Abstract
Abstract Phase behavior in binary and ternary mixtures of ethyl cellulose (EC), hydroxypropyl cellulose (HPC), and acrylic acid (AA) was investigated by optical techniques including polarized-light microscopy (POM), refractometry, UV absorption, and circular dichroism (CD) spectrophotometries, and laser-light scattering. Both derivatives of cellulose formed a cholesteric liquid-crystal phase in concentrated solutions in AA. EC and HPC homopolymer solutions in AA showed iridescent colors in the concentration range of 42–50 wt% and 65–80 wt%, respectively. In the 30–50 wt% HPC/AA solutions, an optical image with fingerprint-like patterns was observed between crossed polars. CD revealed that the cholesteric helical sense was right-handed in the HPC/AA mesophase, while the EC/AA mesophase formed left-handed structures. Anisotropic samples of HPC/AA and EC/AA also showed a POM image with a grid-like texture, which was much coarser in the former system compared with that in the latter. A phase diagram construct...
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