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SUMMARY:IMX Seminar Series - Development of High Performance Polyolefin El
 astomers
DTSTART:20230522T131500
DTEND:20230522T141500
DTSTAMP:20260506T045027Z
UID:5a4c6b347878273145c99f46a866354dea9200a25d5b6271c833f1ea
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Wen-Jun Wang\, Zhejiang University\, China\nPolyolefins 
 accounting for more than 50% of overall plastic consumption\, is the large
 st chemical product in the world. Polyolefin elastomer (POE)\, a random co
 polymer of ethylene and α-olefin\, is one of the high-end polyolefins pos
 sessing both rubbery elasticity and plastic processability. By designing a
 nd tailoring the chain structures that provide elasticity and plasticity\,
  POEs with better mechanical properties and performances can be synthesize
 d while maintaining the same copolymer composition. We thus design a comb 
 branched polyolefin elastomer (CPOE) using high-temperature solution tande
 m polymerization. The CPOE has a crystalline polyethylene (plasticity\, ha
 rd segment) as the side chain and the amorphous ethylene/α-olefin copolym
 er (elasticity\, soft segment) as the backbone.1 Both soft and hard segmen
 ts of the CPOE can be adjusted\, thus increasing the melting point and red
 ucing the glass-transition temperature. The rheological properties of the 
 CPOE reveal the influence of long side chains on the elastic-plastic trans
 ition\, chain conformation\, and melt viscosity. By incorporating diene ol
 efins in polymer chains\, a reversible dynamic cross-linking is introduced
  to offer a synchronous enhancement in mechanical properties and processab
 ility of the POE.2 Furthermore\, tandem polymerization kinetics models for
  the POE and CPOE are developed. Under the model’s guidance in controlli
 ng the addition of oligomerization catalyst\, the copolymer composition di
 stribution in the POEs is tailored to improve both strength and toughness 
 of the polymers.3 The polymer chain structure design and polymerization pr
 ocess control thus provide an effective way for the development of high-pe
 rformance polymers.\nReferences:\n1. K Zhang\, P Liu\, W-J Wang\, B-G Li\,
  W Liu\, and S Zhu\, Preparation of Comb-Shaped Polyolefin Elastomers Havi
 ng Ethylene/1-Octene Copolymer Backbone and Long Chain Polyethylene Branch
 es via a Tandem Metallocene Catalyst System\, Macromolecules 2018\, 51\, 8
 790−8799\n2. Y Xiao\, P Liu\, W-J Wang\, B-G Li\, Dynamically Cross-Link
 ed Polyolefin Elastomers with Highly Improved Mechanical and Thermal Perfo
 rmance\, Macromolecules 2021\, 54\, 10381−10387\n3. L Luo\, K Liu\, J Ji
 ang\, M Qi\, Q Li\, P Liu\, B-G Li\, W-J Wang\, Engineering Ethylene/1-Hex
 ene Copolymers from Ethylene Stock with a Model-Guided Catalyst Feeding Po
 licy\, Macromolecules 2022\, 55\, 462−471\nBio: Dr. Wen-Jun Wang is curr
 ently a professor of Chemical Engineering at Zhejiang University (ZJU) and
  an adjunct professor of McMaster University (Mac). He received a chemical
  engineering bachelor degree at ZJU in 1986. After receiving his PhD degre
 e in the field of polymer reaction engineering (PRE) at ZJU in 1995\, he u
 ndertook his post-doctoral research in PRE at Mac. Then he spent his caree
 r in R&D and management positions with Coveright Surfaces Canada and Nexwo
 od Industries Ltd\, Canada\, for several years before he joined the Depart
 ment of Chemical and Biological Engineering of ZJU as a faculty member in 
 2008. His research lies in high-performance polyolefins\, biodegradable po
 lymers/composites\, polymer nanocomposites\, and reuse/recycling of post-c
 onsumer polyolefins. He has authored over 140 papers and has more than 40 
 granted patents.
LOCATION:https://epfl.zoom.us/j/63993722592
STATUS:CONFIRMED
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