Reduction of Chain Entanglement of Ethylene Polymerization Endowed by the Dormancy Effect of Fluorosilicone Microdroplets,Industrial & Engineering Chemistry Research

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Reduction of Chain Entanglement of Ethylene Polymerization Endowed by the Dormancy Effect of Fluorosilicone Microdroplets
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2023-04-03 , DOI: 10.1021/acs.iecr.2c04514
Quanwei Peng _{1,

2} , Yun Shuai _{1,

2} , Qi Zhou ₃ , Yuming Chen _{1,

2} , Jincheng Dai ₂ , Congjing Ren _{1,

2} , Zhengliang Huang ₂ , Wei Li _{1,

2,

4} , Jingdai Wang _{1,

2,

4} , Yongrong Yang _{1,

2,

4}

Affiliation

The refined fluorosilicone microdroplets were introduced during the ethylene slurry polymerization to reduce the chain entanglement of ultra-high-molecular-weight polyethylene (UHMWPE) through the intermittent dormancy of living polymer chains. The dormancy effect is endowed by the highly frequent collisions between microdroplets and growing PE particles to block the transfer channel of reactants on the particle surface. The dwell time of microdroplets on the particle surface is an order of magnitude higher than that of the microbubbles, and the increase rate of the chain entanglement degree with the polymerization activity controlled by microdroplets is 2 orders of magnitude smaller than that of the microbubbles, indicating that fluorosilicone microdroplets have a better effect on the reduction of the chain entanglement. Compared with commercial products, the UHMWPE prepared in this work shows a lower chain entanglement degree and better mechanical properties, indicating that reducing the entanglement degree is one of the important means to improve the mechanical properties of UHMWPE.

中文翻译：

氟硅微滴休眠效应降低乙烯聚合链缠结

在乙烯淤浆聚合过程中引入精制的氟硅微滴，通过活性聚合物链的间歇休眠减少超高分子量聚乙烯 (UHMWPE) 的链缠结。休眠效应是由于微液滴与生长中的 PE 颗粒之间的频繁碰撞而阻塞了反应物在颗粒表面的传递通道。微滴在颗粒表面的停留时间比微泡高一个数量级，微滴控制的链缠结度随聚合活性的增加速率比微泡小2个数量级，表明氟硅微滴对减少链缠结有更好的效果。

更新日期：2023-04-03

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