Characterization of Heterocoagulation Process with Oppositely Charged Polymer Colloid Particles Through Light Transmittance
Heterocoagulation of colloid particles with opposite surface charge has been used for preparation of composite microspheres with specifically designed suprastructure, such as those with raspberry-like surface morphology1 and core-shell microspheres2,3, which are difficult to achieve through other techniques.Here we report our investigation on the heterocoagulation of cationic polystyrene (PSt)particles (denoted as SC particles hereafter)4 with anionic poly(methyl methacrylate) (PMMA)particles(denoted as LA particles hereafter) by on-line follow-up of the light transmittance evolution in the process.This on-line follow-up imposes practically no disturbance to the dispersion and no any post-treatment for the samples.Different heterocoagulation was conducted with SC and LA latexes with different latex mixing regime and of different particle size for both latexes.It was seen that the dispersion of the binary latex mixture was destabilized immediately with addition of SC latex into LA latex of PMMA;whereas the system remained quite stable for a long while when the process was conducted by addition of LA latex into SC latex of PSt.The mechanism of the heterocoagulation process was proposed as displayed in Fig.1.In addition, when the heterocoagulation process was carried out with cationic latexes of different particle size, the larger was the cationic particle size, the earlier the system was flocculated;while the smaller was the anionic particle size, the earlier was the system flocculated when the process was carried out with anionic latexes of different particle size.
Hongyan Cao Libin Zhang Xiang Zheng Kong
College of chemistry and chemical engineering, University of Jinan, 250022, China
国际会议
9th International Symposium on High-Tech Polymer Materials(第9届国际高技术高分子材料学术会议)(HTPM-9)
郑州
英文
66-66
2016-07-11（万方平台首次上网日期，不代表论文的发表时间）