Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Nanoparticles of Block Ionomer Complexes from Double Hydrophilic Poly(acrylic acid)-b-poly(ethylene oxide)-bpoly(acrylic acid) Triblock Copolymer and Oppositely Charged Surfactant | Nanoscale Res Lett 2010 5 89-95 DOI s11671-009-9448-x NANO EXPRESS Nanoparticles of Block Ionomer Complexes from Double Hydrophilic Poly acrylic acid -b-poly ethylene oxide -b-poly acrylic acid Triblock Copolymer and Oppositely Charged Surfactant Zhiping Peng Yuelong Sun Xinxing Liu Zhen Tong Received 5 August 2009 Accepted 24 September 2009 Published online 6 October 2009 to the authors 2009 Abstract The novel water-dispersible nanoparticles from the double hydrophilic poly acrylic acid -b-poly ethylene oxide -b-poly acrylic acid PAA-b-PEO-b-PAA triblock copolymer and oppositely charged surfactant dodecyltrimethyl ammonium bromide DTAB were prepared by mixing the individual aqueous solutions. The structure of the nanoparticles was investigated as a function of the degree of neutralization DN by turbidimetry dynamic light scattering DSL -potential measurement and atomic force microscope AFM . The neutralization of the anionic PAA blocks with cationic DTAB accompanied with the hydrophobic interaction of alkyl tails of DTAB led to formation of core-shell nanoparticles with the core of the DTAB neutralized PAA blocks and the shell of the looped PEO blocks. The water-dispersible nanoparticles with negative -potential were obtained over the DN range from to and their sizes depended on the DN. The looped PEO blocks hindered the further neutralization of the PAA blocks with cationic DTAB resulting in existence of some negative charged PAA-b-PEO-b-PAA backbones even when DN . The spherical and ellipsoidal nature of these nanoparticles was observed with AFM. Z. Peng School of Chemistry and Chemical Engineering South China University of Technology 510640 Guangzhou China e-mail zppeng@ Y. Sun X. Liu Z. Tong H Research Institute of Materials Science South China University of Technology 510640 Guangzhou China e-mail mcztong@ Keywords Nanoparticles Block ionomer complexes Water-dispersible Double hydrophilic triblock copolymer Surfactant
