The Experts below are selected from a list of 1755 Experts worldwide ranked by ideXlab platform
Hexin Zhang - One of the best experts on this subject based on the ideXlab platform.
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preparation of octadecylamine graphene mgcl supported ziegler Natta Catalyst and its application in ethylene polymerization
Journal of Nanoscience and Nanotechnology, 2018Co-Authors: Hao Zhang, Hexin Zhang, Jaehyeong Park, Youngkwon Moon, Xuequan Zhang, Jingsheng Liu, Byeongkwang Shin, Keunbyoung YoonAbstract:A facile coagglomeration method for preparing a long alkyl chain modified graphene oxide (MGO)/MgCl2-supported Ti-based Ziegler-Natta Catalyst was reported. The effects of MGO on the Catalyst morphology and activity for ethylene polymerization were examined. The resultant polyethylene (PE)/MGO nanocomposites exhibited a layered morphology, with the MGO fillers being well dispersed and exhibiting strong interfacial adhesion to the PE matrix. The thermal stability and mechanical properties of the PE were significantly enhanced with the introduction of a small amount of the MGO filler. Thus, this work provides a facile approach to the production of high-performance PE.
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synthesis of polyethylene exfoliated mos2 nanocomposites by in situ exfoliation polymerization using ziegler Natta Catalyst intercalated mos2
RSC Advances, 2017Co-Authors: Hao Zhang, Hexin Zhang, Keunbyoung YoonAbstract:A new synthetic route for polyethylene (PE)/exfoliated MoS2 (EMoS2) nanocomposites using novel Ziegler–Natta Catalyst intercalated MoS2 was designed. The Catalyst was synthesized by the intercalation of MoS2 with a Grignard reagent, followed by anchoring of TiCl4 into the MoS2 galleries. The intercalated MoS2 was exfoliated to form PE/EMoS2 nanocomposites during in situ ethylene polymerization. The resultant PE/EMoS2 nanocomposites had a layered morphology, and they were well dispersed in the PE matrix. In addition, the thermal stability and mechanical properties of PE were significantly enhanced with the introduction of EMoS2. Thus, this work provides a facile approach to the production of PE/EMoS2 nanocomposites.
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preparation of polyethylene graphene nanocomposites with octadecylamine modified graphene oxide mgcl supported ziegler Natta Catalyst
Journal of Polymer Science Part A, 2017Co-Authors: Hexin Zhang, Jaehyeong Park, Youngkwon Moon, Xuequan Zhang, Ko Eunbin, Keunbyoung YoonAbstract:In this work, an octadecylamine-modified graphene oxide (ODA-GO)-MgCl-supported Ziegler–Natta Catalyst was synthesized by reacting ODA-GO with a Grignard reagent, followed by anchoring TiCl4 to the structure. The effect of the ODA-GO on the Catalyst morphology and ethylene polymerization behavior was examined. The resultant polyethylene (PE)/ODA-GO nanocomposites directly mirrored the Catalyst morphology by forming a layered morphology, and the ODA-GO fillers were well dispersed in the PE matrix and showed strong interfacial adhesion with it. The resultant PE/ODA-GO nanocomposites exhibited better thermal stability and mechanical properties than neat PE, even with a small amount of ODA-GO added. Thus, this work provides a facile approach to the production of high-performance PE. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017, 55, 855–860
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preparation and properties of pe mos2 nanocomposites with an exfoliated mos2 mgcl2 supported ziegler Natta Catalyst via an in situ polymerization
Composites Part A-applied Science and Manufacturing, 2017Co-Authors: Hexin Zhang, Jaehyeong Park, Youngkwon Moon, Xuequan Zhang, Keunbyoung YoonAbstract:Abstract Here, we report the first example of preparation of polyethylene (PE)/exfoliated-MoS 2 nanocomposites through in-situ Ziegler-Natta polymerization. The exfoliated - MoS 2 /MgCl 2 -supported Ti-based Ziegler–Natta Catalyst was synthesized via a facile coagglomeration method. The effects of MoS 2 on the Catalyst morphology and the ethylene polymerization behavior were examined. The resultant PE/MoS 2 nanocomposites had a flake shape morphology, and the MoS 2 fillers were well dispersed throughout the entire PE matrix. In addition, the thermal stability and mechanical properties of the PE base material were significantly enhanced by the introduction of a very small amount of the MoS 2 filler (0.08 wt%). Therefore, this work provides a facile method to produce of high-performance PE.
