Citation: Guan-cong Chen, Zi-zheng Fang, Yu-kun Hou, Zhang-fa Tong, Qian Zhao. Shape Memory Polymers with Regionally Defined Glass Transition Temperature via Digital Photocuring[J]. Acta Polymerica Sinica, ;2019, 50(3): 311-318. doi: 10.11777/j.issn1000-3304.2019.18229 shu

Shape Memory Polymers with Regionally Defined Glass Transition Temperature via Digital Photocuring

1.
College of Chemistry and Chemcal Engineering, Guangxi Univerisity, Nanning 530004
2.
State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027

Corresponding author: Qian Zhao, qianzhao@zju.edu.cn
Received Date: 2 November 2018
Revised Date: 28 November 2018
Available Online: 27 December 2018

Thermal transition temperatures (e.g. glass transition temperatures) play an important role in various applications of shape memory polymers that can recover from temporary shapes to original (permanent) shapes upon heating. This study reports a shape memory epoxy with unsaturated double bonds, enabling a secondary photocuring process. Dual-functional epoxy monomer, E44, and monofunctional epoxy monomer, glycidyl methacrylate, are first thermally cured via a polyether amine crosslinker. Properties of the cured epoxy can be finely tuned by controlling the feed compositions. The increase of feed ratio of glycidyl methacrylate will lead to lower glass transition temperature and elastic modulus, whereas larger strain at break. In the secondary photocuring process, the unsaturated bonds provided by glycidyl methacrylate are polymerized after light exposure, forming additional crosslinking points. As a result, the glass transition temperature of the material increases. Herein, digital photo-masking technique is applied for the photocuring process via a commercial projector. The regional exposure time of the material can be conducted, and thus, the local glass transition temperature can be controlled in a range of approximately 40 − 70 °C. Storage modulus at the rubbery state of the material increases from approximately 0.5 MPa to 8 MPa after photo exposure for 240 s, implying that there is a remarkable increase of the crosslinking density via the secondary photocuring. Both the materials before and after the secondary photocuring provide ideal shape memory performance. The shape fixity ratios and shape recovery ratios retain nearly 100% during six shape memory cycles, indicating good thermo-mechanical stability of the material. The material with regional controllable glass transition temperature enables a programmable multi-shape recovery process. Complex original shapes can be fabricated if the secondary photocuring is conducted towards a thermally cured epoxy. In addition, the material can be potentially applied as a novel substrate for stretchable electronics due to its strain isolation functionality.
- Shape memory polymers,
- Glass transition temperature,
- Epoxy resin,
- Photocuring
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Shape Memory Polymers with Regionally Defined Glass Transition Temperature via Digital Photocuring

南开大学师唯/华北电力大学（保定）刘景维：二维配位聚合物中有序的亲锂冠醚位点用于无枝晶锂沉积

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通讯作者: 陈斌, bchen63@163.com