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Study of Silica‐Supported Chromocene Catalysts for Ethylene Polymerization
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2020-08-07 , DOI: 10.1002/macp.202000181 Kai Wang 1 , Yuli Gao 2 , Jianjun Yi 2 , Ning Zhao 1 , Yulong Jin 3 , Xuelian He 1 , Boping Liu 3
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2020-08-07 , DOI: 10.1002/macp.202000181 Kai Wang 1 , Yuli Gao 2 , Jianjun Yi 2 , Ning Zhao 1 , Yulong Jin 3 , Xuelian He 1 , Boping Liu 3
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Ultrahigh molecular weight polyethylene (UHMWPE) has drawn great interest from researchers because it possesses many excellent properties such as superb strength and impact resistance, which other polyolefin cannot achieve. A silica‐supported chromocene catalyst, for the production of UHMWPE, is successfully developed. The polyethylene (PE) produced by the chromocene catalyst can achieve a molecular weight (MW) of over 3 × 106 g mol−1 with narrow molecular weight distribution (MWD) a value of approximately three. The activity calculated by Cr per unit reaches the maximum when the loading of Cr is 1.7 wt%. With the increasing loading of chromocene, the MW shows a small increase and the MWD becomes narrower. The chromocene catalyst for ethylene polymerization also shows a significant hydrogen response. With 0.01 MPa hydrogen added into the ethylene polymerization, the MW of the PE decreases immensely to only 0.7 × 106 g mol−1 and the MWD is broadened from <3 to ≈12. If the amount of hydrogen increases, the MW continues to decrease and the MWD becomes wider. The MW of the PE produced by the chromocene catalyst can be regulated easily by adjusting the amount of hydrogen.
中文翻译：
二氧化硅负载的铬茂金属乙烯聚合催化剂的研究
超高分子量聚乙烯（UHMWPE）引起了研究人员的极大兴趣，因为它具有许多出色的性能，例如高强度和抗冲击性，而其他聚烯烃则无法实现。成功开发出了用于UHMWPE生产的二氧化硅负载的二茂铬催化剂。通过二茂铬催化剂生产的聚乙烯（PE）可以实现超过3×10 6 g mol -1的分子量（MW）窄分子量分布（MWD）的值约为3。当Cr的负载量为1.7重量％时，以Cr为单位计算的活性达到最大。随着二茂铬负载量的增加，MW显示出很小的增加，而MWD变得更窄。用于乙烯聚合的二茂铬催化剂也显示出显着的氢响应。在乙烯聚合反应中添加0.01 MPa的氢气后，PE的MW大大降低至0.7×10 6 g mol -1，MWD从<3扩大到≈12。如果氢含量增加，则MW继续降低，MWD变宽。可以通过调节氢的量容易地调节由二茂铬催化剂产生的PE的MW。
更新日期：2020-09-08
中文翻译：
二氧化硅负载的铬茂金属乙烯聚合催化剂的研究
超高分子量聚乙烯（UHMWPE）引起了研究人员的极大兴趣，因为它具有许多出色的性能，例如高强度和抗冲击性，而其他聚烯烃则无法实现。成功开发出了用于UHMWPE生产的二氧化硅负载的二茂铬催化剂。通过二茂铬催化剂生产的聚乙烯（PE）可以实现超过3×10 6 g mol -1的分子量（MW）窄分子量分布（MWD）的值约为3。当Cr的负载量为1.7重量％时，以Cr为单位计算的活性达到最大。随着二茂铬负载量的增加，MW显示出很小的增加，而MWD变得更窄。用于乙烯聚合的二茂铬催化剂也显示出显着的氢响应。在乙烯聚合反应中添加0.01 MPa的氢气后，PE的MW大大降低至0.7×10 6 g mol -1，MWD从<3扩大到≈12。如果氢含量增加，则MW继续降低，MWD变宽。可以通过调节氢的量容易地调节由二茂铬催化剂产生的PE的MW。
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