Chinese Journal of Applied Chemistry ›› 2019, Vol. 36 ›› Issue (6): 631-640.DOI: 10.11944/j.issn.1000-0518.2019.06.180263

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Preparation and Properties of Sulfonic Waterborne Polyurethane Hydrogels with Sodium N,N-Bis (2-hydroxyethyl)-2-aminoethane Sulfonate as Chain Extender

GUO Xiaoyan,CHENG Xiaoqi,ZHANG Liangliang,HUANG Yiping(),XU Gewen,BAO Junjie   

  1. Key Laboratory of Green Polymer Materials of Anhui Province,College of Chemistry and Chemical Engineering,Anhui University,Hefei 230601,China
  • Received:2018-08-10 Accepted:2018-12-22 Online:2019-06-01 Published:2019-06-03
  • Contact: HUANG Yiping
  • Supported by:
    Supported by the Natural Science Foundation of Anhui Province(No.1808085QE173), the Science Research Project of the Anhui Province Universities(No.KJ2017A031)

Abstract:

A series of sulfonic waterborne polyurethane hydrogels(WPUHs) was prepared by in-situ polymerization using 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate(IPDI), polyethylene glycol(PEG) and diethylene glycol(DEG) as raw materials, and 2,2-dimethylol propionic acid(DMPA) and N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid sodium salt(BES-Na) as hydrophilic chain extenders. The structure and properties of the gels are characterized by X-ray diffractometer, thermogravimetric analyzer and electro-mechanical universal testing machine. The results show that the thermal stability of the hydrogels increases gradually with the increase of BES-Na mass fraction, and the compressive strength and compressive modulus of WPUH7 hydrogel containing 3.46% mass fraction BES-Na are 2.9 times and 3.6 times higher than those of the WPUH1 hydrogel containing 0% mass fraction BES-Na, respectively. The swelling ratio increases from 20.55 to 29.25, and the increase of BES-Na mass fraction has a significant influence on the initial process of hydrogel swelling. At the same time, the swelling ratio of WPUH7 hydrogel increases from 17.64 to 33.80 in the range of 10~45 ℃ and from 20.74 to 70.69 in the range of pH 2~10, indicating that hydrogels have good sensitivity to temperature and pH.

Key words: polyurethane hydrogel, sulfonic group, swelling kinetics, temperature and pH sensibility