期刊
JOURNAL OF POLYMER SCIENCE
卷 58, 期 6, 页码 843-851出版社
WILEY
DOI: 10.1002/pol.20190200
关键词
amphiphilic block copolymer; dual stimuli-responsive; PNIPAM; RAFT polymerization; self-assembly
资金
- Indian Institute of Technology Kharagpur
- DWI, RWTH Aachen University, Germany
- DST-DFG
- German Academic Exchange Services (DAAD)
This investigation describes the synthesis of a dual stimuli-responsive, amphiphilic ABC tri-block copolymer (BCP) based on the functional monomers via RAFT polymerization. In this case, ABC-type BCP was prepared based on N-isopropylacrylamide, n-butyl acrylate, and 4-vinylpyridine in DMF solvent using cyanomethyl dodecyl trithiocarbonate as the RAFT agent and azobisisobutyronitrile as a thermal initiator in a subsequent macro-RAFT approach, respectively. The BCPs were characterized by SEC, H-1-NMR, FTIR spectroscopy, and DSC analyses. Temperature and pH-dependent properties of the smart BCP micelles in aqueous medium were investigated using dynamic light scattering. Transmission electron microscopic images were taken at cryogenic and dry conditions to study the morphology of molecular assemblies of block copolymers in an aqueous medium. The phase and topographical images were captured by atomic force microscopy to understand the assembly of block copolymers in solvents of different polarities. The morphology of BCP micelles was transformed from flower-like to spherical in the presence of solvents with different polarities (H2O or CHCl3).
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