Abstract
AbstractSolution 13C nuclear magnetic resonance (NMR) is used in conjunction with in situ solid‐state NMR to determine the effect of peroxide treatment on the chemical structure and morphology of ethylene−propylene copolymers. The copolymers contain increasing quantities of ethylene with the lowest ethylene content corresponding to pure isotactic polypropylene. The vis‐breaking of heterophasic ethylene‐propylene copolymers (HEPCs) is found to be influenced by the homogeneity of the chain sequences. The in situ vis‐breaking in solid‐state NMR reveals significant changes in mobility of the crystalline domains and the formation of a disordered crystal phase within the α structure is observed. Both solution and solid‐state NMR experiments confirm the greater sensitivity of copolymers containing short ethylene sequences to peroxide degradation. It is proposed that longer chain ethylene sequences resist chemical changes and provide some degree of protection from degradation as a result of the reactivity of the ethylene units.
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.
