Membranes Filled with Carbon Nanotubes CNTs

2 Membranes Filled with Carbon Nanotubes (CNTs) 

6FDA-6FpDA-PDMS copolymer was chosen to be poly(imide siloxane) polymer matrix that was synthesized in the laboratory. The chemical formula of the polymeric material is shown in Fig. 8.66. According to GPC experiments, of the co-polymer was 62,330 g/mol andM was 1,31,300 g/mol. M of PDMS monomer 

In Table 8.25, gas permeabihties of poly(imide-siloxane) membranes with and without CNT loading are compared. Thus, incorporation of CNT decreased the He flow rate. On the other hand, N2 permeability seems to be statistically imchanged by CNT loading. 

Solubility and diffusivity were also compared for membranes without and with CNT loading. The results shown in Table 8.26 indicate that diffusivity decreased by incorporating CNTs. This is consistent with the incorporation of closed-ended CNTs that behave as impermeable filler. The solubility for N2 increased and as a result there was no change in permeability statistically. Thus, incorporation of CNT lowered the He permeability (Table 8.25) and hindered the diffusion path of N2, lowering its diffusivity (Table 8.26). 

The diffusivity data summarized in Table 8.28 shows tendencies similar to the permeability for CO2 gas the diffusivity increase stops at 2% CNT loading while for the gases such as O2, N2 and CH, the diffusivity keeps increasing up to the CNT loading of 10%. Hence it can be concluded that the increase in permeabihty of latter gases are due to the increase in diffusivity when the gases are allowed to pass through the CNT particles. 

---

Chapter 12 deals with carbon nanotube (CNT) fiUed membranes for PCMs. CNT-filled polyethylene terephthalate was blended with various polymers, injection molded and characterized by different methods. 

---