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

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.

2011 ◽  
Vol 396-398 ◽  
pp. 1667-1671 ◽  
Author(s):  
Yan Lin Sun ◽  
Hui Xiang Du ◽  
Hong Wang ◽  
Yun Hua Huang

The super-high molecular weight polyacrylamide flocculants were synthesized using potassium persulfate/sodium hydrogen sulfite as initiators via free radical solution polymerization. The effects of monomer concentration and initiator dosage on the molecular weight, insoluble fraction and dissolution rate of PAM were investigated. The flocculation properties of PAMs prepared was examined by flocculating kaolin suspensions. The results show that the PAM products synthesized at the monomer concentration 30% and the initiator dosage 0.5‰ can meet the requirements. The molecular weight of this kind of PAM can reach 5.84×106, insoluble fraction can decrease to 0, and the dissolution can be completed in 10 minutes. Using this kind of PAM as flocculants (1.45mg PAM/100g kaolin suspension), the clear water transmittance can be up to 99% at pH 3.5~4.0.


1986 ◽  
Vol 34 (2) ◽  
pp. 209-214 ◽  
Author(s):  
J U Alles ◽  
K Bosslet

A new monoclonal antibody (moab BW 200) of IgG3 kappa-isotype was generated which recognizes an epitope located on an antigen molecule restricted to human neoplastic and non-neoplastic endothelial cells. The molecular weight of the antigen was determined using immunoprecipitation analysis followed by SDS-PAGE. Despite its similar molecular weight to FVIII-RAG, the antigen detected by moab BW 200 was shown to be different from FVIII-RAG.


2000 ◽  
Vol 33 (18) ◽  
pp. 6738-6745 ◽  
Author(s):  
François Ganachaud ◽  
Michael J. Monteiro ◽  
Robert G. Gilbert ◽  
Marie-Anne Dourges ◽  
San H. Thang ◽  
...  

RSC Advances ◽  
2014 ◽  
Vol 4 (63) ◽  
pp. 33269-33278 ◽  
Author(s):  
Lili Xu ◽  
Lixia Che ◽  
Jing Zheng ◽  
Guangsu Huang ◽  
Xiaorong Wu ◽  
...  

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


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