Results 81 to 90 of about 5,101 (224)

Correlation Between Vinyl Content of Recycled HDPE and Polymer Degradation: An NMR Approach

Journal of Applied Polymer Science, Volume 142, Issue 47, December 15, 2025.
The degradation behavior of high‐density polyethylene (HDPE) during recycling depends on its vinyl group content. This study shows that 1H NMR spectroscopy enables accurate assessment of vinyl groups unlike FTIR. Changes in melt flow and molecular weight with multiple processing are linked to vinyl content which could enable tailor‐made re‐additivation
Kim Hao Ng, Frank Malz, Elke Metzsch‐Zilligen, Rudolf Pfaendner   +3 more
wiley   +1 more source

Natural and synthetic isoprene rubbers obtained using Ziegler–Natta catalysts

Тонкие химические технологии
Objectives. To compare the properties of rubber compounds and rubbers based on natural rubber RSS1 and synthetic isoprene rubbers obtained using Ti, Nd, Gd catalysts, both when used individually in the formulation of rubber compounds and when synthetic ...
A. A. Zuev, V. L. Zolotarev, I. P. Levenberg, L. A. Kovaleva, I. Sh. Nasyrov   +4 more
doaj   +1 more source

UHMWPE/HDPE in-reactor blends, prepared by in situ polymerization: synthetic aspects and characterization [PDF]

, 2017
This work covers the synthesis and characterization of in-reactor Ultra-High Molecular Weight Polyethylene/ High Density Polyethylene, UHMWPE/HDPE, blends by in situ polymerization in a single reactor, through dual catalyst immobilization. These blends
Cerrada, M. L., Cramail, H., Ferreira, A. E., Lorenzo, V., Lourenco, J. P., Pérez, Ernesto, Ressia, J., Ribeiro, M. R., Vallés, E.   +8 more
core   +4 more sources

The Alchemist, the Scientist, and the Robot: Exploring the Potential of Human‐AI Symbiosis in Self‐Driving Polymer Laboratories

Macromolecular Rapid Communications, Volume 46, Issue 23, December 5, 2025.
Can artificial intelligence fully replace humans in polymer discovery? How can we effectively harness AI's potential while preserving human creativity, ethics, and expertise? Does AI introduce new biases and interpretability challenges into SDL? This perspective aims to answer these important questions and advocates for symbiotic human‐AI intelligence ...
Bahar Dadfar, Berna Alemdag, Gözde Kabay   +2 more
wiley   +1 more source

An original growth mode of MWCNTs on alumina supported iron catalysts [PDF]

, 2009
Multi-walled carbon nanotubes (MWCNTs) have been produced from ethylene by Fluidized Bed Catalytic Chemical Vapor Deposition (FB-CCVD) on alumina supported iron catalyst powders.
Bernard, Daniel, Bordère, Serge, Caussat, Brigitte, Falqui, A., Gaillard, Patrice, Kalck, Philippe, Kihn, Yolande, Philippe, Régis, Plee, Dominique, Serp, Philippe   +9 more
core   +2 more sources

2,3‐Diboratabutadiene Complexes of Group 4 Metals and their Donor‐Induced Oxidative Cleavage to Methyleneboranes

ChemistryEurope, Volume 3, Issue 6, November 11, 2025.
GA: We here report the first perarylated 2,3‐diboratabutadiene dianion and its reaction with Cp2MCl2 (M = Zr, Hf) to afford unprecedented 2,3‐diboratabutadiene π‐complexes with unique coordination modes. Addition of an N‐heterocyclic carbene (NHC) to the complexes gives rise to the donor‐induced oxidation of the BB bond, resulting in two separate NHC ...
Philipp Grewelinger, Carsten Präsang, Bernd Morgenstern, David Scheschkewitz   +3 more
wiley   +1 more source

Paramagnetic species in Ziegler Natta catalysts

, 2023
Abstract: This doctoral thesis investigates the nature and behavior of paramagnetic Ti(III) species in industrial Ziegler-Natta catalysts (ZNCs) used for the polymerization of polyethylene and polypropylene and is the result of a collaborative effort between the EPR laboratories of the University of Torino, the University of Antwerp and the Giulio ...
openaire   +2 more sources

CHAIN REGULARITY OF ISOTACTIC POLYPROPYLENE DETERMINED BY DIFFERENT THERMAL FRACTIONATION METHODS [PDF]

, 2014
The chain regularity of isotactic polypropylene (iPP) homo- and random copolymers was characterized by different thermal fractionation methods in this study. Different stepwise temperature programs were applied in a calorimeter (DSC), in order to develop
Doshev, Petar, Gahleitner, Marcus, Horváth, Zsuzsanna, Menyhárd, Alfréd, Pukánszky, Béla, Tranninger, Cornelia, Varga, József   +6 more
core   +1 more source

Effect of EtOH/MgCl2 Molar Ratios on the Catalytic Properties of MgCl2-SiO2/TiCl4 Ziegler-Natta Catalyst for Ethylene Polymerization

Molecules, 2011
MgCl2-SiO2/TiCl4 Ziegler-Natta catalysts for ethylene polymerization were prepared by impregnation of MgCl2 on SiO2 in heptane and further treatment with TiCl4.
Piyasan Praserthdam, Supanan Patthamasang, Bunjerd Jongsomjit   +2 more
doaj   +1 more source

50th Anniversary Perspective: Living Polymerization—Emphasizing the Molecule in Macromolecules [PDF]

, 2017
The ideal of living polymerization has defined research in polymer chemistry over the past 50 years. In this Perspective, we present the case that this concept has enabled the treatment of polymers as organic molecules, rather than impure mixtures of ...
Grubbs, Robert B., Grubbs, Robert H.
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