer. These highly filled Masterbatches were synthesized by a one-pot process using supercritical carbon dioxide as a polymerization medium. During their dispersion into SAN, PCL is expected to act as a compatibilizer at the polymer–clay interface as it is miscible with the host matrix under these conditions. Reference nanocomposites based on direct melt mixing of the commercial organoclay were also prepared for the sake of comparison. The superiority of the masterbatch route in term of clay delamination efficiency has been evidenced by XRD analysis, visual and TEM observations. The effect of the nanocomposite morphology on the polymer properties was then investigated. A substantial improvement of the fire behaviour and a decrease in gas permeability have been observed for the nanocomposite containing the highest level of clay exfoliation, accompanied with a higher brittleness as evidenced by traction and impact tests.
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Poly(caprolactone)/clay Masterbatches prepared in supercritical CO2 as efficient clay delamination promoters in poly(styrene-co-acrylonitrile)
Journal of Materials Chemistry, 2008Co-Authors: Laetitia Urbanczyk, Christine Jerome, Cédric Calberg, Samira Benali, Philippe Dubois, Serge Bourbigot, Eliane Espuche, Fabrice Gouanvé, Albert Germain, Christophe DetrembleurAbstract:Poly(styrene-co-acrylonitrile) (SAN)/clay nanocomposites with a high degree of clay exfoliation were prepared upon melt blending of pre-exfoliated poly(e-caprolactone) (PCL)/organoclay Masterbatches in a Brabender-type internal mixer. These highly filled Masterbatches were synthesized by a one-pot process using supercritical carbon dioxide as a polymerization medium. During their dispersion into SAN, PCL is expected to act as a compatibilizer at the polymer–clay interface as it is miscible with the host matrix under these conditions. Reference nanocomposites based on direct melt mixing of the commercial organoclay were also prepared for the sake of comparison. The superiority of the masterbatch route in term of clay delamination efficiency has been evidenced by XRD analysis, visual and TEM observations. The effect of the nanocomposite morphology on the polymer properties was then investigated. A substantial improvement of the fire behaviour and a decrease in gas permeability have been observed for the nanocomposite containing the highest level of clay exfoliation, accompanied with a higher brittleness as evidenced by traction and impact tests.