Abstract
Thermal properties and solid-state structure of copolyesters based on smectic poly(diethylene glycol 4,4‘-bibenzoate) (PDEGBB) and non-liquid crystalline poly(diethylene glycol isophthalate) (PDEGI) were characterized previously. The present study examined the oxygen transport properties and free volume characteristics of quenched films with 10−50 mol % isophthalate. Isophthalate was not accommodated in the smectic lattice; as a result, copolymerization effectively disrupted the LC character. The estimated smectic volume fraction of PDEGBB was 0.84. Copolymerization with 10 and 20 mol % isophthalate decreased the smectic fraction to 0.59 and 0.16, respectively. The copolymer with 30 mol % isophthalate did not exhibit any LC character. Decreasing density and increasing free volume hole size accompanied the loss of LC features. Oxygen permeability also increased due to increases in both solubility and diffusivity. Oxygen solubility of LC glasses conformed to a two-phase model consisting of a less permeable ...
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.