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preparation and properties of polyethylene dodecanethiol mos2 nanocomposites with dodecanethiol mos2 mgcl2 supported ziegler Natta Catalyst via an in situ polymerization method
Polymer, 2017Co-Authors: Hexin Zhang, Jaehyeong Park, Youngkwon Moon, Xuequan Zhang, Byungsik Park, Keunbyoung YoonAbstract:Abstract The dodecanethiol-modified molybdenum disulfide (OMoS 2 ) was used as template to form a layered OMoS 2 MgCl 2 -supported Ziegler–Natta Catalyst via a co-agglomeration method. The effects of OMoS 2 on the Catalyst morphology and ethylene polymerization behavior were examined. The resultant polyethylene (PE)/OMoS 2 nanocomposites mirrored the Catalyst morphology, and the OMoS 2 fillers were well dispersed in the PE matrix. In addition, the thermal stability and mechanical properties of PE were significantly enhanced by the introduction of very small amounts of OMoS 2 filler. This enhancement resulted from the good dispersion and interface adhesion of OMoS 2 and the PE matrix. Thus, this work proposes a new method for the production of high-performance PE.
Keunbyoung Yoon - One of the best experts on this subject based on the ideXlab platform.
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preparation of octadecylamine graphene mgcl supported ziegler Natta Catalyst and its application in ethylene polymerization
Journal of Nanoscience and Nanotechnology, 2018Co-Authors: Hao Zhang, Hexin Zhang, Jaehyeong Park, Youngkwon Moon, Xuequan Zhang, Jingsheng Liu, Byeongkwang Shin, Keunbyoung YoonAbstract:A facile coagglomeration method for preparing a long alkyl chain modified graphene oxide (MGO)/MgCl2-supported Ti-based Ziegler-Natta Catalyst was reported. The effects of MGO on the Catalyst morphology and activity for ethylene polymerization were examined. The resultant polyethylene (PE)/MGO nanocomposites exhibited a layered morphology, with the MGO fillers being well dispersed and exhibiting strong interfacial adhesion to the PE matrix. The thermal stability and mechanical properties of the PE were significantly enhanced with the introduction of a small amount of the MGO filler. Thus, this work provides a facile approach to the production of high-performance PE.
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synthesis of polyethylene exfoliated mos2 nanocomposites by in situ exfoliation polymerization using ziegler Natta Catalyst intercalated mos2
RSC Advances, 2017Co-Authors: Hao Zhang, Hexin Zhang, Keunbyoung YoonAbstract:A new synthetic route for polyethylene (PE)/exfoliated MoS2 (EMoS2) nanocomposites using novel Ziegler–Natta Catalyst intercalated MoS2 was designed. The Catalyst was synthesized by the intercalation of MoS2 with a Grignard reagent, followed by anchoring of TiCl4 into the MoS2 galleries. The intercalated MoS2 was exfoliated to form PE/EMoS2 nanocomposites during in situ ethylene polymerization. The resultant PE/EMoS2 nanocomposites had a layered morphology, and they were well dispersed in the PE matrix. In addition, the thermal stability and mechanical properties of PE were significantly enhanced with the introduction of EMoS2. Thus, this work provides a facile approach to the production of PE/EMoS2 nanocomposites.
