Facile design of pressure-sensing color films of liquid crystalline cellulosic/synthetic polymer composites that function at desired temperatures
Facile design of pressure-sensing color films of liquid crystalline cellulosic/synthetic polymer composites that function at desired temperatures
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DOI：
10.1007/s10570-019-02769-3
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发表时间：
2019-12-01
期刊：
影响因子：
5.7
通讯作者：
Teramoto, Yoshikuni
中科院分区：
文献类型：
--
作者：
Miyagi, Kazuma;Teramoto, Yoshikuni
我们已经开发了一种简便的方法，用于压力传感膜的材料设计，用于各种工作温度下使用的液晶（ChLC）纤维素衍生物。制备了一系列不同乙酰化度（DSAc）的乙酰化羟丙基纤维素（AHPCs），其在单体溶剂中的浓溶液基于ChLC的选择性反射显示颜色。AHPC/单体溶液的临界显色浓度随着DSAc的增加而降低，这是因为引入乙酰基增加了α-螺旋的扭曲角。随后使ChLC溶液经受原位聚合以在所产生的复合材料中形成ChLC结构。ChLC结构很好地固定在复合材料中，组分聚合物之间具有适度的相容性。所得到的AHPC/聚合物ChLC复合材料表现出压缩诱导的机械致色性，和一致的压力灵敏度在不同的温度下通过选择的计数器聚合物物种。该方法适用于设计适合于工作温度的压力传感膜。[图形]。
We have developed a facile method for material design of pressure-sensing films for various operating temperatures using cholesteric liquid crystalline (ChLC) cellulose derivatives. A series of acetylated hydroxypropyl celluloses (AHPCs) with different degrees of acetylation (DSAc) was prepared and their concentrated solutions in monomeric solvents showed coloration based on the selective reflection of ChLC. The critical coloration concentration of the AHPC/monomer solutions decreased with increasing DSAc because the twist angle of the cholesteric helix increased by introducing acetyl groups. The ChLC solutions were subsequently subjected to in situ polymerization to immobilize the ChLC structure in the produced composites. The ChLC structure was well immobilized in the composites with moderate compatibility between the component polymers. The obtained AHPC/polymer ChLC composites exhibited compression-induced mechanochromism, and consistent pressure sensitivity was achieved at various temperatures by selection of the counter polymer species. This approach is applicable for designing pressure-sensing films tailored to the operating temperature.[GRAPHICS].