Citation: SITU Yue, ZHOU Li-Zhuang, LAN Ren-Hua, XIA Zheng-Bin, CHEN Huan-Qin. Influencing Mechanism of Methacrylic Acid on the Redispersion Properties of Redispersible Polymer Powders[J]. Acta Physico-Chimica Sinica, ;2010, 26(12): 3237-3242. doi: 10.3866/PKU.WHXB20101209 shu

Influencing Mechanism of Methacrylic Acid on the Redispersion Properties of Redispersible Polymer Powders

1.
School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China

Received Date: 31 July 2010
Available Online: 29 October 2010
Fund Project: 国家中小型企业技术创新基金(08C26214402212) (08C26214402212)广州市中小企业技术创新基金(2008V41 C0021)资助 (2008V41 C0021)

Acrylic polymer emulsions were synthesized by semi-continuous seeded emulsion polymerization and the corresponding redispersible polymer powders were prepared by spray drying. Methacrylic acid (MAA) was used as the hydrophilic shell monomer. The influences of the amount of MAA on the average particle size of the original emulsion, the dispersion stability, zeta potential, and size distribution of the redispersion emulsion were investigated. The results show that with an increase in the amount of MAA, the particle size of original emulsion, the dispersion stability, and the zeta potential of the redispersion emulsion increased significantly. The size distribution of the redispersion emulsion with a high amount of MAA was unimodal and similar to the original emulsion indicating excellent water-redispersibility. Transmission electron microscopy (TEM) was used to characterize the internal microtopography of the redispersible polymer powder, and results showed that with a higher amount of MAA, millipores with larger pore sizes were present in the transection of the redispersible polymer powder. When polymer powders are redispersed in an aqueous phase, large micropores provide a more convenient channel for water permeation, which optimizes the redispersibility. The hairy structure and higher zeta potential endow the redispersion emulsion with excellent redispersion stability.
- Methacrylic acid,
- Redispersible polymer powder,
- Stability,
- Hollow polymer powder
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