Polystyrene/nylon1010 blend was prepared with supercritical CO_ 2 as the monomer/initiator carrier. The aggregation structures of both nylon1010 treated by supercritical CO_ 2 and the blend were studied. The results reveal that the crystallinity of the blend decreased a little as the PS content increased; there were apparent bacillary or fruticose crystalline on the surface of treated nylon1010 and PS/nylon1010 blend.
Nylon 66 membranes prepared by phase inversion method were modified with supercritical CO 2. XRD, SEM and water flux measurements were used to assess properties of membrane in modification. The intensity of diffraction peak of modified membrane increased as shown in XRD, it indicates that the degree of crystallinity of the membrane rised after modification. In fact, different structures could be made with CO 2 pressure:cellular structure at 8 MPa and lacy structure at 16 MPa. Water fluxes of the modified membranes were higher than that of the initial nylon 66 membrane which was 2.178×10 -5 g/(s·m 2·Pa). In the pressure range of 8～14 MPa, the water fluxes was reduced from 13.18×10 -5 g/(s·m 2·Pa) to 4.828×10 -5 g/(s·m 2·Pa), and was raised to 6.411×10 -5 g/(s·m 2·Pa) at pressure over 16 MPa.