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preparation of polyethylene graphene nanocomposites with octadecylamine modified graphene oxide mgcl supported ziegler Natta Catalyst
Journal of Polymer Science Part A, 2017Co-Authors: Hexin Zhang, Jaehyeong Park, Youngkwon Moon, Xuequan Zhang, Ko Eunbin, Keunbyoung YoonAbstract:In this work, an octadecylamine-modified graphene oxide (ODA-GO)-MgCl-supported Ziegler–Natta Catalyst was synthesized by reacting ODA-GO with a Grignard reagent, followed by anchoring TiCl4 to the structure. The effect of the ODA-GO on the Catalyst morphology and ethylene polymerization behavior was examined. The resultant polyethylene (PE)/ODA-GO nanocomposites directly mirrored the Catalyst morphology by forming a layered morphology, and the ODA-GO fillers were well dispersed in the PE matrix and showed strong interfacial adhesion with it. The resultant PE/ODA-GO nanocomposites exhibited better thermal stability and mechanical properties than neat PE, even with a small amount of ODA-GO added. Thus, this work provides a facile approach to the production of high-performance PE. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017, 55, 855–860
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preparation and properties of pe mos2 nanocomposites with an exfoliated mos2 mgcl2 supported ziegler Natta Catalyst via an in situ polymerization
Composites Part A-applied Science and Manufacturing, 2017Co-Authors: Hexin Zhang, Jaehyeong Park, Youngkwon Moon, Xuequan Zhang, Keunbyoung YoonAbstract:Abstract Here, we report the first example of preparation of polyethylene (PE)/exfoliated-MoS 2 nanocomposites through in-situ Ziegler-Natta polymerization. The exfoliated - MoS 2 /MgCl 2 -supported Ti-based Ziegler–Natta Catalyst was synthesized via a facile coagglomeration method. The effects of MoS 2 on the Catalyst morphology and the ethylene polymerization behavior were examined. The resultant PE/MoS 2 nanocomposites had a flake shape morphology, and the MoS 2 fillers were well dispersed throughout the entire PE matrix. In addition, the thermal stability and mechanical properties of the PE base material were significantly enhanced by the introduction of a very small amount of the MoS 2 filler (0.08 wt%). Therefore, this work provides a facile method to produce of high-performance PE.
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preparation and properties of polyethylene dodecanethiol mos2 nanocomposites with dodecanethiol mos2 mgcl2 supported ziegler Natta Catalyst via an in situ polymerization method
Polymer, 2017Co-Authors: Hexin Zhang, Jaehyeong Park, Youngkwon Moon, Xuequan Zhang, Byungsik Park, Keunbyoung YoonAbstract:Abstract The dodecanethiol-modified molybdenum disulfide (OMoS 2 ) was used as template to form a layered OMoS 2 MgCl 2 -supported Ziegler–Natta Catalyst via a co-agglomeration method. The effects of OMoS 2 on the Catalyst morphology and ethylene polymerization behavior were examined. The resultant polyethylene (PE)/OMoS 2 nanocomposites mirrored the Catalyst morphology, and the OMoS 2 fillers were well dispersed in the PE matrix. In addition, the thermal stability and mechanical properties of PE were significantly enhanced by the introduction of very small amounts of OMoS 2 filler. This enhancement resulted from the good dispersion and interface adhesion of OMoS 2 and the PE matrix. Thus, this work proposes a new method for the production of high-performance PE.
Toshiaki Taniike - One of the best experts on this subject based on the ideXlab platform.
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machine learning aided structure determination for ticl4 capped mgcl2 nanoplate of heterogeneous ziegler Natta Catalyst
ACS Catalysis, 2019Co-Authors: Gentoku Takasao, Minoru Terano, Toru Wada, Ashutosh Thakur, Patchanee Chammingkwan, Toshiaki TaniikeAbstract:Dynamic reconstruction under a physicochemical environment is an intrinsic property of solid surfaces, in particular when associated with catalysis on nanosized or nanostructured materials. Here, we report nonempirical structure determination of TiCl4-capped MgCl2 nanoplates that is based on the combination of a genetic algorithm and density functional calculations. The methodology for the nonempirical structure determination was developed, and its application was demonstrated for 7MgCl2, 15MgCl2, and 15MgCl2/4TiCl4 in relation to the hidden identity of primary particles of the Ziegler–Natta Catalyst. Bare MgCl2 nanoplates dominantly exposed {100} surfaces at their lateral cuts, but the chemisorption of TiCl4 induced reconstruction by stabilizing {110} surfaces. The most important finding of the present research is that TiCl4 exhibited distributed adsorption states as consequences of chemisorption on nonideal finite surfaces and the diversity of thermodynamically accessible structures. The assessment of t...
