Triple tandem catalyst mixtures for the synthesis of polyethylenes with varying structures

Journal of the American Chemical Society

Volumn 124, Issue 51, 2002, Pages 15280-15285

  Komon, Zachary J A ^a   Diamond, Gary M ^b   Leclerc, Margarete K ^b   Murphy, Vince ^b   Okazaki, Miho ^a   Bazan, Guillermo C ^a  

^a UNIVERSITY OF CALIFORNIA   (United States)

^b SYMYX TECHNOLOGIES   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

CASCADE CONNECTIONS; CATALYSIS; CATALYSTS; ETHYLENE; MONOMERS; SYNTHESIS (CHEMICAL);

SYNTHETIC PROTOCOLS;

POLYETHYLENES;

MONOMER; POLYETHYLENE; POLYETHYLENE DERIVATIVE; POLYMER;

ARTICLE; CATALYSIS; CATALYST; CHEMICAL COMPOSITION; CHEMICAL REACTION; CHEMICAL STRUCTURE; REACTION ANALYSIS; SYNTHESIS;

EID: 0347928820     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja0283551     Document Type: Article

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45. The instrument consists of an array of 48 individually controlled high-pressure batch reactors, approximately 15 mL capacity each, with magnetically coupled mechanical overhead stirring. Each reactor cell possesses its own pressure and temperature control, and gaseous inonomer and quench gas feed lines. Reagent stations with liquid dispensing robots, which are driven by Symyx software (Impressionist), are situated alongside the reactors, and are used to mix reagents where necessary and inject reagents into each cell of the reactor. Because reagents can added to the reactor cells at high pressures and high temperatures, catalyst combinations can be prepared, activated if necessary, and quickly injected into each cell at the equilibrated temperature and pressure of the polymerization reaction. Moreover, upon catalyst injection, real-time temperature, pressure, and ethylene uptake measurements can be made on each of the 48 cells simultaneously. This approach can produce large libraries of samples in a very short amount of time.
46. After removal from the reactor, the polymer products were dried to constant weight and characterized using the Symyx Rapid◇GPC system for molecular weight determination, and the Symyx Rapid◇FT-IR technique for a determination of branching content. The Rapid◇GPC technique provided molecular weight data at a rate of 6 min per polymer sample. To ascertain branching content of ethylene-α-olefin copolymers produced in the PPR, we relied on the Rapid◇FT-IR technique, which operates with a throughput of 2 min per sample. Polymer samples were prepared for analysis using liquid handling robots driven by the Symyx Impressionist software
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