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標題: Thermoresponsive Interpolymeric Complex Assemblies from Co-association of Linear PAAc Homopolymers with PNIPAAm Segments Containing PAAc-Based Graft Copolymer
作者: Chiang, W.H.
Hsu, Y.H.
Chen, Y.W.
Chern, C.S.
Chiu, H.C.
關鍵字: graft copolymers;hydrogen bonding;micelles;phase separation;self-assembly;diblock copolymers;polymeric micelles;structural-changes;block-copolymers;light-scattering;mpeg grafts;ph;water;phase;peg
Project: Macromolecular Chemistry and Physics
期刊/報告no:: Macromolecular Chemistry and Physics, Volume 212, Issue 17, Page(s) 1869-1878.
In aqueous solution at pH 3.0 and 20 degrees C, poly(acrylic acid)-g-poly(N-isopropylacrylamide)/monomethoxy poly(ethylene glycol) (PAAc-g-PNIPAAm/mPEG) can assemble spontaneously with linear poly(acrylic acid) homopolymers (homoPAAc) into interpolymeric complexes (IPC). The resultant IPC assemblies exhibit a core-corona structure consisting of a hydrophobic PAAc/PNIPAAm complex core surrounded by hydrated PNIPAAm/mPEG coronas. At temperatures above 30 degrees C, the assemblies transform into a core-shell-corona micelle. Highly loose, irregular IPC assemblies developed at a reduced weight ratio of homoPAAc with the graft copolymer at 20 degrees C show particle size enlargement and structural variation above 30 degrees C. By contrast, co-assembly of long homoPAAc chains with the copolymer leads to large aggregates comprising several IPC assemblies interconnected by homoPAAc chain segments.
ISSN: 1022-1352
DOI: 10.1002/macp.201100124
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