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The effect of liquid crystal fillers on structure and properties of liquid crystalline shape memory polyurethane composites II: 4-hexadecyloxybenzoic acid

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Abstract

In order to better understand the interrelation between liquid crystal fillers and functional polymers, a series of liquid crystalline shape memory polyurethane composites (LC-SMPUCs), named shape memory polyurethane (SMPU)–4-hexadecyloxybenzoic acid (HOBA) composites, are prepared by incorporating HOBA into SMPU based on a polyethylene glycol (PEG) soft segment. The results demonstrate that the dimerization structure of HOBA is maintained in the as-prepared SMPU–HOBA composites, facilitating liquid crystalline properties. Characterization results display smectic C phase upon heating, while the isotropic temperature shifts to a higher temperature, broadening the temperature range of the liquid crystalline phase. The SMPU–HOBA composites form a two-phase separated structure containing a SMPU phase and a HOBA phase; the incorporated HOBA can promote crystallizability of both soft and hard segments of SMPU, while crystalline hard phases are maintained within the high temperature range. Thus, SMPU–HOBA composites demonstrate a two-step modulus change upon heating that releases a triple-shape memory effect. The final shape fixing ratio is higher than 99%, and the final shape recovery ratio reaches 90%. Therefore, the SMPU–HOBA composites successfully provide a desirable combination of liquid crystalline properties and triple-shape memory properties, making them ideal candidates for smart sensor, smart labels, etc.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 61425007, 61377090, and 61575128), the Natural Science Foundation of Guangdong (Grant Nos. 2014A030313559, 2016A030313050), the Special Research Foundation of Shenzhen Overseas High-level Talents for Innovation and Entrepreneurship (Grant No. KQCX20120807153115869), the Nanshan District Key Lab for Biopolymers and Safety Evaluation (No. KC2014ZDZJ0001A), the Science and Technology Project of Shenzhen City (Grant Nos. JCYJ20140828163633993, ZDSYS201507141105130, CYZZ20150827160341635).

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Authors and Affiliations

  1. Guangdong Research Center for Interfacial Engineering of Functional Materials, Shenzhen Key Laboratory of Polymer Science and Technology, Nanshan District Key Lab for Biopolymers and Safety Evaluation, College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518060, China

    Jianfeng Ban, Linjiang Zhu & Shaojun Chen

  2. Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China

    Jianfeng Ban & Yiping Wang

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  1. Jianfeng Ban
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  2. Linjiang Zhu
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Correspondence to Shaojun Chen or Yiping Wang.

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Ban, J., Zhu, L., Chen, S. et al. The effect of liquid crystal fillers on structure and properties of liquid crystalline shape memory polyurethane composites II: 4-hexadecyloxybenzoic acid. J Mater Sci 52, 2628–2641 (2017). https://doi.org/10.1007/s10853-016-0554-8

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  • DOI: https://doi.org/10.1007/s10853-016-0554-8

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