Year-end Sale % OFF 
Abstract
Poly(ethylene-co-acrylic acid) copolymers of 3.1 and 3.9 mol % acrylic acid are fractionated with supercritical propane, butane, and dimethyl ether. The fractionations are performed isothermally using increasing pressure profiling that provides gram-size fractions with molecular-weight distributions of ∼ 1.2 to 3.0 as compared to the parent copolymers which have polydispersities near 6.0. It is possible to fractionate these acid copolymers with respect to chemical composition by first using one of the poor quality solvents, propane or butane, that solubilize the nonpolar ethylene-rich oligomers and then using dimethyl ether, a very strong solvent for these acid copolymers, to solubilize the acid-rich oligomers. The performance of the SCF fractionation is directly related to the cloud-point behavior exhibited by the copolymer-solvent mixture.
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.
