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- W2078113786 abstract "Abstract To study structure–mesomorphism relationships of the monomers and polymers based on menthol, four new chiral monomers ( M 1 – M 4 ) and the corresponding homopolymers ( P 1 – P 4 ) with menthyl group were synthesized. Their chemical structures, formula, phase behavior, and thermal stability were characterized by FTIR, 1 H NMR, 13 C NMR, elemental analyses, differential scanning calorimetry, polarizing optical microscopy, X‐ray diffraction, and thermogravimetric analysis. The selective reflection of light was investigated with ultraviolet/visible spectrometer. The influence of the mesogenic core rigidity, spacer length, and menthyl steric effect on the mesomorphism of M 1 – M 4 and P 1 – P 4 was examined. By inserting a flexible spacer between the mesogenic core and the terminal menthyl groups, four target monomers and polymers could form the expected mesophase. Moreover, their melting temperature ( T m ), glass transition temperature ( T g ), clearing temperature ( T i ), and mesophase range (Δ T ) increased with increasing the mesogenic core rigidity; whereas the T m and T g decreased, T i and Δ T increased with an increase of the spacer length. M 1 and M 2 showed monotropic and enantiotropic cholesteric phase, respectively, whereas M 3 and M 4 all revealed chiral smectic C (SmC*), cholesteric and cubic blue phases. In addition, with increasing temperature, the selective reflection of light shifted to the long wavelength region at the SmC* phase range and to the short wavelength region at the cholesteric range, respectively. P 1 and P 2 only showed a smectic A (SmA) phase, whereas P 3 and P 4 exhibited the SmC* and SmA phases. All the obtained polymers had very good thermal stability. © 2012 Wiley Periodicals, Inc. J. Polym. Sci. Part A: Polym Chem, 2012" @default.
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- W2078113786 date "2012-09-14" @default.
- W2078113786 modified "2023-10-18" @default.
- W2078113786 title "Synthesis, structure, and properties of chiral liquid crystal monomers and polymers based on menthol" @default.
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- W2078113786 doi "https://doi.org/10.1002/pola.26350" @default.
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