Soap-free poly（methyl methacrylate-ethyl acrylate-methacrylic acid） latex particles with narrow size distribution were synthesized by seeded emulsion polymerization, and the porous particles were created by a stepwi...Soap-free poly（methyl methacrylate-ethyl acrylate-methacrylic acid） latex particles with narrow size distribution were synthesized by seeded emulsion polymerization, and the porous particles were created by a stepwise alkali/acid treatment method. Effects of acid treatment conditions on the particle morphology were investigated. Results show that one to three pores were formed inside most of particles after post-treatment. At pH 7.0, when the treatment temperature was lower than 70℃, the size of particles and the volume of pores remained almost unchanged, and these two values increased significantly when the temperature was higher than 70℃. Both the particle size and the pore volume decreased with the increase of initial pH value and treatment time in the acid treatment. As the pH was below 4.0 and the treatment time was longer than 180 min, the particles shrunk in size.展开更多
In this paper we review our work on self-assembly of the system, poly（ethylene oxide）-poly（propylene oxide）-poly（elhylene oxide） （PEO-PPO-PEO） block copolymers, which is a kind of macromolecular complex fluids...In this paper we review our work on self-assembly of the system, poly（ethylene oxide）-poly（propylene oxide）-poly（elhylene oxide） （PEO-PPO-PEO） block copolymers, which is a kind of macromolecular complex fluids. The control of self-assembly could be obtained by adding inorganic salts or aliphatic alcohols. By self-assembly of amphiphilic block copelymers a microemulsion phase is formed which could be applied in micelle extraction, such as hollow-fiber membrane micelle extraction, magnetic micelle extraction and immobilized micelle extraction.展开更多
Inverse microemulsion copolymerizations of acrylamide(AM) with acrylimide ethyltrimethylammonium chloride(AETMAC) have been carried out in the systems of non ionic emulsifier SPAN 80 and anionic emulsifier sodium di(2...Inverse microemulsion copolymerizations of acrylamide(AM) with acrylimide ethyltrimethylammonium chloride(AETMAC) have been carried out in the systems of non ionic emulsifier SPAN 80 and anionic emulsifier sodium di(2 ethyl) hexyl phosphate(DOP), respectively, and the effects of the emulsifiers on the copolymerization rate and reactivity ratio have been investigated. The copolymerization rate was found higher in DOP system and the reactivity ratio of AETMAC was lower in SPAN 80 system than in DOP system and aqueous solution. The results are explained in terms of the difference in tightness of emulsifier layers.展开更多
基金The research was supported by the National 863 Project of China(No.2001AA242041).
文摘Soap-free poly（methyl methacrylate-ethyl acrylate-methacrylic acid） latex particles with narrow size distribution were synthesized by seeded emulsion polymerization, and the porous particles were created by a stepwise alkali/acid treatment method. Effects of acid treatment conditions on the particle morphology were investigated. Results show that one to three pores were formed inside most of particles after post-treatment. At pH 7.0, when the treatment temperature was lower than 70℃, the size of particles and the volume of pores remained almost unchanged, and these two values increased significantly when the temperature was higher than 70℃. Both the particle size and the pore volume decreased with the increase of initial pH value and treatment time in the acid treatment. As the pH was below 4.0 and the treatment time was longer than 180 min, the particles shrunk in size.
基金supported by the National Natural Science Foundation of China(NO.20221603,NO.20490200 and NO.20273075)Chinese Academy of Sciences.
文摘In this paper we review our work on self-assembly of the system, poly（ethylene oxide）-poly（propylene oxide）-poly（elhylene oxide） （PEO-PPO-PEO） block copolymers, which is a kind of macromolecular complex fluids. The control of self-assembly could be obtained by adding inorganic salts or aliphatic alcohols. By self-assembly of amphiphilic block copelymers a microemulsion phase is formed which could be applied in micelle extraction, such as hollow-fiber membrane micelle extraction, magnetic micelle extraction and immobilized micelle extraction.
文摘Inverse microemulsion copolymerizations of acrylamide(AM) with acrylimide ethyltrimethylammonium chloride(AETMAC) have been carried out in the systems of non ionic emulsifier SPAN 80 and anionic emulsifier sodium di(2 ethyl) hexyl phosphate(DOP), respectively, and the effects of the emulsifiers on the copolymerization rate and reactivity ratio have been investigated. The copolymerization rate was found higher in DOP system and the reactivity ratio of AETMAC was lower in SPAN 80 system than in DOP system and aqueous solution. The results are explained in terms of the difference in tightness of emulsifier layers.
