Reversible Chain Transfer Catalyzed Polymerization with Alkyl Iodides Generated from Alkyl Bromides by in Situ Halogen Exchange

2021 ◽  
Author(s):  
Dan-Ni Gao ◽  
Yu-Lai Zhao ◽  
Jing-Yu Cai ◽  
Lin-Xi Hou ◽  
Long-Qiang Xiao
Keyword(s):  
Chain Transfer ◽  
Alkyl Bromides ◽  
Halogen Exchange ◽  
Reversible Chain Transfer ◽  
Alkyl Iodides ◽  
Catalyzed Polymerization

Reversible Chain Transfer Catalyzed Polymerization of Methyl Methacrylate with In-Situ Formed Alkyl Iodide Initiator

2009 ◽  
Vol 62 (11) ◽  
pp. 1492 ◽  
Author(s):  
Atsushi Goto ◽  
Koji Nagasawa ◽  
Ayaka Shinjo ◽  
Yoshinobu Tsujii ◽  
Takeshi Fukuda
Keyword(s):  
Methyl Methacrylate ◽  
Chain Transfer ◽  
Alkyl Iodide ◽  
Nitrogen And Phosphorus ◽  
Molecular Weights ◽  
Living Radical Polymerizations ◽  
Low Mass ◽  
Reversible Chain Transfer ◽  
Catalyzed Polymerization

A method utilizing generation of an alkyl iodide (low-mass dormant species) in situ formed in polymerization was adopted to reversible chain transfer catalyzed polymerizations (RTCP) (living radical polymerizations) with several nitrogen and phosphorus catalysts. The polymerization of methyl methacrylate afforded low-polydispersity polymers (Mw/Mn ~1.2–1.4), with Mn values predicted to high conversions; where Mn and Mw are the number- and weight-average molecular weights respectively. This method is robust and would enhance the utility of RTCP.

scholarly journals Organocatalyzed Living Radical Polymerization via in Situ Halogen Exchange of Alkyl Bromides to Alkyl Iodides

2017 ◽  
Vol 50 (5) ◽  
pp. 1882-1891 ◽  
Author(s):  
Longqiang Xiao ◽  
Keita Sakakibara ◽  
Yoshinobu Tsujii ◽  
Atsushi Goto
Keyword(s):  
Radical Polymerization ◽  
Living Radical Polymerization ◽  
Alkyl Bromides ◽  
Halogen Exchange ◽  
Alkyl Iodides

Dialkoxy-Substituted, C1-Symmetric Metallocenes: Synthesis and Catalytic Behavior in the Propylene Polymerization Reaction

2004 ◽  
Vol 59 (2) ◽  
pp. 233-240 ◽  
Author(s):  
Martin Schlögl ◽  
Bernhard Rieger
Keyword(s):  
Chain Transfer ◽  
Active Catalyst ◽  
Propylene Polymerization ◽  
Polymerization Reaction ◽  
Catalytic Behavior ◽  
Molecular Weights ◽  
Hydrocarbon Solvents ◽  
In Situ Activation ◽  
Reversible Chain Transfer

The synthesis of a series of C1-symmetric metallocene complexes rac-[1-(5,6-dialkoxy-2-methyl- 1-η5-indenyl)-2-(9-η5-fluorenyl)ethane]zirconium dichlorides (alkyl: n-butyl, n-hexyl, n-octyl, n-decyl) is described. These complexes are versatile catalysts in the polymerization of propylene after in situ activation with triisobutylaluminum (TIBA) and Ph3C[B(C6F5)4] in toluene and heptane solution. All catalysts show higher solubility and improved polymerization properties in industrially used hydrocarbon solvents (e.g. heptane). However, the molecular weights and isotacticity values of the resulting polypropylene materials are decreased compared to the ethoxy-bridged analogue rac- [1-(5,6-ethylenedioxy-2-methyl-η5-indenyl)-2-(9-η5-fluorenyl)ethane]zirconium dichloride. A possible explanation is based on enhanced interaction of the active catalyst centers with Al(III) scavenger molecules even at low Al : Zr ratios, leading to reversible chain transfer.

Triphenylphosphine as phosphorus catalyst for reversible chain-transfer catalyzed polymerization (RTCP)

2013 ◽  
Vol 4 (10) ◽  
pp. 3069 ◽  
Author(s):  
Liangjiu Bai ◽  
Lifen Zhang ◽  
Yuan Liu ◽  
Xiangqiang Pan ◽  
Zhenping Cheng ◽  
...  
Keyword(s):  
Chain Transfer ◽  
Reversible Chain Transfer ◽  
Catalyzed Polymerization
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