The theoretical study on anionic polymerization mechanism of maleimide: Chain propagation by p-π conjugation process

2008 ◽  
Vol 108 (7) ◽  
pp. 1257-1265 ◽  
Author(s):  
Xiao Hua ◽  
Feng-Li Bei ◽  
Xin Wang ◽  
Xu-Jie Yang ◽  
Lu-De Lu
Keyword(s):  
Anionic Polymerization ◽  
Theoretical Study ◽  
Chain Propagation ◽  
Polymerization Mechanism ◽  
Conjugation Process

Theoretical Study of Polymerization Mechanism ofp-Xylylene Based Polymers

2010 ◽  
Vol 114 (12) ◽  
pp. 4296-4303 ◽  
Author(s):  
Krzysztof Smalara ◽  
Artur Giełdoń ◽  
Maciej Bobrowski ◽  
Jarosław Rybicki ◽  
Cezary Czaplewski
Keyword(s):  
Theoretical Study ◽  
Polymerization Mechanism

Study the Influences of ZnEt2 on Ethylene Chain Transfer Polymerization

2012 ◽  
Vol 602-604 ◽  
pp. 672-675
Author(s):  
An Guo Xiao ◽  
Shi Biao Zhou ◽  
Qing Yun Zheng ◽  
You Ming Shen ◽  
Yong Bin Zhuan
Keyword(s):  
Ethylene Polymerization ◽  
Nickel Complex ◽  
Chain Transfer ◽  
Ion Pairs ◽  
Catalyst System ◽  
Chain Propagation ◽  
Polymerization Mechanism ◽  
System 1 ◽  
Chain Transfer Polymerization

The influences of ZnEt2 on ethylene chain transfer polymerization were investigated in detail and the polymerization mechanism was thoroughly analyzed. The results indicated that ZnEt2 contributed greatly to increase the activity of α-diimine nickel complex/ZnEt2/MAO(MAO: methylaluminoxane). It was striking that α-diimine nickel complex/ZnEt2 catalyst system (1/100 mol/mol) exhibited 8.0 ×104g/mol∙h activity, it was possible the formation of the ion pairs of Nickel and Zinc was convenient for ethylene chain propagation, however, the ion pairs were unstable in ethylene polymerization.

A New Living Emulsion Polymerization Mechanism:  Episulfide Anionic Polymerization

2002 ◽  
Vol 35 (23) ◽  
pp. 8688-8693 ◽  
Author(s):  
A. Rehor ◽  
N. Tirelli ◽  
J. A. Hubbell
Keyword(s):  
Emulsion Polymerization ◽  
Anionic Polymerization ◽  
Polymerization Mechanism

A Theoretical Study of Silanol Polymerization

1986 ◽  
Vol 73 ◽  
Author(s):  
Larry W. Burggraf ◽  
Larry P. Davis
Keyword(s):  
Complex Systems ◽  
Molecular Orbital ◽  
Anionic Polymerization ◽  
Theoretical Study ◽  
State Of The Art ◽  
Activation Barrier ◽  
Polymerization Process ◽  
Nucleophilic Attack ◽  
Semi Empirical ◽  
Coordinate Structures

ABSTRACTWe have applied state-of-the-art semi-empirical molecular orbital methods to a study of the anionic polymerization of silanols to form silica. In particular, we have considered nucleophilic attack on silanols and subsequent reactions of the products. Hydroxide addition proceeds without activation to form five-coordinate silicate anions. Five-coordinate structures can also be formed by oligomerization following the attack of hydroxide on neutral silanols to abstract a proton. These five-coordinate structures are predicted to play a key role as intermediates in the polymerization process. Water can be eliminated from these anions, but with a substantial activation barrier. The activation barrier appears to be lower for the larger, more complex systems. These predictions are consistent with a rapid pre-equilibrium to form dimer anions followed by the slower reaction to form higher oligomers.

Anionic polymerization of .beta.-lactones initiated with alkali-metal alkoxides: reinvestigation of the polymerization mechanism

1992 ◽  
Vol 25 (7) ◽  
pp. 2017-2020 ◽  
Author(s):  
Piotr Kurcok ◽  
Marek Kowalczuk ◽  
Krystian Hennek ◽  
Zbigniew Jedlinski
Keyword(s):  
Alkali Metal ◽  
Anionic Polymerization ◽  
Metal Alkoxides ◽  
Polymerization Mechanism
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