Abstract
In this study, the pervaporation performance of a hydroxyl terminated polybutadiene (HTPB) based polyurethane, synthesized by direct polycondensation was evaluated. Typical values of the permeation rate and the separation factor are 380 g/m 2 h and 60, respectively. The effects of the polyurethane composition, [hydroxyl terminated polybutadiene (HTPB)/4,4-dicyclohexylmethane diisocyanate (H 12MDI)/1,4-butane diol (1,4BD)] and the molecular weight of PU on the pervaporation performances were investigated. It was found that the permeation rate and the water/ethanol separation factor are strongly dependent on the molecular weight of PU and the ratio of hard segment to soft segment (H 12MDI/HTPB). To improve the pervaporation performance, chemical-graft polymerization of 2,3-epoxypropylmethacrylate (EPMA) onto the HTPB-based-PU membrane was considered. The hydrophilicity and permeation rate of the chemically grafted PU membrane were improved due to the decrease in the crystallinity of membrane. It was also found that the hydrogen-bonding index (HBI) can be utilized to explain the permselectivity properties of the prepared membranes.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: 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.