Continuous solution copolymerization of ethylene and octene-1 with constrained geometry metallocene catalyst

1999 ◽  
Vol 37 (15) ◽  
pp. 2949-2957 ◽  
Author(s):  
Wen-Jun Wang ◽  
Edward Kolodka ◽  
Shiping Zhu ◽  
Archie E. Hamielec
Keyword(s):  
Continuous Solution ◽  
Metallocene Catalyst ◽  
Constrained Geometry

Long chain branching in ethylene polymerization using constrained geometry metallocene catalyst

1998 ◽  
Vol 199 (11) ◽  
pp. 2409-2416 ◽  
Author(s):  
Wen-jun Wang ◽  
Dajing Yan ◽  
Paul A. Charpentier ◽  
Shiping Zhu ◽  
Archie E. Hamielec ◽  
...  
Keyword(s):  
Ethylene Polymerization ◽  
Metallocene Catalyst ◽  
Chain Branching ◽  
Long Chain Branching ◽  
Constrained Geometry ◽  
Long Chain

Gluing Solutions

2017 ◽  
Author(s):  
Philip Isett
Keyword(s):  
Stress Tensor ◽  
Compact Support ◽  
Smooth Solution ◽  
Continuous Solution ◽  
Total Momentum ◽  
Frame Of Reference ◽  
Galilean Transformation ◽  
Hölder Continuous ◽  
Pressure Form ◽  
Original Frame

This chapter deals with the gluing of solutions and the relevant theorem (Theorem 12.1), which states the condition for a Hölder continuous solution to exist. By taking a Galilean transformation if necessary, the solution can be assumed to have zero total momentum. The cut off velocity and pressure form a smooth solution to the Euler-Reynolds equations with compact support when coupled to a smooth stress tensor. The proof of Theorem (12.1) proceeds by iterating Lemma (10.1) just as in the proof of Theorem (10.1). Applying another Galilean transformation to return to the original frame of reference, the theorem is obtained.

scholarly journals Crystallization of Random Metallocene-Catalyzed Propylene-Based Copolymers with Ethylene and 1-Hexene on Rapid Cooling

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2091
Author(s):  
Daniela Mileva ◽  
Jingbo Wang ◽  
René Androsch ◽  
Katalee Jariyavidyanont ◽  
Markus Gahleitner ◽  
...  
Keyword(s):  
Mechanical Performance ◽  
Metallocene Catalyst ◽  
Nucleating Agent ◽  
Random Copolymers ◽  
Rapid Cooling ◽  
Significant Difference ◽  
Chip Calorimetry ◽  
High Cooling Rates ◽  
Fast Scanning Chip Calorimetry

Propylene-based random copolymers with either ethylene or 1-hexene as comonomer, produced using a metallocene catalyst, were studied regarding their crystallization behaviors, with a focus on rapid cooling. To get an impression of processing effects, fast scanning chip calorimetry (FSC) was used in addition to the characterization of the mechanical performance. When comparing the comonomer type and the relation to commercial grades based on Ziegler–Natta-type catalysts, both an interaction with the catalyst-related regio-defects and a significant difference between ethylene and 1-hexene was observed. A soluble-type nucleating agent was found to modify the behavior, but to an increasingly lesser degree at high cooling rates.

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