کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5186427 | 1381104 | 2009 | 7 صفحه PDF | دانلود رایگان |
Asymmetric hollow particles were fabricated from the self-assembly of block copolymers poly(N-isopropylacrylamide)-block-poly(4-vinylpyridine) (PNIPAM-b-P4VP) and poly(ethylene glycol)-block-poly(acrylic acid) (PEG-b-PAA) in water. The shell of the asymmetric hollow particle was a polyion complex layer which acted as a semipermeable membrane. Outside the shell were PEG hydrophilic layers and inside were thermo-sensitive PNIPAM chains. When temperature was higher than the lower critical solution temperature (LCST) of PNIPAM, it became insoluble and collapsed onto the shrinking shell to form a hydrophobic lumen. The whole process was characterized by dynamic light scattering (DLS), static light scattering (SLS), transmission electron microscopy (TEM), atom force microscopy (AFM) and nuclear magnetic resonance (NMR).
Journal: Polymer - Volume 50, Issue 3, 28 January 2009, Pages 825-831