Details

Autor(en) / Beteiligte

• Zhang, Kailun
• Liu, Pingwei
• Wang, Wen-Jun
• Li, Bo-Geng
• Liu, Weifeng
• Zhu, Shiping

Titel

Preparation of Comb-Shaped Polyolefin Elastomers Having Ethylene/1-Octene Copolymer Backbone and Long Chain Polyethylene Branches via a Tandem Metallocene Catalyst System

Ist Teil von

• Macromolecules, 2018-11, Vol.51 (21), p.8790-8799

Ort / Verlag

American Chemical Society

Erscheinungsjahr

2018

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A novel type of comb-branched ethylene/1-octene copolymer elastomers (CPOEs) was synthesized, and their properties were systematically investigated in this work. The polymers had crystalline polyethylene (PE) long chain branches attached to amorphous ethylene/1-octene random copolymer backbones. The unique structure was generated through a tandem catalyst system consisting of a Zr ligated with phenoxy­cycloalkylimine (FI-Zr) and a constrained geometry catalyst (CGC-Ti). Linear PE macromonomers, with over 88% chains terminally unsaturated, were synthesized with the FI-Zr catalyst, while the CGC-Ti catalyst was employed in the copolymerization of ethylene, 1-octene, and the PE macromonomer. The resulting CPOEs possessed high melting temperature (>120 °C) and low glass transition temperature (<−60 °C), suggesting a phase separation occurred in the copolymer system. The measurement of mechanical properties showed that the elongation at break reached >1200%. Some samples performed better strain recovery than the commercial POE Engage 8150.