Chinese Journal of Applied Chemistry ›› 2018, Vol. 35 ›› Issue (11): 1301-1308.DOI: 10.11944/j.issn.1000-0518.2018.11.180013

• Full Papers • Previous Articles     Next Articles

Effect of Non-freezing Water on the Mechanical Properties of Microspherical Composite Hydrogels

LIANG Xuechenab,DENG Yukunab,PEI Xiaopengac,ZHAI Kankanac,XU Kuna*(),TAN Yinga*(),WANG Pixina   

  1. aKey Laboratory of Polymer Ecomaterials,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China
    bUniversity of Chinese Academy of Sciences,Beijing 100049,China
    cUniversity of Science and Technology of China,Hefei 230026,China
  • Received:2018-01-16 Accepted:2018-03-15 Online:2018-10-31 Published:2018-10-31
  • Contact: XU Kun,TAN Ying
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.51673191, No.21774124), the Jilin Province Science and Technology Development Project(No.20160101306JC, No.201603101YY)

Abstract:

The aim of this paper is to study the relationship between the ability to combine water and the toughness of hydrogel by means of differential scanning calorimetry(DSC). N-butyl methacrylate(BMA) or 2,2,3,4,4,4-hexafluorobutyl methacrylate(HFBMA) and allylamine were chosen as monomers to synthesize core-shell nanospheres(named BMA nanosphere or HFBMA nanosphere). Then, the two nanospheres were used as macromolecular initiators and crosslinking agents to prepare nanospherical composite hydrogels(named BMA-H hydrogel or HFBMA-H hydrogel). DSC, Fourier transform infrared spectrometer(FTIR) and transmission electron microscopy(TEM) were used to characterize the structures and properties of hydrogels. The results of mechanical performance analysis indicate that the HFBMA-H hydrogel has better mechanical properties and its tensile strength and fracture elongation are up to 280 kPa and 3960%, respectively, which are much higher than those of BMA-H hydrogel(101 kPa, 2700%). DSC was used to investigate the state and proportion of water in composite hydrogels with different kinds of nanospheres. The results show that the non-freezing water content of HFBMA-H hydrogel is far higher than that of BMA-H hydrogel under the same water content, and the plasticizing effect of non-freezing water has an important effect on the mechanical strength of the hydrogel.

Key words: core-shell microgel, composite hydrogel, differential scanning calorimetry, non-freezing water