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Synthesis of Size‐Controlled Acid‐Resistant Hybrid Calcium Carbonate Microparticles as Templates for Fabricating “Micelles‐Enhanced” Polyelectrolyte Capsules by the LBL Technique
Author(s) -
Li Xiaodong,
Hu Qiaoling,
Yue Linhai,
Shen Jiacong
Publication year - 2006
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200600349
Subject(s) - copolymer , micelle , calcium carbonate , polyelectrolyte , acrylic acid , amphiphile , materials science , chemical engineering , microparticle , nanoparticle , polymer chemistry , chemistry , nanotechnology , organic chemistry , aqueous solution , polymer , composite material , engineering
Size‐controlled, low‐dispersed calcium carbonate microparticles were synthesized in the presence of the amphiphilic block copolymer polystyrene‐ b ‐poly(acrylic acid) (PS‐ b ‐PAA) by modulating the concentration of block copolymer in the reactive system. This type of hybrid microparticles have acid‐resistant properties. By investigating the aggregation behaviors of PS‐ b ‐PAA micelles by transmission electron microscopy (TEM), the mechanism of hybrid calcium carbonate formation illustrated that the block copolymer served not only as “pseudonuclei” for the growth of calcium carbonate nanocrystals, but also forms the supramicelle congeries, a spherical framework, as templates for calcium carbonate nanocrystal growth into hybrid CaCO 3 particles. Moreover, this pilot study shows that the hybrid microparticle is a novel candidate as a template for fabricating multilayer polyelectrolyte capsules, in which the block copolymer is retained within the capsule interior after core removal under soft conditions. This not only facilitates the encapsulation of special materials, but also provides “micelles‐enhanced” polyelectrolyte capsules.