New Advances in Olefin Polymerization Catalysis

A special issue of Catalysts (ISSN 2073-4344). This special issue belongs to the section "Catalysis in Organic and Polymer Chemistry".

Deadline for manuscript submissions: closed (30 June 2022) | Viewed by 2522

Special Issue Editor


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Guest Editor
Dipartimento di Scienze Chimiche, Università di Napoli Federico II, Via Cintia, 80126 Napoli, Italy
Interests: advanced high-throughput experimentation (HTE) as a smart tool for the investigation of olefin polymerization catalysts and processes

Special Issue Information

Dear Colleagues,

It is my pleasure to invite your contributions to a Special Issue of Catalysts dedicated to recent progress in olefin polymerization catalysis.

Polymers represent about 80% by weight of the global chemical industry throughput, and polyolefins amount to roughly 50% by weight of the overall polymer market. These amazing figures highlight, at the same time, an incredible success story and a dramatic threat for the environment due to the mounting stream of plastic wastes that continue to accumulate virtually everywhere.

The two phenomena, which can be viewed as opposite sides of the same coin, can be traced to marvelous coordination catalysts which effortlessly convert olefins into nondegradable plastics and can continue to do so until our entire planet is covered with them unless we identify an alternative.

Human societies need polyolefins, which have a better cost-to-performance balance and carbon footprint than all other presently available materials. On the other hand, we must find ways to make polyolefins compatible with a circular economy; for that, we need even better catalysts than those we have now, in order to produce polyolefin materials with an extended lifetime for nondisposable applications, and improved properties so the same performance can be achieved with less. On top of that, we should not abandon the ambition to depolymerize polyolefin chains through smart chemical designs or processes once their lifecycle has ended.

Improving something which is close to perfection is exceedingly difficult. As far as polyolefin catalysts are concerned, further innovation can come from novel high throughput experimentation tools and methods, opening the door to focused trial-and-error searches based on efficient statistical models with predictive ability. On the same streamline, the advent of machine learning, aided by artificial intelligence, can provide previously unimaginable opportunities to face chemical and physical problems of defying complexity.

This Special Issue aims to cover the latest progress and advances in the field of catalytic olefin polymerization in the aforementioned context. That includes but is not limited to the main families of catalysts (namely, Ziegler–Natta, metallocenes, nonmetallocenes) and activators, as well as the aspects related to reaction mechanisms, molecular kinetics, and polymerization process technology.

Dr. Antonio Vittoria
Guest Editor

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Keywords

  • olefin polymerization catalyst
  • Ziegler–Natta catalyst
  • metallocene catalyst
  • polyolefin
  • high-throughput experimentation
  • polymerization technology

Published Papers (1 paper)

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Research

9 pages, 1759 KiB  
Communication
Modification of the Acyl Chloride Quench-Labeling Method for Counting Active Sites in Catalytic Olefin Polymerization
by Haoyang Yang, Biao Zhang, Wentao Zhong, Zhisheng Fu and Zhiqiang Fan
Catalysts 2021, 11(6), 683; https://0-doi-org.brum.beds.ac.uk/10.3390/catal11060683 - 28 May 2021
Cited by 1 | Viewed by 1869
Abstract
The reliable and efficient counting of active sites in catalytic olefin polymerization has been realized by using acyl chloride as the quench-labeling agent. However, the molar ratio of acyl chloride to the alkylaluminum cocatalyst must be larger than 1 in order to completely [...] Read more.
The reliable and efficient counting of active sites in catalytic olefin polymerization has been realized by using acyl chloride as the quench-labeling agent. However, the molar ratio of acyl chloride to the alkylaluminum cocatalyst must be larger than 1 in order to completely depress side reactions between the quencher and Al-polymeryl that is formed via chain transfer reaction. In this work, a tetrahydrofuran/thiophene-2-carbonyl chloride (THF/TPCC) mixture was used as the quenching agent when counting the active sites of propylene polymerization catalyzed by MgCl2/Di/TiCl4 (Di = internal electron donor)-type Ziegler–Natta catalyst activated with triethylaluminum (TEA). When the THF/TEA molar ratio was 1 and the TPCC/TEA molar ratio was smaller than 1, the [S]/[Ti] ratio of the polymer quenched with the THF/TPCC mixture was the same as that quenched with only TPCC at TPCC/TEA > 1, indicating quench-labeling of all active sites bearing a propagation chain. The replacement of a part of the TPCC with THF did not influence the precision of active site counting by the acyl chloride quench-labeling method, but it effectively reduced the amount of acyl chloride. This modification to the acyl chloride quench-labeling method significantly reduced the amount of precious acyl chloride quencher and brought the benefit of simplifying polymer purification procedures after the quenching step. Full article
(This article belongs to the Special Issue New Advances in Olefin Polymerization Catalysis)
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