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

Mao-lin Zhang; Xing-xing Ji; Xin-yan Shi

doi:10.11777/j.issn1000-3304.2019.19050

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

Research Article | 更新时间：2021-01-26

- Study on the Key Factors of Reversible Plasticity Shape Memory of Polynorbornene
- Acta Polymerica Sinica Vol. 50, Issue 9, Pages: 949-956(2019)
- 作者机构：
  
  青岛科技大学高分子科学与工程学院橡塑材料与工程教育部重点实验室　青岛 266042
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2019.19050
  CLC：
- Published：2019-9，
  
  Published Online：17 May 2019，
  
  Received：13 March 2019，
  
  Revised：8 April 2019，
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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 50(9):949-956(2019)
DOI：

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 50(9):949-956(2019) DOI： 10.11777/j.issn1000-3304.2019.19050.

摘要

以聚降冰片烯(PNB)为基体，添加不同份数的环保芳烃油制备低充油PNB材料，通过示差扫描量热法(DSC)、万能电子拉伸试验机、动态力学分析(DMA)等研究了不同增塑油含量、变形温度、松弛时间等因素对PNB材料可逆塑性形状记忆性能的影响. 结果表明，增塑油可连续调节PNB的

并使其维持在室温附近，有利于室温下可逆塑性形变；当变形温度低于材料玻璃化转变起始温度2 °C时，这时材料变形耗能最低、分子链运动活化能较高，撤除外力后分子链运动受限制，因此固定率较高；而变形温度对材料恢复率影响较小，由于PNB具有超高分子量，当驱动温度远高于其玻璃化转变温度时，分子链熵值增大，产生较大的熵弹恢复力，因此恢复率均高于95.0%，材料具有优异的可逆塑性形状记忆性能；另外，延长松弛时间也可在一定程度上提高材料的形状固定率.

Abstract

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 (

) 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

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 (

+ 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.

关键词

聚降冰片烯环保芳烃油可逆塑性形状记忆变形温度松弛时间

Keywords

PolynorbornenePlasticizing oilReversible plasticityShape memoryDeformation timeRelaxation time

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Related Institution

Key Laboratory of Rubber and Plastic Materials and Engineering, Ministry of Education, Qingdao University of Science & Technology

College of Chemistry and Materials Science, Sichuan Normal University

Department of Chemistry, Tsinghua University

School of Materials Science and Engineering, University of Science and Technology Beijing

State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low-dimension Materials, College of Material Science and Engineering, Donghua University

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