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Machine Learning-Aided Structure Determination for TiCl4–Capped MgCl2 Nanoplate of Heterogeneous Ziegler–Natta Catalyst
2019Co-Authors: Gentoku Takasao, Minoru Terano, Toru Wada, Ashutosh Thakur, Patchanee Chammingkwan, Toshiaki TaniikeAbstract:Dynamic reconstruction under a physicochemical environment is an intrinsic property of solid surfaces, in particular when associated with catalysis on nanosized or nanostructured materials. Here, we report nonempirical structure determination of TiCl4-capped MgCl2 nanoplates that is based on the combination of a genetic algorithm and density functional calculations. The methodology for the nonempirical structure determination was developed, and its application was demonstrated for 7MgCl2, 15MgCl2, and 15MgCl2/4TiCl4 in relation to the hidden identity of primary particles of the Ziegler–Natta Catalyst. Bare MgCl2 nanoplates dominantly exposed {100} surfaces at their lateral cuts, but the chemisorption of TiCl4 induced reconstruction by stabilizing {110} surfaces. The most important finding of the present research is that TiCl4 exhibited distributed adsorption states as consequences of chemisorption on nonideal finite surfaces and the diversity of thermodynamically accessible structures. The assessment of the Ti distribution is essential for the distribution of primary structures of produced polymer, and in this study, we made these determinations
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initiation of oxidative degradation in polypropylene reactor powder produced by ziegler Natta Catalyst
Polymer Degradation and Stability, 2017Co-Authors: Taira Tobita, Patchanee Chammingkwan, Minoru Terano, Toshiaki TaniikeAbstract:Abstract The oxidative degradation of polypropylene reactor powder was studied to clarify the origin of initial radicals that trigger auto-oxidation. Polymerization conditions were found to have direct impacts on the stability of as-synthesized polymer irrespective of Catalyst residues and polymer structures. Polypropylene produced under a higher yield condition exhibited a shorter lifetime with a larger amount of oxidative products after air exposure, suggesting the presence of a larger amount of initial radicals. The addition of a nitroxide radical trapping agent drastically enhanced the stability of as-synthesized polymer by passivating the initially formed radicals. Different experimentation approaches revealed that initial radicals are plausibly formed in polymerization.
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understanding the chemical and physical transformations of a ziegler Natta Catalyst at the initial stage of polymerization kinetics the key role of alkylaluminum in the Catalyst activation process
Macromolecular Chemistry and Physics, 2014Co-Authors: Sumant Dwivedi, Toshiaki Taniike, Minoru TeranoAbstract:An improved stopped-flow (SF) technique is employed to clarify the origin of kinetics in propylene polymerization with a Mg(OEt)2-based Ziegler–Natta Catalyst. Polymerization in the range of 0.1–5 s exhibits a kinetic transition from a linear development to a build-up-type development of the yield. It is found that a lower alkylaluminum concentration leads to a lower activity in the linear regime, whereas the extent of the activation becomes greater in the build-up regime. The origin of these kinetic behaviors is studied using scanning electron microscopy (SEM) for Catalyst/polymer particles and cross-fractionation analyses for polymer structures. It is found that the kinetic transition mainly arises from the fragmentation of the Catalyst particles and resultant increase in the active site concentration. The fragmentation manner strongly depends on the alkylaluminum concentration, which affects not only the amount, but also the placement of initial polymer formation. The nature of the active sites varies as a result of an aging effect with alkylaluminum: their stereospecificity, propagation rate constant, and tolerance for chain transfer reaction increase as the polymerization progresses.
