Nuclear Techniques ›› 2016, Vol. 39 ›› Issue (2): 20202-020202.doi: 10.11889/j.0253-3219.2016.hjs.39.020202

• LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS • Previous Articles     Next Articles

Preparation of G-CNTs/PAAm hydrogel and its properties

YE Tiannan, LIU Hanzhou, YAN Siqi, CHANG Wenjuan, FAN Wenhui, YU Xiao, WEN Wanxin   

  1. School of Radiation Medicine and Protection, Medical College of Soochow University, Jiangsu Provincial Key Laboratory of Radiation Medicine and Protection, Suzhou 215123, China
  • Received:2015-12-08 Revised:2016-01-20 Online:2016-02-10 Published:2016-02-17
  • Supported by:

    Supported by National Natural Science Foundation of China (No.11375125), Postdoctoral Science Foundation of China (No.2015M571808), Natural Science Foundation of Jiangsu Province (No.BK20150310)

Abstract:

Background: Hydrogel has been widely applied to drug delivery, tissue engineering, water treatment, water retention and separation, etc. Mechanical properties of hydrogel can be improved by combining with other materials without changing its intrinsic properties. Due to the excellent properties of carbon nanotubes (CNTs) such as mechanical strength, hydrogen storage, high specific surface area, they can be applied to selective absorption or separation of hydrogen isotope. CNTs composite hydrogel may combine these excellent properties. Purpose: This study aims at a new absorbent material fabricated by irradiation-induced grafting and crosslinking two-steps method. Methods: The G-CNTs/PAAm hydrogel with Poly(acrylamide) and CNTs grafted with acrylic acid were fabricated by irradiation-induced grafting and crosslinking two-steps method. Properties of G-CNTs and CNTs were investigated by Fourier transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TGA), and transmission electron microscope (TEM). X-ray diffraction (XRD) and Brunauer-Emmett-Teller specific surface area (BET) were used to characterize PAAm hydrogel and G-CNTs/PAAm hydrogel. Liquid water and vaporous water absorption ability of G-CNTs/PAAm hydrogel and PAAm hydrogel were tested at room temperature. Results: Many objects and pieces appeared on the surface of G-CNTs. There were two new absorption bands at 1 726 cm-1 and 1 452 cm-1 in the FTIR spectra of the G-CNTs which indicates that acrylic acid has been successfully introduced onto the surface of CNTs by Co-60 irradiation grafting. According to TGA curves of CNTs and G-CNTs, grafting ratio of G-CNTs (15%) could be calculated. The gel content of G-CNTs/PAAm hydrogel and PAAm hydrogel were 95.6% and 94.7%, respectively. Compared with PAAm hydrogel, two new peaks at 26.5° and 43.2° could be found in the XRD pattern of G-CNTs/PAAm hydrogel associated with CNTs and G-CNTs. The surface area of G-CNTs/PAAm hydrogel with 30 m2·g-1 was two times larger than that of PAAm hydrogel with 12 m2·g-1. Conclusion: Due to the larger surface area of G-CNTs/PAAm hydroge, better vaporous water absorption ability was shown compared with the PAAm hydrogel. Hydrophilic and dispersibility of CNTs in water have been improved and the crystal lattices of CNTs still exist after being grafted. The existence of G-CNTs improves the surface area and stables the structure of G-CNTs/PAAm hydrogel.

Key words: CNTs, Hydrogel, Radiation grafting, Radiation crosslinking

CLC Number: 

  • TL75