, Volume 26, Issue 1, pp 399–412 | Cite as

Thermotropic liquid crystalline properties of (hydroxypropyl)cellulose derivatives with butyryl and heptafluorobutyryl substituents

  • Hirokazu Ishii
  • Kazuki SugimuraEmail author
  • Yoshiyuki Nishio
Original Paper


(Hydroxypropyl)cellulose (HPC) derivatives with butyryl (Bu) and heptafluorobutyryl (7FBu) substituents were prepared in various proportions of the Bu/7FBu groups and at a fixed total DS (DSBu + DS7FBu) of 3.0. Thermotropic liquid crystallinity of the derivatives (Bu7FBu-HPC) was investigated to specify the effect of the fluoroacylation on the mesophase behavior. Thermal transition data were collected using differential scanning calorimetry and polarized light microscopy. The Bu7FBu-HPC samples formed a chiral nematic phase between their glass transition and isotropization temperatures, Tg and Ti-a, respectively; these transition temperatures rose moderately as the 7FBu proportion increased (Tg = − 44 to  − 27 °C and Ti-a = 158–190 °C for DS7FBu = 0.04–1.60). The structural property of the mesophase was examined at 70 °C by circular dichroism and other optical measurements. The chiral nematic pitch (P) sensitively increased with increasing 7FBu proportion, while the supramolecular helical arrangement remained right-handed. Selective light-reflection colors were observed for the samples of DS7FBu = 0.04–0.8, covering an entire spectrum range from violet to red. Temperature dependence of P was also examined for selected samples below Ti-a, and it was found to increase with increasing temperature; however, there was no indication of inversion in the handedness of the helical structure. Wide-angle X-ray diffractometry revealed that the increases of P responding to the increases in DS7FBu and temperature were attributable to the decrease of the twist angle between adjacent thin nematic layers.

Graphical abstract


(Hydroxypropyl)cellulose (HPC) HPC ester Fluoroacylation Thermotropic liquid crystal Chiral nematic structure 



This work was financed by Grant-in-Aids (KAKENHI) for Scientific Research (A) (No. 26252025 to YN) and Young Scientist Research (B) (No. 17K15295 to KS) from the Japan Society for the Promotion of Science (JSPS).

Compliance with ethical standards

Conflict of interest

The authors declare no conflict of interest.

Supplementary material

10570_2018_2176_MOESM1_ESM.docx (347 kb)
Supplementary material 1 (DOCX 348 kb)


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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.Division of Forest and Biomaterials Science, Graduate School of AgricultureKyoto UniversityKyotoJapan

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