Polyolefin: Synthesis, Properties, and Characterization

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Polymer Chemistry".

Deadline for manuscript submissions: 15 November 2024 | Viewed by 974

Special Issue Editor


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Guest Editor
CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
Interests: olefin polymerization; Ziegler–Natta catalysts; transition metal catalysts; oligomerization; polyolefin functionalization; polyolefin materials; polyolefin processing; polyolefin characterization
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Special Issue Information

Dear Colleagues,

Due to the excellent performance and high cost effectiveness, polyolefin has become the most widely used engineering plastic in the world and remains the synthetic resin type with the largest capacity growth, especially in China. The continuous development of olefin polymerization catalysts, polymerization processes, and processing techniques has provided us with a large number of new polyolefin materials, and emerging industries continue to put forward new needs and requirements for polyolefin materials, which constantly promotes the development of polyolefin materials. Although the monomer unit structure of polyolefin is simple, the complexity of the polyolefin structure and the wide range of properties due to the regularity, branching, end-group structure, distribution of monomer units on the molecular chain, molecular weight distribution, etc., require constantly innovative methods to understand the microstructure and the structure of the aggregation state. It is hoped that researchers from academia and industry will work together to continuously promote the development of polyolefins and create a better future.

Dr. Huayi Li
Guest Editor

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Keywords

  • polyolefin
  • Ziegler–Natta catalysts
  • transition metal catalysts
  • coordination polymerization
  • characterization

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Published Papers (1 paper)

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Research

15 pages, 4010 KiB  
Article
Synthesis of High-Molecular-Weight Polypropylene Elastomer by Propylene Polymerization Using α-Diimine Nickel Catalysts
by Lujie Gao, Hegang Ren, Yanhui Hou, Linlin Ye, Hao Meng, Binyuan Liu and Min Yang
Polymers 2024, 16(16), 2376; https://doi.org/10.3390/polym16162376 - 22 Aug 2024
Viewed by 626
Abstract
The α-diimine late transition metal catalyst represents a new strategy for the synthesis of atactic polypropylene elastomer. Taking into account the properties of the material, enhancing the molecular weight of polypropylene at an elevated temperature through modifying the catalyst structure, and further increasing [...] Read more.
The α-diimine late transition metal catalyst represents a new strategy for the synthesis of atactic polypropylene elastomer. Taking into account the properties of the material, enhancing the molecular weight of polypropylene at an elevated temperature through modifying the catalyst structure, and further increasing the activity of α-diimine catalyst for propylene polymerization, are urgent problems to be solved. In this work, two α-diimine nickel(II) catalysts with multiple hydroxymethyl phenyl substituents were synthesized and used for propylene homopolymerization. The maximum catalytic activity was 5.40 × 105 gPP/molNi·h, and the activity was still maintained above 105 gPP/molNi·h at 50 °C. The large steric hindrance of catalysts inhibited the chain-walking and chain-transfer reactions, resulting in polypropylene with high molecular weights (407~1101 kg/mol) and low 1,3-enchainment content (3.57~16.96%) in toluene. The low tensile strength (0.3~1.0 MPa), high elongation at break (218~403%) and strain recovery properties (S.R. ~50%, 10 tension cycles) of the resulting polypropylenes, as well as the visible light transmittance of approximately 90%, indicate the characteristics of the transparent elastomer. Full article
(This article belongs to the Special Issue Polyolefin: Synthesis, Properties, and Characterization)
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