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CrV Bimetallic Phillips Catalyst Prepared by Citric Acid‐Assisted Impregnation on Ethylene Polymerization
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2020-04-22 , DOI: 10.1002/macp.202000010 Ying Liu 1 , Rui Zhang 2 , He Ren 2 , Yue Liu 1 , Shijia Ling 1 , Hongwei Zhang 1 , Boping Liu 3 , Ruihua Cheng 1
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2020-04-22 , DOI: 10.1002/macp.202000010 Ying Liu 1 , Rui Zhang 2 , He Ren 2 , Yue Liu 1 , Shijia Ling 1 , Hongwei Zhang 1 , Boping Liu 3 , Ruihua Cheng 1
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Three CrV bimetallic Phillips catalysts are developed by a citric acid‐assisted impregnation method and studied in ethylene homopolymerization and ethylene/1‐hexene copolymerization. The method benefits to the dispersion of bimetallic active sites, especially for the V ones. The electron binding energy shift of V 2p3/2 in CrV‐1/2‐CA suggests the increased electron deficiency of V active center. The CrV‐1/2‐CA, CrV‐1/3‐CA catalysts present higher activity, broader molecular weight distribution, than the counterparts without CA‐assisted impregnation, suggesting more active sites involved in the reaction. The 1‐hexene is higher inserted in the polyethylene by CrV‐1/2 than the CrV‐1/2‐CA. But the results of temperature rising elution fractionation‐successive self‐nucleation and annealing (TREF‐SSA) show the thinner platelet thickness at the high molecular weight parts of high‐density polyethylene by CrV‐1/2‐CA, suggesting the higher insertion of 1‐hexene and higher tensile properties. The CrV‐1/2‐CA also shows the more hydrogen‐regulated response in the polymerization. The deconvolution of the gel permeation chromatography curves presents the higher fractions of high molecular weight polymer component.
中文翻译：
柠檬酸辅助乙烯聚合浸渍制备的CrV双金属菲利普斯催化剂
通过柠檬酸辅助浸渍法开发了三种CrV双金属Phillips催化剂，并进行了乙烯均聚和乙烯/ 1-己烯共聚的研究。该方法有利于双金属活性位点的分散，尤其是对于V型活性位。V 2p 3/2的电子结合能移动在CrV-1 / 2-CA中，表明V活性中心的电子缺乏增加。CrV-1 / 2-CA，CrV-1 / 3-CA催化剂比没有CA辅助浸渍的同类催化剂具有更高的活性和更宽的分子量分布，表明该反应涉及更多的活性位点。1-己烯在聚乙烯中的插入量比CrV-1 / 2-CA高CrV-1 / 2。但是温升洗脱分馏-成功的自成核和退火（TREF-SSA）结果表明，CrV-1 / 2-CA使高密度聚乙烯的高分子量部分的血小板厚度变薄，这表明1-己烯和更高的拉伸性能。CrV1 / 2-CA在聚合反应中也显示出更多的氢调节反应。
更新日期：2020-04-22
中文翻译：
柠檬酸辅助乙烯聚合浸渍制备的CrV双金属菲利普斯催化剂
通过柠檬酸辅助浸渍法开发了三种CrV双金属Phillips催化剂，并进行了乙烯均聚和乙烯/ 1-己烯共聚的研究。该方法有利于双金属活性位点的分散，尤其是对于V型活性位。V 2p 3/2的电子结合能移动在CrV-1 / 2-CA中，表明V活性中心的电子缺乏增加。CrV-1 / 2-CA，CrV-1 / 3-CA催化剂比没有CA辅助浸渍的同类催化剂具有更高的活性和更宽的分子量分布，表明该反应涉及更多的活性位点。1-己烯在聚乙烯中的插入量比CrV-1 / 2-CA高CrV-1 / 2。但是温升洗脱分馏-成功的自成核和退火（TREF-SSA）结果表明，CrV-1 / 2-CA使高密度聚乙烯的高分子量部分的血小板厚度变薄，这表明1-己烯和更高的拉伸性能。CrV1 / 2-CA在聚合反应中也显示出更多的氢调节反应。
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