Citation: Xiao-yun Liu, Jian-mao Yang, Liu-sheng Zha, Zi-jun Jiang. Self-assembly of Hollow PNIPAM Microgels to Form Discontinuously Hollow Fibers[J]. Chinese Journal of Polymer Science, ;2014, 32(11): 1544-1549. doi: 10.1007/s10118-014-1508-8 shu

Self-assembly of Hollow PNIPAM Microgels to Form Discontinuously Hollow Fibers

Xiao-yun Liu ¹ ,
Jian-mao Yang ^2,3,4 ,
Liu-sheng Zha ^2,3,4,, ,
Zi-jun Jiang ⁵

1.
Research Center for Analysis and Measurement, Donghua University, Shanghai 201620, China
2.
1. Research Center for Analysis and Measurement, Donghua University, Shanghai 201620, China
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2. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China
4.
5.
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China

Corresponding author: Liu-sheng Zha,
Received Date: 24 January 2014
Revised Date: 13 March 2014

Fund Project: This work was financially supported by the National Natural Science Foundation of China (Nos. 51073033 and 51373030) and the Fundamental Research Funds for the Central Universities (No. 2232014D3-43).

A new kind of hollow hydrogel microfiber with discontinuous hollow structure was prepared by an ice-segregation-induced self-assembly process. Monodisperse thermo-responsive hollow poly(N-isopropylacrylamide) (PNIPAM) microgels were first synthesized by seed precipitation polymerization using colloidal SiO2 nanoparticles as seeds, followed by removing the silica cores of the formed SiO2/PNIPAM core/shell composite microgels with hydrofluoric acid. Then, the discontinuously hollow hydrogel microfibers were produced by unidirectional freezing of 1 wt% hollow PNIPAM microgel aqueous dispersion in liquid nitrogen bath, followed by freeze-drying to remove the formed ice crystals. Many orderly arrayed dents were observed on the surfaces of the hydrogel microfibers by field-emission scanning electron microscopy, indicating that they are constructed by closely packed monodisperse hollow PNIPAM microgels. The effect of freezing method and the hollow microgel concentration in the aqueous dispersion on the morphological structure of the hollow hydrogel microfibers was investigated.
- Discontinuously hollow microfiber,
- Ice-segregation-induced self-assembly,
- Thermo-responsiveness,
- N-isopropylacrylamide,
- Microgel
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