Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (11): 20230101.doi: 10.7503/cjcu20230101

• Polymer Chemistry • Previous Articles     Next Articles

Preparation, Properties and Shape Memory Mechanism of Polyacrylate-based Polymer Crosslinked by Self-assembled Core-shell Nano-microdomain

LI Mingfei1, LYU Jianing1, LI Xingjian1(), DING Xiaobin2   

  1. 1.College of Materials Science and Engineering,Linyi University,Linyi 276000,China
    2.Chengdu Institute of Organic Chemistry,Chinese Academy of Sciences,Chengdu 610041,China
  • Received:2023-03-09 Online:2023-11-10 Published:2023-08-29
  • Contact: LI Xingjian E-mail:lixingjian1314@163.com
  • Supported by:
    the National Natural Science Foundation of China(22275076);the Natural Science Foundation of Shandong Province, China(ZR2020QE092);the 2023 National College Student Innovation and Entrepreneurship Training Program, China

Abstract:

The polyacrylate-based shape memory polymer(SMP) with self-assembled core-shell nano-microdomains was prepared by UV-initiated free-radical polymerization of the active core-shell nanomicelles formed by self-assembly of active Pluronic F127 triblock copolymer end-capping acrylate groups as multifunctional nano-crosslinker and hydroxyethyl acrylate and acrylic acid as co-monomers. The thermal properties, dynamic thermo-mechanical properties and mechanical properties of the polyacrylate-based SMPs were characterized by differential scanning calorimeter, dynamic thermo-mechanical analyzer and universal tensile testing machine. The results showed that the glass transition temperature, room temperature modulus, modulus ratio of upper and lower glass transition, tensile strength and elongation at break of the SMPs decreased gradually with the decreasing concentration of acrylate monomer. The SMP system exhibited both high strength and high toughness. The shape fixity ratio(Rf), shape recovery ratio(Rr), and shape recovery rate(Vr) of the SMPs were quantitatively characterized. The results showed that when the monomer concentration exceeded 1.97 mol/L, the SMP exhibited excellent shape memory performance, with Rf of more than 97%, Rr of above 98% and Vr of over 8.8%/min. Finally, the shape memory mechanism of the SMP system was analyzed by stress relaxation.

Key words: Shape memory polymer, Polyacrylate, Core-shell nano-microdomain, Shape memory effect

CLC Number: 

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