Fixation of Chiral Smectic Liquid Crystal (S)-(+)-4-(2-methyl- 1-butyloyloxy)phenyl 4-[1-(propenoyloxy) butiloxy] benzoate Using UV curing techniques Afrizal 1* , Muhammad Hikam 2 , Bambang Soegiyono 2 , Asep Riswoko 3 , Nurdelima 1 , Umeir 1 1 Faculty of Mathemathics and Natural Science, University Of State Jakarta, Jakarta, Indonesia 2 Department of Materials Science, University Of Indonesia, Depok 3 Center for Material Technology, BPPT, Jl. MH.Thamrin 8 Jakarta,Indonesia Email : rizalunj04@yahoo.com Abstract. Chiral Smectic Liquid Crystal (S)-(+)-4-(2-methyl-1-butyloyloxy)phenyl 4-[1-(propenoyloxy) butiloxy] benzoate has been synthesized using method of steglich esterification at room temperature. The mesomorphic behavior of chiral smectic at 55 o C that showed schlieren texture in POM analysis. Fixation of structure chiral smectic liquid crystal by means of photopolymerization of monomer (S)-(+)-4-(2-methyl-1-butyloyloxy)phenyl 4-[1-(propenoyloxy) butiloxy] benzoate under UV irradiation which called UV curing techniques. The curing process using UV 3 lamps 100 volt at 60 0 C for an hour. The product of photopolymerization could be seen by analysis of FTIR spectra both monomer and polymer. FTIR spectra of monomer, two peaks for ester carbonyl and C-C double bond groups appeared at 1729.09 cm -1 and 3123.46 cm -1 . After UV curing process, peak for the carbonyl group at 1729.09 cm -1 decreased and a new peak at 1160.21 cm -1 appeared due to the carbonyl group attached to a C-C bond group and then peak at 3123.46 cm -1 for C-C double bond group was disappeared. Keywords: FixationChiral Smectic Polyacrylat, photopolymerization, UV curing. PACS: 61.30.Vx INTRODUCTION Liquid crystals have anisotropic properties between solid and liquid. That similar to solid crystals because of the ordered way in which some of the constituent molecules are arranged. However similar to liquid, liquid crystals have low viscosity and can flow. The liquid crystals are a stable phase of matter called the mesophase. The liquid crystal has been applied especially in the display industry, such as in portable TVs and notebook and desktop computers [1,2]. Molecular chirality has a particularly remarkable influence of the physical properties of the liquid crystalline systems. In general, the basic structure of liquid crystal molecule are spacer group and mesogen group. The majority of opticalapplications of thermotropic LCs is due to chiral structures. According to merlo (2001) thin film of liquid crystal polyacrylate with chiral side chain were very thin and can be applied inside the cell (in- cell), facilitating the development of flexible displays [3,4,5]. Monomer of chiral smectic (S)-(+)-4-(2- methyl-1-butyloyloxy)phenyl 4-[1-(propenoyloxy) butiloxy] benzoate that abbreviatedwith MCS is the liquid crystallinepolyacrylates from (S)-(-)-2-methyl- 1-butanoic. In general liquid crystalline polyacrylats as ferroelectric liquid crystalline. For applications usually monomer acrylate has to be polymer. One of the