TY - JOUR ID - 51448 TI - Improvement of gas separation properties of polyurethane membrane using plasma grafting JO - Iranian Journal of Chemical Engineering(IJChE) JA - IJCHE LA - en SN - 1735-5397 AU - Azadi, P. AU - Hassanajili, Sh. AD - SSchool of Chemical and Petroleum Engineering, Shiraz University, P. O. Box: 71348-51154, Shiraz, Iran AD - School of Chemical and Petroleum Engineering, Shiraz University, P. O. Box: 71348-51154, Shiraz, Iran Y1 - 2017 PY - 2017 VL - 14 IS - 3 SP - 19 EP - 30 KW - Surface modification KW - Plasma applications KW - Grafting KW - Selective permeation KW - Polyurethane DO - N2 - In recent years, plasma treatments have given good results since they offer high technological efficiency with low waste generation. One of the most important characteristics of plasma methods is their action only on a thin surface layer, whereas the bulk of sample remains unchanged and the modified material keeps its chemical and mechanical properties. In this research, polyurethane membrane surface was modified by low frequency plasma grafting with methacrylic acid and acrylamide monomers to alter solution-diffusion mechanism. We chose different parameters of plasma treatment and studied their effects toward maximum solubility, permeation and selectivity. The grafting on the surfaces was characterized by water contact angle measurement and atomic force microscopy. After confirming a successful grafting, we studied the effect of surface modification on permeation of CH4 and CO2. Significant increase in CO2 permeation and about 32 percent increase in CO2/CH4 selectivity was observed. Better results were obtained for low powers and acrylamide grafted surface. UR - https://www.ijche.com/article_51448.html L1 - https://www.ijche.com/article_51448_0a8e0b0a2b3e324690b8aab24d9fd67e.pdf ER -