NDLI: A New Catalytic System (2-PhInd)2ZrMe2/Al(iso-Bu)3 for the Synthesis of Stereoblock Polypropylene

Content Provider	Springer Nature Link
Author	Babkina, O. N. Bravaya, N. M. Nedorezova, P. M. Saratovskikh, S. L. Tsvetkova, V. I.
Copyright Year	2002
Abstract	A new efficient two-component homogeneous system consisting of (2-PhInd)$_{2}$ZrMe$_{2}$ and Al(iso-Bu)$_{3}$ cocatalyst was developed for the synthesis of elastomeric stereoblock polypropylene. The catalytic behavior of this system was studied in toluene and liquid propylene. It was shown that a change in the Al/Zr molar ratio enables one to vary the system activity, the kinetic characteristics of the polymerization process, and the properties of polypropylene over wide ranges. For example, an increase in the Al/Zr ratio from 50 to 300 mol/mol is accompanied by an increase in the activity by a factor of 4, an increase in the molecular weight from 80 000 to 220 000, and a decrease in isotactic pentad content from 39 to 16%. It was found that the polymerization rate is proportional to the concentration of Al(iso-Bu)$_{3}$ and to the square of the monomer concentration. Some assumptions about the nature of active centers and about reactions leading to the formation of these centers were made. A model for the formation of sequences of isotactic and atactic blocks was proposed. This model takes into account the multiple inversion of the active center (fast dynamic equilibrium) from the iso-specific to the nonspecific state during chain growth. This inversion is due to the coordination of an additional Al(iso-Bu)$_{3}$ molecule. This model satisfactorily describes the pentad composition of polypropylene samples as a function of the Al/Zr ratio.
Starting Page	341
Ending Page	350
Page Count	10
File Format	PDF
ISSN	00231584
Journal	Kinetics and Catalysis
Volume Number	43
Issue Number	3
e-ISSN	16083210
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2002-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physical Chemistry Catalysis
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis Modeling and Simulation Computer Science Applications

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Synthesis of crystallizable sydiotactic-atactic stereoblock polypropylene using a living polymerization system

Catalytic activity and physicochemical properties of Ni-Au/Al$_{3}$CrO$_{6}$ system for partial oxidation of methane to synthesis gas

KF promoted mesoporous γ-Al$_{2}$O$_{3}$ with strong basicity: Preparation, characterization and catalytic activitiy for transesterification to biodiesel

Hydrodesulfurization catalysts P-Mo-W/γ-Al$_{2}$O$_{3}$: Characterization and catalytic activity

Bulk propylene polymerization in the presence of ansa-metallocenes of C $_{2}$ and C $_{1}$ symmetries: From a rigid thermoplastic to elastomeric stereoblock polypropylene

Porous Pd-containing polypropylene membranes for catalytic water deoxygenation

Self-propagating synthesis of Pd-CeO$_{2}$/Al$_{2}$O$_{3}$ automotive monolith catalysts

Polymerization of methyl methacrylate using the NiX$_{2}$(PPh$_{3}$)$_{2}$/Zn catalytic system

Hydrothermal Synthesis of Porous Al$_{2}$O$_{3}$/Al Metal Ceramics: II. Mechanism of Formation of a Porous Al(OH)$_{3}$/Al Composite

A New Catalytic System (2-PhInd)2ZrMe2/Al(iso-Bu)3 for the Synthesis of Stereoblock Polypropylene

Similar Documents

Synthesis of crystallizable sydiotactic-atactic stereoblock polypropylene using a living polymerization system

Catalytic activity and physicochemical properties of Ni-Au/Al$_{3}$CrO$_{6}$ system for partial oxidation of methane to synthesis gas

KF promoted mesoporous γ-Al$_{2}$O$_{3}$ with strong basicity: Preparation, characterization and catalytic activitiy for transesterification to biodiesel

Hydrodesulfurization catalysts P-Mo-W/γ-Al$_{2}$O$_{3}$: Characterization and catalytic activity

Bulk propylene polymerization in the presence of ansa-metallocenes of C $_{2}$ and C $_{1}$ symmetries: From a rigid thermoplastic to elastomeric stereoblock polypropylene

Porous Pd-containing polypropylene membranes for catalytic water deoxygenation

Self-propagating synthesis of Pd-CeO$_{2}$/Al$_{2}$O$_{3}$ automotive monolith catalysts

Polymerization of methyl methacrylate using the NiX$_{2}$(PPh$_{3}$)$_{2}$/Zn catalytic system

Hydrothermal Synthesis of Porous Al$_{2}$O$_{3}$/Al Metal Ceramics: II. Mechanism of Formation of a Porous Al(OH)$_{3}$/Al Composite

A New Catalytic System (2-PhInd)2ZrMe2/Al(iso-Bu)3 for the Synthesis of Stereoblock Polypropylene