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Modification of SMA Using Epoxypropyl Trimethyl Ammonium Chloride for Carbon Black Dispersing

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Poly (styrene-alt-maleic anhydride) (SMA) was modified with epoxypropyl trimethyl ammonium chloride (ETA) through interfacial reaction to prepare an amphoteric dispersant SMG for carbon black dispering. Fourier transforms infrared spectroscopy (FTIR) indicated that the epoxy groups had reacted with anhydride groups. 30.96% anhydride groups in SMA was taken part in the reaction when molar ratio of ETA and SMA was 1.3, mass ratio of p-toluene sulfonic acid and SMA was 14%, and the reaction temperature was 78°C for 6 h. SMG showed an excellent dispersing ability for carbon black when modification degree was higher than 14%, the mass ratio of SMG and carbon black was 7%, and pH value was 9. The change rate of particle size of was only about 3.6% when prepared carbon black dispersion was treated at 60°C for 24 h. The zeta potentials of carbon black dispersion showed amphoteric properties.
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Document Type: Research Article

Publication date: January 1, 2012

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