Band textures in the presheared hydroxypropylcellulose film and corresponding evolution process

来源 :Progress in Natural Science | 被引量 : 0次 | 上传用户:christopherq
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The band textures in the presheared hydroxypropylcellulose (HPC) aqueous solution, a typical ly-otropic polymeric liquid crystal, are studied experimentally, and the corresponding real-time evolution is detected with time-resolved polarized optical microscopy (POM) and small-angle laser scattering (SALS) . The maximum divergence angle of the local director relative to the preshearing direction increases with time. A novel morphology, the bamboo-like band texture is found after cessation of shear flow. The bands are wavy in the intermediate stage of the relaxation process The transition from a highly-oriented mono-domain to multiple domains is revealed from both POM and SALS observations The evolution process of the presheared HPC solution is roughly divided into three stages. The band textures in the presheared hydroxypropylcellulose (HPC) aqueous solution, a typical ly -otropic polymeric liquid crystal, are studied experimentally, and the corresponding real-time evolution is detected with time-resolved polarized optical microscopy (POM) and small-angle laser A maximum morphology, the bamboo-like band texture is found after cessation of shear flow. The bands are wavy in the intermediate stage of the relaxation process The transition from a highly-oriented mono-domain to multiple domains is revealed from both POM and SALS observations The evolution process of the presheared HPC solution is roughly divided into three stages.
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