Journal of Radiation Research and Radiation Processing ›› 2019, Vol. 37 ›› Issue (4): 1-040201-6.doi: 10.11889/j.1000-3436.2019.rrj.37.040201

• RADIATION CHEMISTRY •     Next Articles

Preparation of dual-shape memory elastomers through electron-beam radiation-induced crosslinking of an olefin block copolymer

MAIMAITIMING Aizezi1,2(),YANG Junjie3,HUANG Chenghui3,ZHANG Mingxing1,2,WANG Minglei1,2,ZHANG Maojiang1,2,XING Zhe1,WU Guozhong1,3()   

  1. 1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. Zhejiang Sinco-polymer Material R&D Centre, Jiaxing 314100, China
  • Received:2019-02-22 Revised:2019-04-15 Accepted:2019-04-15 Online:2019-08-20 Published:2019-08-21
  • Contact: Guozhong WU E-mail:aizezi@sinap.ac.cn;wuguozhong@sinap.ac.cn
  • About author:MAIMAITIMING Aizezi(male) was born in December 1986, and obtained his master’s degree from Zhejiang University in 2015. Now he is a doctoral candidate at Shanghai Institute of Applied Physics, Chinese Academy of Sciences, majoring in inorganic chemistry, engaging in the preparation of shape memory polymer by radiation crosslinking, supercritical carbon dioxide assisted foaming, and polymer product engineering. E-mail: aizezi@sinap.ac.cn
  • Supported by:
    the Science Challenge Project(TZ2018004)

Abstract:

The effects of electron-beam radiation, under vacuum, on the tensile property, re-crystallized structure, and dual-shape memory effect of an olefin block copolymer (OBC) were studied through stress-strain measurements, X-ray diffraction (XRD), and observation of strain recovery. The results showed that the gel content and strength at 100% strain increased for an absorbed dose of 50~250 kGy, whereas the elongation at break decreased with the increasing absorbed doses. The tensile strength increased when the absorbed dose was 50~150 kGy and decreased at 150~250 kGy. The XRD results demonstrated that electron-beam-induced selective crosslinking in the soft segment of the OBC did not influence the recrystallized structure but that crosslinking at higher doses slightly influenced the diffusion and rearrangement of the hard segment during recrystallization. The crosslinked OBC samples exhibit outstanding melt strength and dual-shape memory effect based on the observation of strain recovery. Both the shape fixity and recovery ratio are greater than 93%.

Key words: Olefin block copolymer, Electron-beam radiation, Crosslinking, Crystal structure, Shape memory effect

CLC Number: 

  • TL13