Journal of Radiation Research and Radiation Processing ›› 2020, Vol. 38 ›› Issue (4): 25-32.doi: 10.11889/j.1000-3436.2020.rrj.38.040201

• RADIATION CHEMISTRY • Previous Articles    

Radiation synthesis and properties of gelatin/polyacrylic acid/poly(N-isopropyl acrylamide) shape-memory hydrogels with high strength

CHEN Ken,PENG Jing(),LI Jiuqiang,ZHAI Maolin()   

  1. Radiochemistry and Radiation Chemistry Key Laboratory of Fundamental Science, College of Chemistry and Molecular Engineering, Beijing National Laboratory for Molecular Science, Peking University, Beijing 100871, China
  • Received:2020-04-07 Revised:2020-04-30 Accepted:2020-04-30 Online:2020-08-20 Published:2020-08-13
  • Contact: PENG Jing,ZHAI Maolin E-mail:jpeng@pku.edu.cn;mlzhai@pku.edu.cn
  • About author:CHEN Ken (male) was born in November 1993, and obtained his bachelor’s degree from Jilin University in 2015. Now he is a graduate student at College of Chemistry and Molecular Engineering, Peking University
  • Supported by:
    National Natural Science Foundation of China(11875078)

Abstract:

A novel gelatin/polyacrylic acid/poly(N-isopropyl acrylamide) shape-memory hydrogel (GAN) with temperature and pH response and high strength was prepared by two-step irradiation method, with gelatin as matrix, acrylic acid (AAc) and N-isopropyl acrylamide (NIPAm) as monomers, and N,N′-methlene bisacrylamide (MBA) as crosslinking agent. The structure, morphology, mechanical properties, and shape-memory behavior of GAN were investigated in detail. The results showed that GAN has a dense network structure, and excellent mechanical properties with the maximum tensile strength up to (5.4±0.3) MPa, and the maximum elongation at break of 745%. GAN’s shape recovery time at 60 ℃ and pH=12.8 can be controlled within 10 s and 15 min, with a shape fixation rate and shape recovery rate above 90%, respectively. This work provides a new method for the preparation of environmentally responsive high-strength shape-memory hydrogels.

Key words: Shape-memory hydrogel, Gelatin, Acrylic acid, N-isopropyl acrylamide, Radiation synthesis

CLC Number: 

  • TL13