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

Xiao-yun Liu; Jian-mao Yang; Liu-sheng Zha; Zi-jun Jiang

doi:10.1007/s10118-014-1508-8

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

Updated：2021-06-21

- Self-assembly of Hollow PNIPAM Microgels to Form Discontinuously Hollow Fibers
- Chinese Journal of Polymer Science Vol. 32, Issue 11, Pages: 1544-1549(2014)
- Affiliations：
  
  a.Research Center for Analysis and Measurement, Donghua University, Shanghai 201620, China
  b.State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China
- Author bio：
  
  **Liu-sheng Zha (查刘生), E-mail: lszha@dhu.edu.cn
- Funds：
- DOI：10.1007/s10118-014-1508-8
  CLC：
- Received：24 January 2014，
  
  Revised：2014-03-04，
  
  Accepted：13 March 2014，
  
  Published：2014-11
- Accepted：
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Xiao-yun Liu, Jian-mao Yang, Liu-sheng Zha, et al. Self-assembly of Hollow PNIPAM Microgels to Form Discontinuously Hollow Fibers[J]. Chinese Journal of Polymer Science, 2014, 32(11): 1544-1549.
DOI：

Xiao-yun Liu, Jian-mao Yang, Liu-sheng Zha, et al. 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.

摘要

Abstract

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(

-isopropylacrylamide) (PNIPAM) microgels were first synthesized by seed precipitation polymerization using colloidal SiO

nanoparticles as seeds

followed by removing the silica cores of the formed SiO

/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.

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