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Random Copolymer as Polymeric Surfactant in Seed Emulsion Polymerization

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Published/Copyright: July 9, 2015
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Abstract

An amphiphilic random copolymer was synthesized and applied as a surfactant in seed emulsion polymerization. The composition and structure of the copolymer were confirmed by Fourier transforms infrared spectroscopy (FTIR), 1H nuclear magnetic resonance spectroscopy (1H NMR), gel permeation chromatography (GPC) and differential scanning calorimetry (DSC). The effect of the copolymer content on the properties of latexes and their sizing properties was discussed. The average size, size distribution and stability of latexes were measured by quasi-elastic light scattering. The results suggest that the copolymer was a random copolymer, and displayed surface-active properties in water. The copolymer content affected strongly the properties of latex and its sizing performance. Monodisperse and nano-sized latex particles were obtained in the presence of 10.5 % copolymer. The thermal characteristics of latex films could be regulated by controlling the content of the copolymer. Adding an appropriate amount of the copolymer could reduce the surface tension of the latexes and promote their adsorption on the paper surface. Latex-treated paper showed a better water resistance and higher surface strength.

Kurzfassung

Es wurde ein amphiphiles statistisches Copolymer synthetisiert und als Tensid in der Keimemulsionspolymerisation verwendet. Die Zusammensetzung und Struktur des Copolymers wurden mittels Fourier-Transformations-Infrarot-Spektroskopie (FTIR), 1H-Kernresonanzspektroskopie (1H-NMR), Gelpermeationschromatographie (GPC) und dynamischer Differenzkalorimetrie (DSC) bestätigt. Der Einfluss des Polymergehalts auf die Eigenschaften der Latizes und ihre Schlichte-Eigenschaften wurde diskutiert. Die durchschnittliche Größe, die Größenverteilung und die Stabilität der Latizes wurden mittels der quasi-elastischen Lichtstreuung gemessen. Die Ergebnisse zeigen, dass das Copolymer ein statistisches Copolymer ist und in Wasser oberflächenaktive Eigenschaften besitzt. Monodisperse und nanogroße Latexpartikel wurden in Anwesenheit von 10,5 % Copolymer erhalten. Die thermischen Eigenschaften der Latexfilme konnten durch eine Kontrolle des Copolymergehaltes eingestellt werden. Durch Zugabe einer geeigneten Copolymermenge konnte die Oberflächenspannung der Latizes reduziert und ihre Adsorption an der Papieroberfläche begünstigt werden. Das mit Latex behandelte Papier zeigte eine bessere Wasserbeständigkeit und eine höhere Oberflächenfestigkeit.


*Correspondence address, Mrs. Dr. Xiuhua Yan, School of Chemical and Biological Engineering, Yancheng Institute of Technology, 211 Jianjun R. D, Yancheng 224051, PR China, Tel.: +8 65 15 88 29 86 15, Fax: +8 65 15 88 29 86 15, E-Mail:
1

These authors contribute equally to this work.

Dr. Xiuhua Yan is an instructor of Chemistry and Biology, Yancheng Institute of Technology, Yancheng. She conducts basic and applied research in colloidal chemistry, surfactant chemistry. She is presently leading a small group studying synthesis and applications of surfactant.

Dr. Wei Xu is an associate professor of School of Marine and Biological Engineering, Yancheng Institute of Technology. She obtained Ph.D. in biochemical engineering (Nanjing University of Technology, China, 2007). She conducts basic and applied research in synthetic chemistry and enzyme engineering. She is the author of 20 publications related to her research in these fields.

Dr. Rong Shao is an professor of School of Chemistry and Chemical Engineering, Yancheng Institute of Technology. He conducts basic and applied research in chemical engineering.

Dr. Lanqing Tang is an associate professor of School of Chemistry and Chemical Engineering, Yancheng Institute of Technology. She conducts basic and applied research in chemical engineering.

Dr. Wenyan Shi is an associate professor of School of Chemistry and Chemical Engineering, Yancheng Institute of Technology. She conducts basic and applied research in synthetic chemistry.


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Received: 2014-11-02
Accepted: 2015-01-16
Published Online: 2015-07-09
Published in Print: 2015-07-15

© 2015, Carl Hanser Publisher, Munich

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