Liang Guodong, Wu Jialong, Gao Haiyang, Wu Qing, Lu Jiang, Zhu Fangming, Tang Ben Zhong
DSAP, PCFM and GDHPPC Lab, School of Materials Science and Engineering, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, China.
Department of Chemistry, Institute for Advanced Study, Division of Biomedical Engineering, State Key Laboratory of Molecular, Neuroscience and Institute of Molecular Functional Materials, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
ACS Macro Lett. 2016 Aug 16;5(8):909-914. doi: 10.1021/acsmacrolett.6b00453. Epub 2016 Jul 15.
Memory polymers capable of remembering their shape or thermal history have attracted increasing interest due to their potential applications in smart and medical devices. Memory polymers established are mechanically based, which suffer from some inherent limitations such as low sensitivity and bulky size. Here, we develop a general platform for sensitive memory polymers. Incorporating crystallizable polymers with solid-state fluorescent dyes results in crystallizable fluorescent polymers. Such polymers show remarkably temperature-dependent fluorescence emission. Interestingly, fluorescence of the polymers shows a hysteresis between heating and subsequent cooling scans, which offers them a valuable thermally stimulated recording function. Both off-on and on-off recording functions can be achieved. Characters recorded on the polymer films can be erased and rewritten. Moreover, thermal history subjected to the polymers can be memorized and retrieved by measuring fluorescence intensity. With the merit of easy synthesis, recording function, remarkably thermoresponsive fluorescence with memory function, superior flexibility, and biocompatibility inherited from polymers, crystallizable fluorescent polymers offer a general platform for memory fluorescent polymers that are potentially useful for biosensing, recording materials, and smart devices.
能够记住其形状或热历史的记忆聚合物因其在智能和医疗设备中的潜在应用而受到越来越多的关注。已建立的记忆聚合物基于机械原理，存在一些固有局限性，如灵敏度低和尺寸庞大。在此，我们开发了一个用于灵敏记忆聚合物的通用平台。将可结晶聚合物与固态荧光染料结合可得到可结晶荧光聚合物。这类聚合物表现出显著的温度依赖性荧光发射。有趣的是，聚合物的荧光在加热和随后的冷却扫描之间呈现滞后现象，这赋予它们宝贵的热刺激记录功能。开-关和关-开记录功能均可实现。记录在聚合物薄膜上的字符可以擦除和重写。此外，通过测量荧光强度可以存储和检索施加于聚合物的热历史。可结晶荧光聚合物具有易于合成、记录功能、具有记忆功能的显著热响应荧光、优异的柔韧性以及从聚合物继承的生物相容性等优点，为记忆荧光聚合物提供了一个通用平台，有望用于生物传感、记录材料和智能设备。
