Abstract
A series of cis-polybutadiene(PB)/liquid crystal composite membranes, at several weight ratios, was prepared by casting from a tetrahydrofuran solution of cis-PB and three kinds of liquid crystal compounds (ABECA, ABEOA and ABMA), and then exposed to S 2Cl 2 vapor at room temperature for crosslinking. The effect of the composition of the membranes on the gas permeation has been investigated. The permeability coefficient to O 2 and N 2 was much lower up to a liquid crystalline fraction of 30 wt% and in the case of a liquid crystalline fraction above 30 wt% it rose greatly. The influence of testing temperature on the permeability of the membranes was also investigated, and the results show that the permeability coefficient towards gases, reveal a distinct jump in the vicinity of the crystal–liquid crystal phase transition temperature of liquid crystal compounds. It is noteworthy that the crystal–liquid crystal transition temperature ( T KN) in the composite membranes was about 30°C lower than that of the pure liquid crystal compound. The results suggested that the flexible chain of polymer is advantageous to reduce the T KN of liquid crystal compounds in composite membranes.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
