Preparation Of Poly (Acrylonitrile-Butadiene) Nanophase Letax By Ultrasonic

The copolymerization of acrylonitrile-butadiene latex system was studied by ultrasonic emulsification. The effect of polymerization factors including the ultrasonic time, polymerization temperature, polymerization time, the dosage of RSH, the dosages and adding wises of emulsifiers and initiators on the molecular weight, conversion, the contents of solid and gel, copolymer microstructure, the emulsion particles size, particles distribution and particles configuration were studied primarily. Compared to the traditional butadiene-acrylonitrile emulsion polymerization, the conversion of copolymer was increased enormously and arrived at 70% in this system which polymerization temperature is 30℃, polymerization time is 4 hours, the ultrasonic time is 90 minutes, and with 3.5 shares emulsifier. At the same time, the best times of the ultrasonic emulsification were ascertained of different polymerization temperatures, Which are 90 minutes at 30℃, 150 minutes at 0℃, and 30minutes at 50℃. The emulsion particles size was changed greatly with the ultrasonic time increasing. The emulsion particles size with no ultrasonic was between 100nm and 500nm. With the ultrasonic time increasing, the emulsion particles were becoming smaller and smaller. For example, the emulsion particles diameter with 45 minutes ultrasonic was about 75nm and accordingly with 90 minutes ultrasonic was under 50nm. On the other hand, with the ultrasonic time increasing, the distribution of particles size was becoming narrower and narrower. In the same way, the dosages of the emulsifier and initiator greatly also influenced the emulsion particles size and their distribution. With the dosage increasing, their emulsion particles were becoming...