Citation: Hen-mei Ni, Hui Zhang, Guo-xia Chen, Jun-xiu Liu, Ya-dong Yang, Li-jun Zhang, Min Wu, Kan Zhan, Yu-lu Chen. Partition of Initiators in Quasi-static Precipitation Polymerization of AAm/MAc[J]. Chinese Journal of Polymer Science, ;2014, 32(10): 1400-1412. doi: 10.1007/s10118-014-1498-6 shu

Partition of Initiators in Quasi-static Precipitation Polymerization of AAm/MAc

Hen-mei Ni ^1,, ,
Hui Zhang ¹ ,
Guo-xia Chen ¹ ,
Jun-xiu Liu ¹ ,
Ya-dong Yang ¹ ,
Li-jun Zhang ¹ ,
Min Wu ¹ ,
Kan Zhan ¹ ,
Yu-lu Chen ¹

1.
School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China

Corresponding author: Hen-mei Ni,
Received Date: 20 December 2013
Revised Date: 19 March 2014

Fund Project: This work was financially supported by the National Natural Science Foundation of China (No. 51073035).

In order to investigate the partition of initiators for quasi-static precipitation polymerization of acrylamide (AAm) and methacrylic acid (MAc) in ethanol, azo-initiators were employed with various functional groups such as -COOCH3 (V-601, dimethyl 2,2-azobis(isobutyrate)), -CN (V-65, 2,2-Azobis(2,4-diemthylvaleronitrile)), -COOH (V-501, 4,4-azobis(4-cyanovaleric acid)) and -NH-(VA-061, 2,2-azobis[2-(2-imidazolin-2-yl)propane]), respectively. Particle size, induction time and kinetics of polymerization were investigated by the scanning electron microscopy (SEM) and gravimetry. It was observed that the polymerization parameters, such as the particle size, induction time and polymerization rate, were considerably affected by the functional groups of initiators. Besides, the monomer concentration also played important roles in the particle formation. By using V-601, the polymerization rate was strongly correlated with the total surface area of particles and the concentration of initiators. However, by using V-501, the polymerization rate was strongly related to W0Ci,0, where W0 is the initial concentration of monomers and Ci,0, the initial concentration of initiators. The results indicated that the different functional groups determined the different partition types of initiators between the minimonomer droplets and the continuous phase due to the molecular interactions of initiator and monomers. V-601 was all partitioned in the continuous phase, but a part of V-65 was partitioned in the minimonomer droplets. Besides the V-501 dissolved in the continuous phase, a part of V-501 was adsorbed on the surface of minimonomer droplets. VA-061 destroyed the stability of minimonomer droplets by the formation of zwitterions with MAA.
- Partition of initiator,
- Precipitation of polymerization,
- Quasi-static state,
- Methacrylic acid and acrylamide
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