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mgo mgcl 2 ticl 4 core shell Catalyst for establishing structure performance relationship in ziegler Natta olefin polymerization
Topics in Catalysis, 2014Co-Authors: Patchanee Chammingkwan, Minoru Terano, Vu Quoc Thang, Toshiaki TaniikeAbstract:Recently we successfully established the first structure–performance relationships between the Catalyst surface area and propylene polymerization activity using novel MgO/MgCl2/TiCl4 core–shell Catalysts with non-porous and non-fragmentable features. In the present paper, we have addressed the physical and chemical natures of these novel model Catalysts in comparison with typical Ziegler–Natta Catalysts, by means of comprehensive characterization and analyses. It was clarified that the MgO/MgCl2/TiCl4 core–shell Catalysts offer an ideal and powerful tool to address relationships between the support architectures and polymerization performance, which had been long un-clarified. Unique structure of MgO/MgCl2/TiCl4 core–shell Catalysts but yet identical surface chemistry with typical Ziegler–Natta Catalyst offers an ideal and powerful tool to address relationships between the support architectures and polymerization performance.
Minoru Terano - One of the best experts on this subject based on the ideXlab platform.
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machine learning aided structure determination for ticl4 capped mgcl2 nanoplate of heterogeneous ziegler Natta Catalyst
ACS Catalysis, 2019Co-Authors: Gentoku Takasao, Minoru Terano, Toru Wada, Ashutosh Thakur, Patchanee Chammingkwan, Toshiaki TaniikeAbstract:Dynamic reconstruction under a physicochemical environment is an intrinsic property of solid surfaces, in particular when associated with catalysis on nanosized or nanostructured materials. Here, we report nonempirical structure determination of TiCl4-capped MgCl2 nanoplates that is based on the combination of a genetic algorithm and density functional calculations. The methodology for the nonempirical structure determination was developed, and its application was demonstrated for 7MgCl2, 15MgCl2, and 15MgCl2/4TiCl4 in relation to the hidden identity of primary particles of the Ziegler–Natta Catalyst. Bare MgCl2 nanoplates dominantly exposed {100} surfaces at their lateral cuts, but the chemisorption of TiCl4 induced reconstruction by stabilizing {110} surfaces. The most important finding of the present research is that TiCl4 exhibited distributed adsorption states as consequences of chemisorption on nonideal finite surfaces and the diversity of thermodynamically accessible structures. The assessment of t...
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Machine Learning-Aided Structure Determination for TiCl4–Capped MgCl2 Nanoplate of Heterogeneous Ziegler–Natta Catalyst
2019Co-Authors: Gentoku Takasao, Minoru Terano, Toru Wada, Ashutosh Thakur, Patchanee Chammingkwan, Toshiaki TaniikeAbstract:Dynamic reconstruction under a physicochemical environment is an intrinsic property of solid surfaces, in particular when associated with catalysis on nanosized or nanostructured materials. Here, we report nonempirical structure determination of TiCl4-capped MgCl2 nanoplates that is based on the combination of a genetic algorithm and density functional calculations. The methodology for the nonempirical structure determination was developed, and its application was demonstrated for 7MgCl2, 15MgCl2, and 15MgCl2/4TiCl4 in relation to the hidden identity of primary particles of the Ziegler–Natta Catalyst. Bare MgCl2 nanoplates dominantly exposed {100} surfaces at their lateral cuts, but the chemisorption of TiCl4 induced reconstruction by stabilizing {110} surfaces. The most important finding of the present research is that TiCl4 exhibited distributed adsorption states as consequences of chemisorption on nonideal finite surfaces and the diversity of thermodynamically accessible structures. The assessment of the Ti distribution is essential for the distribution of primary structures of produced polymer, and in this study, we made these determinations
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initiation of oxidative degradation in polypropylene reactor powder produced by ziegler Natta Catalyst
Polymer Degradation and Stability, 2017Co-Authors: Taira Tobita, Patchanee Chammingkwan, Minoru Terano, Toshiaki TaniikeAbstract:Abstract The oxidative degradation of polypropylene reactor powder was studied to clarify the origin of initial radicals that trigger auto-oxidation. Polymerization conditions were found to have direct impacts on the stability of as-synthesized polymer irrespective of Catalyst residues and polymer structures. Polypropylene produced under a higher yield condition exhibited a shorter lifetime with a larger amount of oxidative products after air exposure, suggesting the presence of a larger amount of initial radicals. The addition of a nitroxide radical trapping agent drastically enhanced the stability of as-synthesized polymer by passivating the initially formed radicals. Different experimentation approaches revealed that initial radicals are plausibly formed in polymerization.
