Effect of OH group on the water vapor sorption property of adamantane-containing polymer membranes

Thermal and gas permeation properties of copolymers derived from 3‐methacryloxypropyltris(trimethylsiloxy)silane and adamantyl group‐containing methacrylate derivatives

“…A broad halo was observed in all copolymer membranes, which indicates the formation of an amorphous structure. Each adamantane homopolymer was observed at angles 2θ = 14.5–16.4° ( d ‐spacing = 5.4–6.1 Å) in a previous study . Conversely, two broad peaks were observed at 2θ = 12° ( d ‐spacing = 7.4 Å) and 2θ = 17.4° ( d ‐spacing = 5.1 Å) in poly(SiMA).…”

“…By contrast, the D and S of poly(2‐MAdMA‐ co ‐SiMA) and poly(2‐EAdMA‐ co ‐SiMA) showed no considerable change with increasing adamantane content compared with poly(1‐AdMA‐ co ‐SiMA) (11.9:88.1 mol %). These results indicate that the increase in P contributed to an increase in D , regardless of the small adamantane content (11.7 mol %) in 1‐AdMA copolymer that has the highest fractional free volume ( FFV ) [ FFV : poly(1‐AdMA) (0.151), poly(2‐MAdMA) (0.129), and poly(2‐EAdMA) (0.125)].…”

“…Poly(SiMA) exhibited one step of decomposition, whereas all adamantane polymers showed two steps of decomposition. The first decomposition of adamantine polymers corresponded to the adamantane unit decomposition, and the second decomposition was the main chain decomposition . For poly(1‐AdMA‐ co ‐SiMA), the decomposition temperature ( T d ) of the copolymers was increased by approximately 20–40°C with increasing adamantane content compared with poly(SiMA).…”

Phototransparency and water vapor sorption properties of ABA‐type triblock copolymers derived from 6FDA‐TeMPD and poly(2‐methyl‐2‐adamantylmethacrylate)

“…In addition, adamantane was reported by some study that enhances thermal stability and gas permeability of polymer because its bulky structure restricts the mobility of polymer chains. Moreover, 2‐MAdMA was the best effectively inhibited the water vapor interaction in the homopolymer of methacrylate derivatives in previous study …”

“…The order of water concentration at the maximum pressure (i.e., p / p sat ≈ 0.8) was as follows: Block(61/39) > PI > Block(36/64) > Block(14/86) > PMAdMA. Water vapor concentration decreased with increased adamantane content because PMAdMA exhibited a hydrophobic property . However, the water vapor concentration of Block(61/39) was higher than that of PI.…”