Highly trans-1,4-stereoselective coordination chain transfer polymerization of 1,3-butadiene and copolymerization with cyclic esters by a neodymium-based catalyst system

2015 ◽  
Vol 6 (33) ◽  
pp. 6088-6095 ◽  
Author(s):  
Wenjie Zheng ◽  
Nan Yan ◽  
Yutian Zhu ◽  
Wenpeng Zhao ◽  
Chunyu Zhang ◽  
...  
Keyword(s):  
Chain Transfer ◽  
Catalyst System ◽  
Amphiphilic Copolymers ◽  
Cyclic Esters ◽  
System P ◽  
Chain Transfer Polymerization

Highly trans-1,4-stereoregular polybutadiene (TPB) was obtained by CCTP and novel amphiphilic copolymers (TPB-b-PCL/PLA) were successfully synthesized.

Preparation of core–shell attapulgite particles by redox-initiated surface reversible addition–fragmentation chain transfer polymerization via a “graft from” approach

RSC Advances ◽  
2016 ◽  
Vol 6 (17) ◽  
pp. 14120-14127 ◽  
Author(s):  
Haicun Yang ◽  
Sheng Xue ◽  
Ji Pan ◽  
Fanghong Gong ◽  
Hongting Pu
Keyword(s):  
Polymethyl Methacrylate ◽  
Chain Transfer ◽  
Core Shell ◽  
Redox Initiation ◽  
Initiation System ◽  
System P ◽  
Reversible Addition ◽  
Chain Transfer Polymerization

Polymethyl methacrylate layer was grown uniformly from attapulgite by using surface-initiated reversible addition–fragmentation chain transfer polymerization via redox initiation system.

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.

One-pot copolymerization of epoxides/carbon dioxide and lactide using a ternary catalyst system

2018 ◽  
Vol 8 (24) ◽  
pp. 6452-6457 ◽  
Author(s):  
Xiang Li ◽  
Chenyang Hu ◽  
Xuan Pang ◽  
Ranlong Duan ◽  
Xuesi Chen
Keyword(s):  
Carbon Dioxide ◽  
Catalytic System ◽  
Chain Transfer ◽  
Catalyst System ◽  
Transfer Mechanism ◽  
One Pot ◽  
Multiblock Copolymer ◽  
System P ◽  
Ternary Catalyst

A PLA/PPC multiblock copolymer was prepared using a novel ternary catalytic system that proceeds via an intermolecular chain transfer mechanism.

scholarly journals Synthesis of aminated polystyrene and its self-assembly with nanoparticles at oil/water interface

e-Polymers ◽  
2020 ◽  
Vol 20 (1) ◽  
pp. 317-327
Author(s):  
Chenliang Shi ◽  
Ling Lin ◽  
Yukun Yang ◽  
Wenjia Luo ◽  
Maoqing Deng ◽  
...  
Keyword(s):  
Interfacial Tension ◽  
Self Assembly ◽  
Carbon Dots ◽  
Chain Transfer ◽  
Functionalized Polymers ◽  
Amino Groups ◽  
One Dimensional ◽  
Reversible Addition ◽  
Oil Water ◽  
Chain Transfer Polymerization

AbstractThe influence of density of amino groups, nanoparticles dimension and pH on the interaction between end-functionalized polymers and nanoparticles was extensively investigated in this study. PS–NH2 and H2N–PS–NH2 were prepared using reversible addition–fragmentation chain transfer polymerization and atom transfer radical polymerization. Zero-dimensional carbon dots with sulfonate groups, one-dimensional cellulose nanocrystals with sulfate groups and two-dimensional graphene with sulfonate groups in the aqueous phase were added into the toluene phase containing the aminated PS. The results indicate that aminated PS exhibited the strongest interfacial activity after compounding with sulfonated nanoparticles at a pH of 3. PS ended with two amino groups performed better in reducing the water/toluene interfacial tension than PS ended with only one amino group. The dimension of sulfonated nanoparticles also contributed significantly to the reduction in the water/toluene interfacial tension. The minimal interfacial tension was 4.49 mN/m after compounding PS–NH2 with sulfonated zero-dimensional carbon dots.

Effect of pressure on synthetic diamond crystals at high temperatures and pressures in Fe/Ni catalyst system

CrystEngComm ◽  
2021 ◽  
Author(s):  
Shuai Fang ◽  
Yongkui Wang ◽  
Liangchao Chen ◽  
Zhiyun Lu ◽  
Zhenghao Cai ◽  
...  
Keyword(s):  
Nitrogen Content ◽  
Growth Mechanism ◽  
Synthetic Diamond ◽  
Natural Diamond ◽  
Catalyst System ◽  
Necessary Condition ◽  
Ni Catalyst ◽  
Effect Of Pressure ◽  
Diamond Crystals ◽  
System P

Pressure is a necessary condition for the growth of natural diamond. Studying the effect of pressure on the nitrogen content of diamond is important for exploring the growth mechanism of...

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