Chain Transfer to Polymer in Free-Radical Solution Polymerization ofn-Butyl Acrylate Studied by NMR Spectroscopy

1998 ◽  
Vol 31 (9) ◽  
pp. 2822-2827 ◽  
Author(s):  
Nasir M. Ahmad ◽  
Frank Heatley ◽  
Peter A. Lovell
Keyword(s):  
Free Radical ◽  
Nmr Spectroscopy ◽  
Butyl Acrylate ◽  
Chain Transfer ◽  
Solution Polymerization ◽  
Radical Solution

scholarly journals Optimization of a 3D-printed tubular reactor for free radical polymerization by CFD

2021 ◽  
Author(s):  
Sören Hapke ◽  
Gerrit Albert Luinstra ◽  
Kristina Maria Zentel
Keyword(s):  
Free Radical ◽  
Butyl Acrylate ◽  
Flow Reactor ◽  
Flow Behavior ◽  
Tubular Reactor ◽  
Reaction Network ◽  
Time Behavior ◽  
Solution Polymerization ◽  
3D Printed ◽  
Radical Solution

AbstractA flow reactor for the complex reaction network of the free radical solution polymerization of n-butyl acrylate was optimized by a combination of kinetic modeling, computational fluid dynamics (CFD) and additive manufacturing. CFD was used to model a flow reactor with SMX mixing elements. An optimized geometry was 3D-printed from polypropylene. The modeled residence time behavior was compared to relevant experiments, giving a validation for the flow behavior of the reactor. A kinetic model for the free radical solution polymerization of n-butyl acrylate (BA) was in addition implemented into the CFD model. It was used to predict the polymerization behavior in the flow reactor and the resulting product properties. The experimental and computational results were in acceptable agreement. Graphical abstract

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.

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