Free-standing, polysilsesquioxane-based inorganic/organic hybrid membranes for gas separations

Side-chain engineering of ladder-structured polysilsesquioxane membranes for gas separations

“…1 (a)) [32]. Our previous work demonstrated that the octaaminophenyl POSS (OAPS)-involved thermal crosslinking of LPG64 substantially reduced its permeability mainly due to the decreasing inter-chain distance [16]. As seen in Fig.…”

“…Single gas permeation test was conducted for He, H 2 , CO 2 , O 2 , N 2 , and CH 4 using constant volume-variable pressure system [26]. The detailed permeation measurements are described in our previous work [16,17]. The apparent diffusivity was obtained from the time-lag method [27] and the apparent solubility was calculated by dividing permeability by the corresponding diffusivity.…”

“…The separation factor (α*) of the feed mixture (CO 2 /N 2 ) can be calculated using the following equation, The synthesis of LPSQs with various alkyl groups as well as copolymer ratios were carried out by following a modified literature procedure [14][15][16]. In this method, a high [28,29], as well as the various epoxy (908 cm -1 ), carbonyl (1748 cm -1 ), vinyl (1648 cm -1 ), and phenyl (1600 cm -1 ) groups (See Fig.…”

“…They possess structural peculiarities in which the Si-O-Si bonds consist of double stranded ladder-like structure, with the organic functional groups radially stemming outwards [13][14][15]. Very recently, we investigated the first-ever free-standing LPSQ membrane as a proof of concept for gas separation [16]. Also, a rational molecular design of engineering PEOfunctionalized side-chain groups was successfully achieved for exceptionally high CO 2 separation performance [17], with an in-depth processing study of the practical applications of LPSQ membranes.…”

Architecture of Silsesquioxanes

“…This method has been further used for preparing polyphenylsilsesquioxanes (Lee et al 2012;Kolezynski et al 2013), poly(phenyl-co-mercaptopropyl)silsesquioxane (Lee et al 2013), poly(methacryloxypropyl)silsesquioxane (Lee et al 2014a), and poly(phenyl-co-glycidyloxypropyl)silsesquioxanes (Lee et al 2014b;Kang et al 2015). A series of thiol-ene UV-curable thermoplastic poly(phenyl-comethacryloxypropyl)silsesquioxanes and their blends with poly(phenyl-comercaptopropyl)silsesquioxanes were recently proposed as inorganic-organic hybrid photocurable hard coating formulations .…”