Abstract
Mechanism of surface alignment of liquid crystals (LCs) on the films formed by coating with concentrated solutions of hydroxypropylcellulose (HPC) is studied using a model coating flow. The numerical simulations for the model coating flow are carried out using the Doi model for concentrated solutions of rod-like polymers. The development of molecular orientation on the free surface is revealed in the simulation. Furthermore, parallel surface alignment is obtained under the conditions of high coating speed and thin coating thickness in the experiment of the coating film. The experimental results are discussed in connection with the simulation ones.
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