Ethene/Propene Copolymerization with High Product of Reactivity Ratios from a Single Center, Metallocene-Based Catalytic System

1998 ◽  
Vol 31 (11) ◽  
pp. 3409-3416 ◽  
Author(s):  
Maurizio Galimberti ◽  
Fabrizio Piemontesi ◽  
Ofelia Fusco ◽  
Isabella Camurati ◽  
Mara Destro
Keyword(s):  
Catalytic System ◽  
Reactivity Ratios ◽  
Single Center

scholarly journals Preparation of Butadiene-Isoprene Copolymer with High Vinyl Contents by Al(OPhCH3)(i-Bu)2/MoO2Cl2∙TNPP

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 527 ◽  
Author(s):  
Peipei Li ◽  
Kai Liu ◽  
Zhe Fu ◽  
Yongliang Yu ◽  
Zhaobo Wang ◽  
...  
Keyword(s):  
Catalytic System ◽  
Monomer Conversion ◽  
Experimental Results ◽  
Reactivity Ratios ◽  
Constant Ratio ◽  
Active Centers ◽  
Coordination Polymerization ◽  
Co Catalyst ◽  
Phenyl Phosphate

In this study, a butadiene-isoprene coordination polymerization was initiated by a binary molybdenum (Mo)-based catalytic system consisting of modified MoO2Cl2 as the primary catalyst, triethyl aluminum substituted by m-cresol as the co-catalyst and tris(nonyl phenyl) phosphate (TNPP) as the ligand. The effects of the amount of catalyst and type of co-catalyst were investigated in detail. Experimental results indicated that when the butadiene-isoprene coordination polymerization was initiated by the binary Mo-based catalytic system, the monomer conversion could reach 90%. The resulting butadiene units were primarily based on 1,2-structures, and the reactivity ratios of butadiene and isoprene were 1.13 and 0.31, respectively. The reaction in the catalytic system was attributed to the non-ideal and non-constant ratio copolymerization. When the addition of isoprene monomers was relatively low, the isoprene units on the butadiene-isoprene copolymers were primarily based on the 1,2- and 3,4-structures. Moreover, the orientation of active centers to 1,2- and 3,4-structures gradually decreased with an increase in the addition of isoprene monomers, which resulted in the generation of high vinyl butadiene-isoprene copolymers.

1655: Long-Term Functional Outcome in Orthotopic Bladder Replacement in Women: A Single Center Study

2007 ◽  
Vol 177 (4S) ◽  
pp. 549-549
Author(s):  
Hannes Steiner ◽  
Thomas Akkad ◽  
Christian Gozzi ◽  
Brigitte Springer-Stoehr ◽  
Georg Bartsch
Keyword(s):  
Functional Outcome ◽  
Single Center ◽  
Bladder Replacement ◽  
Single Center Study ◽  
Center Study

48: Single Center Comparison of Laparoscopic and Open Surgery for Adrenal Pheochromocytoma

2007 ◽  
Vol 177 (4S) ◽  
pp. 17-17
Author(s):  
Monish Aron ◽  
Georges-Pascal Haber ◽  
Jose R. Colombo ◽  
Troy R. Gianduzzo ◽  
Jason M. Hafron ◽  
...  
Keyword(s):  
Open Surgery ◽  
Single Center ◽  
Adrenal Pheochromocytoma

161: Robot-Assisted Laparoscopic Pyeloplasty - 5-Year Follow-Up in a Single Center

2007 ◽  
Vol 177 (4S) ◽  
pp. 55-55
Author(s):  
Christian Schwentner ◽  
Andreas Lunacek ◽  
Alexandre E. Pelzer ◽  
Richard Neururer ◽  
Wolfgang Horninger ◽  
...  
Keyword(s):  
Single Center ◽  
Laparoscopic Pyeloplasty ◽  
Robot Assisted

23: Renal Arterial Injuries: A Single Center Analysis of Management Strategies and Outcomes

2007 ◽  
Vol 177 (4S) ◽  
pp. 9-9
Author(s):  
Ephrem O. Olweny ◽  
Sean P. Elliott ◽  
Thomas X. Minor ◽  
Jack W. McAninch
Keyword(s):  
Management Strategies ◽  
Single Center ◽  
Arterial Injuries

Abstract #1059 Prognostic Factors of Metastatic Thyroid Carcinoma: A Single Center Retrospective Study

2018 ◽  
Vol 24 ◽  
pp. 249
Author(s):  
David Broome ◽  
Gauri Bhuchar ◽  
Ehsan Fayazzadeh ◽  
James Bena ◽  
Christian Nasr
Keyword(s):  
Prognostic Factors ◽  
Retrospective Study ◽  
Thyroid Carcinoma ◽  
Single Center
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