Citation: Mao-lin Zhang, Xing-xing Ji, Xin-yan Shi. Study on the Key Factors of Reversible Plasticity Shape Memory of Polynorbornene[J]. Acta Polymerica Sinica, ;2019, 50(9): 949-956. doi: 10.11777/j.issn1000-3304.2019.19050 shu

Study on the Key Factors of Reversible Plasticity Shape Memory of Polynorbornene

Key Laboratory of Rubber-plastics, Ministry of Education, School of Polymer Science and Engineering, Qingdao University of Science & Technology, Qingdao 266042

Corresponding author: Xin-yan Shi, lindashi88@hotmail.com
Received Date: 13 March 2019
Revised Date: 8 April 2019

Compared to conventional shape memory polymers, the reversible plasticity shape memory polymers (RPSMPs) emphasize deformation and fixation at the same temperature below its transition temperature. Due to the advantages of low energy consumption and simple deformation, it has received much attention in the fields of military, aerospace and biomedicine. So it is important to understand its whole deformation process and key influencing factors. The glass transition temperature (T_g) of polynorbornene (PNB) is around room temperature, which is in favor of reversible deformation. Therefore, in this study, PNB materials with low oil filling were prepared by using PNB as the matrix and adding environmentally friendly aromatic oils with different contents. The effects of plasticizing oil content, deformation temperature and relaxation time on the reversible plasticity shape memory properties of PNB materials were studied by differential scanning calorimeter (DSC), universal electronic tensile testing machine and dynamic mechanical analysis (DMA). The results show that the plasticizing oil can continuously adjust the T_g of the PNB materials to keep it near room temperature, which is beneficial to the reversible plasticity deformation and excellent mechanical properties. When the deformation temperature is lower than the glass transition initiation temperature 2 °C, the energy consumption for material deformation is lower, and the molecular chain motion activation energy is higher, so the movement of chain segments is limited when the applied force is removed, thus, the fixation ratio is higher. The deformation temperature has little effect on the material recovery ratio. Because of the ultra-high molecular weight of PNB, when the triggering temperature is much higher than its transition temperature (T_g + 50 °C), the molecular chain entropy increases, resulting in a large entropy elastic recovery force, so the recovery ratios of all the deformed samples at different temperatures are higher than 95.0%. It is concluded that PNB has an excellent reversible plasticity shape memory performance when the deforming temperature is 2 °C lower that its onset of glass transition temperature. In addition, prolonging the relaxation time can also increase the shape fixed ratio, but the degree is limited.
- Polynorbornene,
- Plasticizing oil,
- Reversible plasticity,
- Shape memory,
- Deformation time,
- Relaxation time
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