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Loose‐Fit Polypseudorotaxanes Fabricated by γ ‐CDs Threaded Onto a Single PNIPAAm‐PEG‐PNIPAAm Chain in Aqueous Solution
Author(s) -
Gao Peng,
Wang Jin,
Wang PeiJing,
Ye Lin,
Zhang AiYing,
Feng ZengGuo
Publication year - 2012
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201200105
Subject(s) - copolymer , aqueous solution , peg ratio , polymer , polymer chemistry , fourier transform infrared spectroscopy , materials science , chemical engineering , chemistry , composite material , finance , engineering , economics
When γ ‐CDs are added to an aqueous solution of PNIPAAm‐ b ‐PEG‐ b ‐PNIPAAm block copolymer, they are threaded onto the polymer chains to give loose‐fit polypseudorotaxanes (PPRs). The inclusion complexation shows a marked dependence on the length of the PNIPAAm blocks although the threaded γ ‐CDs are preferably located on the central PEG block. The structure of the resulting PPRs is characterized by using XRD, 1 H and 13 C CP/MAS NMR, TGA FTIR, and DSC analyses. Because of the mismatched fit between the guest polymer chain and the cavity of the host γ ‐CDs, these PPRs may be promising in applications as solid stimuli‐responsive materials.