Chain Transfer to Polymer in Free-Radical Solution Polymerization of 2-Ethylhexyl Acrylate Studied by NMR Spectroscopy

2001 ◽  
Vol 34 (22) ◽  
pp. 7636-7641 ◽  
Author(s):  
Frank Heatley ◽  
Peter A. Lovell ◽  
Tsuyoshi Yamashita
Keyword(s):  
Free Radical ◽  
Nmr Spectroscopy ◽  
Chain Transfer ◽  
Solution Polymerization ◽  
Radical Solution

Synthesis and thermal degradation property study of N-vinylpyrrolidone and acrylamide copolymer

RSC Advances ◽  
2014 ◽  
Vol 4 (63) ◽  
pp. 33269-33278 ◽  
Author(s):  
Lili Xu ◽  
Lixia Che ◽  
Jing Zheng ◽  
Guangsu Huang ◽  
Xiaorong Wu ◽  
...  
Keyword(s):  
Free Radical ◽  
Thermal Degradation ◽  
Solution Polymerization ◽  
Radical Solution

A series of acrylamide (AM) and N-vinylpyrrolidone (NVP) copolymer with various NVP content were synthesised by free radical solution polymerization.

scholarly journals Using free radical polymerization and Mannich reaction, synthesis and characterization of cationic polyacrylamides having similar molecular weight but different charge densities

2018 ◽  
Vol 9 (2) ◽  
pp. 79-83 ◽  
Author(s):  
Raid Saleh Shatat ◽  
Shaik Kalimulla Niazi
Keyword(s):  
Molecular Weight ◽  
Free Radical ◽  
Mannich Reaction ◽  
Solution Polymerization ◽  
Similar Molecular Weight ◽  
Charge Densities ◽  
Polyacrylamide Solution ◽  
Acrylamide Monomer ◽  
Radical Solution

Using free radical solution polymerization technique and Mannich reaction, five different polyacrylamides with similar molecular weight but variable charge densities were synthesized. High molecular weight polyacrylamides were synthesized using potassium persulfate and N,N,N',N'-tetramethylethylenediamine system as initiators. This was achieved by increasing the concentration of acrylamide monomer. They were then characterized by infrared spectroscopy, viscosity measurements and glass transition temperature measurement. These compounds with various cationic charge densities from 48.2, 161.7, 355, 425 and 485 C/g were prepared through Mannich reaction. The results indicate, by increasing the acidity of the polyacrylamide solution using sulfuric acid, the pH of the polyacrylamide solution decreases correspondingly. As a result, the positive charges increased resulting in the enrichment of charge densities.

New Approach to Fabricate Microcapsules with Comb-Like Copolymer Shell by Phase Separation Method

2013 ◽  
Vol 860-863 ◽  
pp. 577-581
Author(s):  
Xiao Fen Tang ◽  
Wei Li ◽  
Xing Xiang Zhang
Keyword(s):  
Phase Separation ◽  
Free Radical ◽  
Ph Value ◽  
Separation Method ◽  
Molar Ratio ◽  
Solution Polymerization ◽  
Crystallinity Degree ◽  
New Approach ◽  
Shell Forming ◽  
Radical Solution

Microcapsules containingn-octadecane (MicroC18) withn-octadecyl methacrylate (ODMA)-methacrylic acid (MAA) copolymer shell were fabricated through phase separation method, in which the shell-forming copolymers synthesized by free-radical solution polymerization. Meanwhile, theses copolymers were employed as the surfactant during microencapsulation. The crystallization temperature and crystallinity degree of comb-like copolymer display a gradual decrease with an increase the molar ratio of MAA. MicroC18 with spherical profiles and the diameter ranging from 3 to 20 μm were fabricated. In addition, the system pH value plays an important role in the formation process of microcapsules and the optimum value of pH in the range of 8.5-10.5.

A zwitterionic polymer containing a hydrophobic group: enhanced rheological properties

2020 ◽  
Vol 44 (23) ◽  
pp. 9703-9711
Author(s):  
Ling Liu ◽  
Shaohua Gou ◽  
Huichao Zhang ◽  
Lihua Zhou ◽  
Lan Tang ◽  
...  
Keyword(s):  
Free Radical ◽  
Rheological Properties ◽  
Solution Polymerization ◽  
Hydrophobic Group ◽  
Zwitterionic Polymer ◽  
Radical Solution ◽  
Long Chain

A zwitterionic polymer containing a hydrophobic long chain, named MANPS, was independently developed by free radical solution polymerization.

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