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understanding the chemical and physical transformations of a ziegler Natta Catalyst at the initial stage of polymerization kinetics the key role of alkylaluminum in the Catalyst activation process
Macromolecular Chemistry and Physics, 2014Co-Authors: Sumant Dwivedi, Toshiaki Taniike, Minoru TeranoAbstract:An improved stopped-flow (SF) technique is employed to clarify the origin of kinetics in propylene polymerization with a Mg(OEt)2-based Ziegler–Natta Catalyst. Polymerization in the range of 0.1–5 s exhibits a kinetic transition from a linear development to a build-up-type development of the yield. It is found that a lower alkylaluminum concentration leads to a lower activity in the linear regime, whereas the extent of the activation becomes greater in the build-up regime. The origin of these kinetic behaviors is studied using scanning electron microscopy (SEM) for Catalyst/polymer particles and cross-fractionation analyses for polymer structures. It is found that the kinetic transition mainly arises from the fragmentation of the Catalyst particles and resultant increase in the active site concentration. The fragmentation manner strongly depends on the alkylaluminum concentration, which affects not only the amount, but also the placement of initial polymer formation. The nature of the active sites varies as a result of an aging effect with alkylaluminum: their stereospecificity, propagation rate constant, and tolerance for chain transfer reaction increase as the polymerization progresses.
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mgo mgcl 2 ticl 4 core shell Catalyst for establishing structure performance relationship in ziegler Natta olefin polymerization
Topics in Catalysis, 2014Co-Authors: Patchanee Chammingkwan, Minoru Terano, Vu Quoc Thang, Toshiaki TaniikeAbstract:Recently we successfully established the first structure–performance relationships between the Catalyst surface area and propylene polymerization activity using novel MgO/MgCl2/TiCl4 core–shell Catalysts with non-porous and non-fragmentable features. In the present paper, we have addressed the physical and chemical natures of these novel model Catalysts in comparison with typical Ziegler–Natta Catalysts, by means of comprehensive characterization and analyses. It was clarified that the MgO/MgCl2/TiCl4 core–shell Catalysts offer an ideal and powerful tool to address relationships between the support architectures and polymerization performance, which had been long un-clarified. Unique structure of MgO/MgCl2/TiCl4 core–shell Catalysts but yet identical surface chemistry with typical Ziegler–Natta Catalyst offers an ideal and powerful tool to address relationships between the support architectures and polymerization performance.
Xuequan Zhang - One of the best experts on this subject based on the ideXlab platform.
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preparation of octadecylamine graphene mgcl supported ziegler Natta Catalyst and its application in ethylene polymerization
Journal of Nanoscience and Nanotechnology, 2018Co-Authors: Hao Zhang, Hexin Zhang, Jaehyeong Park, Youngkwon Moon, Xuequan Zhang, Jingsheng Liu, Byeongkwang Shin, Keunbyoung YoonAbstract:A facile coagglomeration method for preparing a long alkyl chain modified graphene oxide (MGO)/MgCl2-supported Ti-based Ziegler-Natta Catalyst was reported. The effects of MGO on the Catalyst morphology and activity for ethylene polymerization were examined. The resultant polyethylene (PE)/MGO nanocomposites exhibited a layered morphology, with the MGO fillers being well dispersed and exhibiting strong interfacial adhesion to the PE matrix. The thermal stability and mechanical properties of the PE were significantly enhanced with the introduction of a small amount of the MGO filler. Thus, this work provides a facile approach to the production of high-performance PE.
