BEGIN:VCALENDAR VERSION:2.0 PRODID:-//ZContent.net//ZapCalLib 1.0//EN CALSCALE:GREGORIAN METHOD:PUBLISH BEGIN:VEVENT SUMMARY:Dual-Site Catalyst Strategy for Polypropylene Thermoplastic Elastom ers LOCATION:Chemistry A101 TZID:America/Denver DTSTART:20192001T000000 UID:2026-04-27-02-33-29@natsci.colostate.edu DTSTAMP:20260427T023329 Description:Research Seminar Abstract\n\nRoughly 300 million tons of plast ic enters the global economy each year. Each of these serve specific\, p roperty-based purposes in commodity materials. Most of these commercial pl astics are composed of more than one polymer\, adding complexity of pos t-consumer separation. Minimizing the material diversity in our economy i s crucial\, as recycling these multi-polymeric materials is costly and tim e inefficient when compared using landfills and incineration. One propose d solution is to employ homopolymer thermoplastic elastomers. These mater ials\, when synthesized by a dynamic metallocene catalyst system\, exhibit tunable thermal and mechanical properties and offer a viable solution to excessive plastic waste feedstocks. Investigations into the synthesis of s tereoblock polypropylene thermoplastic elastomers have taken place over 6 decades\, leading to current investigations by the Rieger group. To synthe size high-melting\, elastic polypropylene and address the lack of stereoco ntrol in homopolymer stereoblock growth\, dynamic dual-site metallocene catalysts are employed under manipulated reaction conditions. The mechanis tic interplays of interconverting chelate ring conformers\, polymer chain migration\, and chain-end epimerization towards varying polypropylene isot actic pentad contents will be discussed.\n\n \;\n\nMacromolecules 201 8\, 51 (3)\, 914-929 4:00 pm END:VEVENT END:VCALENDAR