Abstract:This review is focused on the features, preparation and applications of uniform cationic polymer latex particles, as well as on the formation mechanism of uniform latex particles. Substantial progress in the size and shape control of polymer latex particles has been made using several methods such as dispersion polymerization, conventional emulsion polymerization, surfactant‐free emulsion polymerization and seeded emulsion polymerization. Uniform cationic polymer latex particles have wide applications such as … Show more
“…[10] Cationic latex soap-free emulsion polymerization in the presence of cationic initiator. [11][12][13] It is very difficult to control the particle size distribution of the final latex, even though these researches provide a substantial foundation for controlling particle size distribution and particle morphology.…”
A novel approach to synthesize narrow particle size distribution cationic latex particles based on styrene and butyl acrylate was proposed. The effect of monomer/water ratios, surfactant (cetyltrimethylammonium chloride) concentrations and monomer compositions on the evolution of particle size, distribution, number and morphology as a function of monomer conversion were concerned in order to confirm the optimum polymerization condition. As expected, the particle size of the ultima latex increased with monomer/water ratios and styrene contents decreased with increasing surfactant concentrations. Continue nucleation phenomena occurred when monomer/water ratio was lesser than 30/70, resulting in the number of particles gradually increased in the whole polymerization process. Combined with the previous work (Colloid and Polymer Science, 2014, 292, 519-525), it was concluded that particle coagulation easily took place in cationic emulsion polymerization of styrene. Thus, the narrow particle size distribution Downloaded by [FU Berlin] at 05:29 07 July 2015 2 cationic latexes with particle scale between 50nm and 80nm, 30wt% solid content could be prepared in a short reaction time.
“…[10] Cationic latex soap-free emulsion polymerization in the presence of cationic initiator. [11][12][13] It is very difficult to control the particle size distribution of the final latex, even though these researches provide a substantial foundation for controlling particle size distribution and particle morphology.…”
A novel approach to synthesize narrow particle size distribution cationic latex particles based on styrene and butyl acrylate was proposed. The effect of monomer/water ratios, surfactant (cetyltrimethylammonium chloride) concentrations and monomer compositions on the evolution of particle size, distribution, number and morphology as a function of monomer conversion were concerned in order to confirm the optimum polymerization condition. As expected, the particle size of the ultima latex increased with monomer/water ratios and styrene contents decreased with increasing surfactant concentrations. Continue nucleation phenomena occurred when monomer/water ratio was lesser than 30/70, resulting in the number of particles gradually increased in the whole polymerization process. Combined with the previous work (Colloid and Polymer Science, 2014, 292, 519-525), it was concluded that particle coagulation easily took place in cationic emulsion polymerization of styrene. Thus, the narrow particle size distribution Downloaded by [FU Berlin] at 05:29 07 July 2015 2 cationic latexes with particle scale between 50nm and 80nm, 30wt% solid content could be prepared in a short reaction time.
“…Cationic polymer particles have received considerable attention because of their unique properties such as a small size with high specific surface area, good mechanical and chemical stability, low surface tension, cationic surface charge, and also due to application as flocculants in mining, water filtration, and sewage treatment, as antimicrobial agents, and in drug delivery systems [1][2][3][4]. Researchers have devoted their time and efforts to study the physical and chemical properties of cationic polyelectrolytes because of their potential to shed light on the fundamental properties of proteins and nucleic acids [5].…”
Cationic colloidal unimolecular polymer (CUP) particles were prepared by using a lower concentration of the quaternary ammonium functional copolymers during the process of water reduction. True nanoscale (diameter 3-9 nm), zero-volatile organic content (VOC), spheroidal CUP particles, and self-stabilized via electro-repulsion of surface cationic groups were obtained. The viscosity of the cationic CUP systems w as influenced by the electroviscous effects arising from the surface charge and the associated surface water layer. The density of surface water was 1.6 % greater than the bulk water density which was attributed to the structuring of water around charged quaternary ammonium groups. The equilibrium surface tension values decreased linearly with increasing concentration and surface charge density of CUP particles due to a greater reduction in surface energy. The rate of surface tension reduction determined by maximum bubble pressure method decreased with increasing concentration and the molecular weight of the CUP due to diffusion effects.
“…2 Common methods for preparing positively charged colloids cover dispersion, precipitation, emulsion, multiple swelling and seeded polymerizations from various cationic monomers, such as 2vinylpyridine, 4-vinylpyridine, 2-(diethylamino)ethyl methacrylate, 2-(dimethylamino)ethyl methacrylate (DMAEMA). 3,4 Protonated polymer particles based on DMAEMA possess interesting properties, which endow them with a potential for various applications. Poly [2-(dimethylamino)ethyl methacrylate] (PDMAEMA) is a water-soluble polymer and, due to its positive charge, PDMAEMA and its copolymers are able to form electrostatic complexes with anionic biomacromolecules, such as DNA and RNA, and are oen used for gene delivery.…”
Quaternized 167 nm poly[2-(dimethylamino)ethyl methacrylate-co-ethylene dimethacrylate] nanogel by dispersion polymerization in water/2-methoxyethanol medium induced death of pathogenic Staphylococcus aureus and Acinetobacter baumannii.
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