By modification of ester cellulosic materials, the manufactured films can be expected to absorb or reflect a specified light, which those films can be applied for certain needs such as green house, UV block film, so on. In this study, several materials based of ester celluloses have been synthesized and modified to be films or membranes. Properties of the light absorbance and transmission ofthose films in several light areas (190-380 nm, 380-780 nm, and 780-1100 nm) have then be analyzed systematically. The ester celluloses those synthesized by acid chloride methode have been obtained as powder, which are then poured into methylene chloride, stirred and evaporated to form fulldense films. The films formed from acetate cellulose, benzoate cellulose, and palmitate cellulose have following absorption percentation of light, especially, in ultraviolet region (190-380 nm) 16,5%, 38,7% and 48,9%, respectively. By the facts, it is known that the light absorptions of the films are depended on their chemical structure. Therefore, in our study now, we respect to study about the relationship between the light absorption/transmission and their chemical structures. Key words: Cellulose of palmi tat, cellulose ofbenzoat, cellulose oftriasetat, light transmission. Asep Riswoko Pusat Pengkajian dan Penerapan Teknologi Material (P3TM) - BPPT
