期刊
MATERIALS
卷 9, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/ma9090792
关键词
shape memory; liquid crystalline; self-healing
类别
资金
- National Natural Science Foundation of China [61425007, 61377090, 61575128]
- Natural Science Foundation of Guangdong [2014A030313559, 2016A030313050]
- Special Research Foundation of Shenzhen Overseas High-level Talents for Innovation and Entrepreneurship [KQCX20120807153115869]
- Nanshan District Key Lab for Biopolymers and Safety Evaluation [KC2014ZDZJ0001A]
- Science and Technology Project of Shenzhen City [JCYJ20140828163633993, ZDSYS201507141105130, CYZZ20150827160341635]
- Shenzhen Key Laboratory of Special Functional Materials [T201501]
To better understand shape memory materials and self-healing materials, a new series of liquid-crystalline shape memory polyurethane (LC-SMPU) composites, named SMPU-OOBAm, were successfully prepared by incorporating 4-octyldecyloxybenzoic acid (OOBA) into the PEG-based SMPU. The effect of OOBA on the structure, morphology, and properties of the material has been carefully investigated. The results demonstrate that SMPU-OOBAm has liquid crystalline properties, triple-shape memory properties, and self-healing properties. The incorporated OOBA promotes the crystallizability of both soft and hard segments of SMPU, and the crystallization rate of the hard segment of SMPU decreases when the OOBA-content increases. Additionally, the SMPU-OOBAm forms a two-phase separated structure (SMPU phase and OOBA phase), and it shows two-step modulus changes upon heating. Therefore, the SMPU-OOBAm exhibits triple-shape memory behavior, and the shape recovery ratio decreases with an increase in the OOBA content. Finally, SMPU-OOBAm exhibits self-healing properties. The new mechanism can be ascribed to the heating-induced bleeding of OOBA in the liquid crystalline state and the subsequent re-crystallization upon cooling. This successful combination of liquid crystalline properties, triple-shape memory properties, and self-healing properties make the SMPU-OOBAm composites ideal for many promising applications in smart optical devices, smart electronic devices, and smart sensors.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据