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Kajiyama, Tisato,Kikuchi, Hirotsugu,Jeong, Hwan Kyeong,Jeong, Noh Hee,Nam, Ki Dae 한국공업화학회 1998 Journal of Industrial and Engineering Chemistry Vol.4 No.3
The relationship between the polymer molecular weight and the electro-optical properties was investigated for the polymer/liquid crystal (LC) composite film prepared by a solvent-induced phase separation method. Poly(methyl methacrylate) (PMMA) and poly(diisopropyl fumarate) (Pdi-iPF) with significantly different weight-average molecular weight (M_w) were used as the matrix for the Polymer/LC composite film. It is confirmed from morphological observation by scanning electron microscope (SEM) that the size of LC channel or domain was strongly dependent on M_w of PMMA and Pdi-ipF. With increasing M_w in PMMA/LC composite film, the switching hysteresis was decreased due to a decrease of the compatibility at the polymer-LC interface. The hysteresis in (Pdi-iPF/LC) composite film was not detected for electro-optical switching and this result is not changed with MW of Pdi-iPF.