• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2021, Vol. 57 ›› Issue (7): 234-243.doi: 10.3901/JME.2021.07.234

• 制造工艺与装备 • 上一篇    下一篇

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4D打印液晶弹性体工艺及其性能研究

汤桂平1, 刘庆萍2, 宋波1, 史玉升1   

  1. 1. 华中科技大学材料科学与工程学院 武汉 430074;
    2. 吉林大学工程仿生教育部重点实验室 长春 130022
  • 收稿日期:2020-04-01 修回日期:2020-11-03 出版日期:2021-04-05 发布日期:2021-05-25
  • 通讯作者: 宋波(通信作者),男,博士,教授,博士研究生导师。主要研究方向3D/4D打印技术,材料与结构设计。E-mail:bosong@hust.edu.cn
  • 作者简介:汤桂平,男,1991年出生。主要研究方向4D打印。E-mail:m201770907@hust.edu.cn
  • 基金资助:
    华中科技大学学术前沿青年团队资助项目(2018QYTD04)。

Study on 4D Printing of Liquid Crystal Elastomers Process and Properties

TANG Guiping1, LIU Qingping2, SONG Bo1, SHI Yusheng1   

  1. 1. State Key Laboratory of Materials Processing and Die& Mould Technology, Huazhong University of Science and Technology, Wuhan 430074;
    2. Key Laboratory of Bionic Engineering (Ministry of Education), Jilin University, Changchun 130022
  • Received:2020-04-01 Revised:2020-11-03 Online:2021-04-05 Published:2021-05-25

摘要: 液晶弹性体(Liquid crystal elastomers,LCEs)因其大且可逆的变形、响应速率快、优异的力学性能、各向异性以及驱动条件简单灵活等特点,在智能构件制造领域被认为具有广泛的应用潜力。为了提升液晶弹性体的成形能力,丰富液晶弹性体的变形模式及其设计方法,提出了利用墨水直写打印工艺编程液晶弹性体复杂变形模式的方法。制备了最大变形率达51%的主链型液晶弹性体,研制适合打印工艺编程的气压挤出高温墨水直写打印设备,探索了墨水直写打印工艺对液晶弹性体性能的影响规律。发现打印速率对液晶弹性体的变形率具有显著影响,随着打印速率的增大,变形率从12%逐渐增大到最大变形率51.8%后不再变化。此外,打印温度可使液晶弹性体的变形率在38.3%~51%之间变化,紫外光照时间可使凝胶分数最高到62.2%,而打印与紫外光照的间隔时间对材料的变形率没有影响。最后通过打印速率编程液晶弹性体弯曲行为,实现了液晶弹性体变形模式和行为的精确控制,证明了墨水直写打印工艺编程液晶弹性体复杂变形模式方法的可行性。

关键词: 液晶弹性体, 墨水直写打印, 工艺编程, 打印速率, 弯曲变形

Abstract: Liquid crystal elastomers (LCEs) are considered to have great potential in intelligent component manufacturing due to its large and reversible deformation, fast response, excellent mechanical properties, anisotropy and flexible driving conditions. In order to promote the forming ability of the liquid crystal elastomers and enrich the deformation mode of the liquid crystal elastomers and its design method, a method of programming the complicated deformation mode of the liquid crystal elastomers by the printing process of direct ink writing is proposed. A main-chain liquid crystal elastomer with a maximum deformation rate of 51% is prepared, and a pressure-extruded high-temperature direct ink writing equipment suitable for printing process programming is developed. The influence of the direct ink writing process on the performance of the liquid crystal elastomers is explored. It was found that the print speed had a significant effect on the deformation rate of the liquid crystal elastomers. With the increase of the print speed, the deformation rate gradually increased from 12% to the maximum deformation rate of 51.8% and then no longer changed. Additionally, the deformation rate of the liquid crystal elastomers varies between 38.3% and 51% under the control of print temperature, and the UV radiation time can increase gel fraction of the liquid crystal elastomers up to 62.2%. But the interval between printing and UV radiation has no effect on the deformation rate. Finally, the bending behavior of the liquid crystal elastomer was programmed by print speed to achieve precise control of the deformation mode and behavior of the liquid crystal elastomer, which proved the feasibility of the method of programming the complex deformation mode of the liquid crystal elastomers by the direct ink writing printing process.

Key words: liquid crystal elastomers, direct ink writing, process programming, print speed, bending deformation

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