Abstract
Low density polyethylenes made by the known high pressure processes show significantly different molecular structures. The physical and technological properties are closely related to molecular structure and morphology. For example, the adhesive strength of a laminate consisting of an ozone treated low density polyethylene film and an aluminum foil depends strongly on the synthesis conditions. The molecular structures and dilute solution properties of many fully aromatic thermotropic liquid crystalline copolyesters can now be determined using the new solvent 3,5-bis(trifluoromethyl)phenol. A typical random copolyester was fractionated by precipitation from solution, and the fractions were studied in detail by viscometry, integrated and dynamic light scattering, and size exclusion chromatography. From the structure data thus obtained the molecular mass distribution and the persistence length were calculated. Polymer blends, block copolymers, and graft copolymers can be characterized by fractionation procedures using demixing solvents in an ultracentrifuge and subsequent analysis of the fractions.
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.
