Improved permeability by incorporating polysiloxane in SBS block copolymers for CH4/N2 gas separation

Preparation of poly(ether‐block‐amide)/poly(amide‐co‐poly(propylene glycol)) random copolymer blend membranes for CO2/N2 separation

“…Pebax/PA‐PPG (20) blend membranes exhibited both Pebax 2533 and PA‐PPGs characteristic peaks. Since Pebax 2533 does not exist benzene ring, the intensity of CC deformation vibration of benzene ring can provide an estimation of the relative PA‐PPG content in Pebax/PA‐PPG blend membranes . It can be found from Fig.…”

Synthesis and gas transport properties of polyamide membranes containing PDMS groups

“…23 The peaks at 1.2 ppm are assigned to ÀCH * 3 groups protons of PDMS. 24 In addition, the peak at 10.2 ppm is originated by amide group proton, indicating the successful synthesis of PA-PDMS copolymers. The mechanical properties of the membranes were measured at room temperature ( Table 2).…”

Synthesis and CO2 separation of novel polyurethane membranes containing urea linkages

“…This phenomenon was due to the high number of N─H bonds, which formed a large number of roads to facilitate CO 2 transport . Second, the increase in the flexible siloxane (Si─O) bonds due to an increase in the PDMS chemical structure led to the expansion of molecular space and an increase in the free volume . However, P CH4 and P N2 did not change considerably because the increase in the P s of both were only related to PDMS .…”

“…As shown in Figure , an endothermic peak was observed in the synthesized PU at 25–30°C. This peak was attributed to the crystals that formed in the soft segment . The increase in crystallization in the high‐content PEG ( e.g ., PU‐a) was attributed to the increased number of polar bonds formed among the PEG chains in the crystal region due to the increase in the number of ether groups …”

“…33 Second, the increase in the flexible siloxane (Si─O) bonds due to an increase in the PDMS chemical structure led to the expansion of molecular space and an increase in the free volume. 35,36 However, P CH4 and P N2 did not change considerably because the increase in the Ps of both were only related to PDMS. 10 Recently, the gas performance of other PUs were also explored (Table IV).…”