Abstract
The morphology and drawability of hydroxypropyl cellulose (HPC) films cast from water, N,N-dimethyl formamide, and acetic acid solutions were investigated in terms of the molecular weight and characteristics of the HPC chains in solution. Liquid crystals showing cholesteric color were observed in water and acetic acid solutions with appropriate concentrations, where the weight average degree of polymerization (barD̅P̅w), is less than 370. Interestingly, the color was maintained within films cast from acetic acid. In constant, the color could not be observed for HPC chains with D̅P̅>1750. These phenomena were investigated by elastic and inelastic light scattering, polarized small-angle light scattering and optical microscopy. Interestingly, the HPC chains of D̅P̅<370 were found to be stiffest in acetic acid. The characteristics of the HPC chains in solvent also significantly effected on the drawability of resultant cast films. That is, the drawability of the film was sensitive to the molecular weight of the HPC and the type of solvent. The light scattering measurements showed that the drawability becomes more pronounced as the HPC chain expansion in solvent increases.
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Yanagida, N., Takematsu, S. & Matsuo, M. Relationship between the Morphology and Mechanical Properties of Hydroxypropyl Cellulose Films and the Characteristic Behavior of the Chains in Solution. Polym J 26, 1–12 (1994). https://doi.org/10.1295/polymj.26.1
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DOI: https://doi.org/10.1295/polymj.26.1