劉昌蕾同學論文在Macromol Rapid Comm發表
A novel and facile bottom-up strategy for preparing core-shell nanofibers with selectively localized carbon
nanotubes was developed by using hierarchical composite micelles of crystalline-coil copolymer and carbon nanotubes as the building blocks. An amphiphilic di-block copolymer of poly (p-dioxanone) (PPDO) and PEG (polyethylene
glycol) functionalized with pyrene moieties at the chain ends of PPDO blocks (Py-PPDO-b-PEG) was designed for constructing composite micelles with multiwalled carbon
nanotubes (MWCNTs).
The self-assembly
of Py-PPDO-b-PEG and MWCNTs was co-induced
by the crystallization of PPDO blocks and the π-π stacking interactions between pyrene moieties and MWCNTs, resulting
in composite micelles with “shish-kebab”-like nanostructure. A mixture
of composite micelles and polyvinyl alcohol (PVA) water solution was then used as the spinning solution for preparing
electrospun nanofibers. The morphologies of the
nanofibers with different composition were investigated by scanning electron microscope
(SEM) and transmission
electron microscope (TEM). The results suggested the MWCNTs selectively localized in the core of
the nanofibers of MWCNTs/Py-PPDO-b-PEG/PVA.
The alignment and interfusion
of composite micelles during formation of nanofibers may confine the
carbon nanotube in the hydrophobic core region. In contrast, the copolymer
without pyrene moieties cannot form composite micelles, thus these nanofibers showed selective localization of MWCNTs in the
PVA shell region.