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preparation of polyethylene graphene nanocomposites with octadecylamine modified graphene oxide mgcl supported ziegler Natta Catalyst
Journal of Polymer Science Part A, 2017Co-Authors: Hexin Zhang, Jaehyeong Park, Youngkwon Moon, Xuequan Zhang, Ko Eunbin, Keunbyoung YoonAbstract:In this work, an octadecylamine-modified graphene oxide (ODA-GO)-MgCl-supported Ziegler–Natta Catalyst was synthesized by reacting ODA-GO with a Grignard reagent, followed by anchoring TiCl4 to the structure. The effect of the ODA-GO on the Catalyst morphology and ethylene polymerization behavior was examined. The resultant polyethylene (PE)/ODA-GO nanocomposites directly mirrored the Catalyst morphology by forming a layered morphology, and the ODA-GO fillers were well dispersed in the PE matrix and showed strong interfacial adhesion with it. The resultant PE/ODA-GO nanocomposites exhibited better thermal stability and mechanical properties than neat PE, even with a small amount of ODA-GO added. Thus, this work provides a facile approach to the production of high-performance PE. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017, 55, 855–860
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preparation and properties of pe mos2 nanocomposites with an exfoliated mos2 mgcl2 supported ziegler Natta Catalyst via an in situ polymerization
Composites Part A-applied Science and Manufacturing, 2017Co-Authors: Hexin Zhang, Jaehyeong Park, Youngkwon Moon, Xuequan Zhang, Keunbyoung YoonAbstract:Abstract Here, we report the first example of preparation of polyethylene (PE)/exfoliated-MoS 2 nanocomposites through in-situ Ziegler-Natta polymerization. The exfoliated - MoS 2 /MgCl 2 -supported Ti-based Ziegler–Natta Catalyst was synthesized via a facile coagglomeration method. The effects of MoS 2 on the Catalyst morphology and the ethylene polymerization behavior were examined. The resultant PE/MoS 2 nanocomposites had a flake shape morphology, and the MoS 2 fillers were well dispersed throughout the entire PE matrix. In addition, the thermal stability and mechanical properties of the PE base material were significantly enhanced by the introduction of a very small amount of the MoS 2 filler (0.08 wt%). Therefore, this work provides a facile method to produce of high-performance PE.
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preparation and properties of polyethylene dodecanethiol mos2 nanocomposites with dodecanethiol mos2 mgcl2 supported ziegler Natta Catalyst via an in situ polymerization method
Polymer, 2017Co-Authors: Hexin Zhang, Jaehyeong Park, Youngkwon Moon, Xuequan Zhang, Byungsik Park, Keunbyoung YoonAbstract:Abstract The dodecanethiol-modified molybdenum disulfide (OMoS 2 ) was used as template to form a layered OMoS 2 MgCl 2 -supported Ziegler–Natta Catalyst via a co-agglomeration method. The effects of OMoS 2 on the Catalyst morphology and ethylene polymerization behavior were examined. The resultant polyethylene (PE)/OMoS 2 nanocomposites mirrored the Catalyst morphology, and the OMoS 2 fillers were well dispersed in the PE matrix. In addition, the thermal stability and mechanical properties of PE were significantly enhanced by the introduction of very small amounts of OMoS 2 filler. This enhancement resulted from the good dispersion and interface adhesion of OMoS 2 and the PE matrix. Thus, this work proposes a new method for the production of high-performance PE.
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fabrication of polyethylene mos2 nanocomposites using a novel exfoliated mos2 mgcl bi supported ziegler Natta Catalyst via in situ polymerization
Composites Science and Technology, 2016Co-Authors: Hexin Zhang, Jaehyeong Park, Youngkwon Moon, Xuequan Zhang, Keunbyoung YoonAbstract:Abstract A novel exfoliated-MoS2 (EMoS2)–MgCl bi-supported Ziegler-Natta Catalyst was synthesized by the reaction of Grignard reagent and EMoS2, followed by anchoring with TiCl4. The tendency of the individual EMoS2 layers to aggregate was prevented by covering them with solid-state Ziegler-Natta Catalyst. The resultant Catalyst was applied to ethylene polymerization, forming polyethylene (PE)/EMoS2 organic-inorganic hybrid nanocomposites. The resultant products had a flake-shape morphology, with EMoS2 well dispersed in the PE matrix. In addition, the thermal stability and mechanical properties of PE were significantly enhanced by the introduction of EMoS2.
