Journal
ACS MACRO LETTERS
Volume 9, Issue 9, Pages 1325-1331Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsmacrolett.0c00571
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Funding
- National Key R&D Program of China [2016YFC1100801]
- National Natural Science Foundation of China [21674095]
- State Key Laboratory of Chemical Engineering [SKLChE-16Z]
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Stress-free two-way shape memory polymers (2W-SMPs) capable of reversible shifting between two distinct shapes are versatile platforms for the development of future smart devices. However, it is challenging to prepare stress-free 2W-SMPs with good actuation performance and shape programmability from single-component semicrystalline polymers. Herein, we demonstrate a straightforward and universal strategy for preparing 2W-SMPs through self-nucleated crystallization (SNC) of semicrystalline polymers. SNC enables the formation of two types of crystals in the 2W-SMPs, annealed and primary crystals, which function as the skeleton phase and actuation phase, respectively. We achieved a high reversible actuation strain of 17.6% and a good reprogrammability of the SNC-treated polymer networks. Complex shape transformations were obtained, and smart devices were fabricated from the SNC-treated networks by using a locally designed folding and kirigami structure. The SNC strategy provides a generalized approach to improve the 2W-shape memory behavior of semicrystalline polymers.
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