Liyan Qiu et al 2007 Nanotechnology 18 475602 doi:10.1088/0957-4484/18/47/475602
Liyan Qiu1,3, Jianxiang Zhang1,2, Meiqiu Yan1, Yi Jin1 and Kangjie Zhu2
Show affiliationsA novel series of amphiphilic polyphosphazenes (PNIPAm/AA-PPP) containing hydrophilic oligo-(N-isopropylacrylamide) (oligo-NIPAm) and various hydrophobic aliphatic amines as co-substitutes was synthesized via a two-step substitution reaction. The extraction and solubilization of water-soluble substances such as fluorescein sodium and trypan blue from an aqueous phase into the chloroform phase were supposed to result from the formation of polyphosphazene reverse self-assemblies in the organic phase. A field emission scanning electronic microscope was adopted to characterize the morphology of reverse assemblies in chloroform. Additionally, a significant improvement of encapsulation and release profiles of water-soluble substances was found for poly(lactic-co-glycolic acid) (PLGA) microparticles in the presence of amphiphilic copolymers, which was associated with the chemical structure of copolymers as well as the content of copolymer in the microparticles.
Soft matter, liquids and polymers
Issue 47 (28 November 2007)
Received 1 August 2007, in final form 6 September 2007
Published 19 October 2007
Liyan Qiu et al 2007 Nanotechnology 18 475602
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