European Polymer Journal

Journal: European Polymer Journal

Abbreviation

Eur. Polym. J.

Publisher

Elsevier

ISSN

0014-3057
1873-1945

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Publications1 - 10 of 27

Assembly of poly-3-(hexylthiophene) nanocrystals in marginal solvent: The role of PCBM
Da Pian, Marta; Maggini, Michele; Vancso, G. Julius; et al. (2018)
European Polymer Journal
Polyoxazoline biointerfaces by surface grafting
Morgese, Giulia; Benetti, Edmondo M. (2017)
European Polymer Journal
RAFT polymerization of renewable monomers with dithiobenzoates: Effect of Z-group substituents and reaction conditions
Boner, Silja; Parkatzidis, Kostas; De Alwis Watuthanthrige, Nethmi; et al. (2024)
European Polymer Journal
The use of renewable polymer feedstocks has attracted significant attention recently due to increased concerns about petrochemical-based materials and limited fossil-based resources. As a promising candidate, lignin-derived monomers have been polymerized via controlled radical polymerization to yield bio-based materials. Arguably, the most commonly employed polymerization methodology is reversible-addition-fragmentation chain-transfer (RAFT) polymerization which utilizes, almost exclusively, 2-cyano-2-propyl benzodithioate as a chain transfer agent (CTA). Despite the robustness of this approach, polymerization of lignin-derived methacrylates is far more challenging than of the commonly used monomers (e.g. methyl methacrylate), often resulting in polymers with moderate control over the molecular weight and dispersity (Đ). To improve control over the RAFT polymerization, we investigate here a series of 2-cyano-2-propyl benzodithioate derivatives, where the electronic properties of the Z group were systematically altered. The introduction of electron-withdrawing groups in the para-position of the phenyl ring of the Z group increased control over the polymerization by improving the chain transfer coefficient of the CTA, resulting in enhanced control over molecular weights and lower Đs. Conversely, the incorporation of electron-donating groups had the opposite effect. 2-cyano-2-propyl 4-cyanobenzodithioate was found to be the optimal CTA for the polymerization of a series of lignin-derived monomers resulting in Đs < 1.25. The robustness of the system was highlighted by the synthesis of higher molecular weights polymers and the efficient chain-extension of macroCTAs; the latter case yielding bio-based block copolymers with a Đ as low as 1.16. This work highlights that RAFT polymerization can, upon judicious optimization, be successfully employed for the synthesis of renewable polymers.
Surface-grafted assemblies of cyclic polymers: Shifting between high friction and extreme lubricity
Divandari, Mohammad; Morgese, Giulia; Ramakrishna, Shivaprakash N.; et al. (2019)
European Polymer Journal
Photoactive silica nanoparticles: Influence of surface functionalization on migration and kinetics of radical-induced photopolymerization reactions
Sahin, Melahat; Krawczyk, Krzysztof; Roszkowski, Piotr; et al. (2018)
European Polymer Journal
Fluorine and hydroxyl containing unsymmetrical a-diimine Ni (II) dichlorides with improved catalytic performance for ethylene polymerization
Wu, Ruikai; Stieglitz, Lucas; Lehner, Sandro; et al. (2023)
European Polymer Journal
A series of new tailored a-diimine Ni (II) complexes (Ni-OH, Ni-FOH, Ni-PhOH, and Ni-PhFOH) containing bulky ortho-N-aryl groups with various dibenzhydryl substitutes was successfully synthesized, characterized and applied in ethylene polymerization. The a-diimine ligands and Ni (II) complexes were characterized by 1H, 19F, and 13C NMR, elemental analysis, and high resolution electrospray ionization mass spectrometry (ESI-HRMS). The X-ray crystallographic study of metal complexes Ni-OH, Ni-FOH, and Ni-PhFOH revealed their distorted tetrahedral geometry. An unsymmetrical steric-enhancement design approach was employed to modulate the competition between the monomer insertion and the chain-walking process in ethylene polymerization. This facile design resulted in a high catalytic activity and yielded high molecular weight PE. The catalytic activity of these complexes was optimized by varying the polymerization conditions (temperature, time, and ethylene pressure), use of co-catalysts and variation of the Al/Ni ratio. When activated with modified methylaluminoxane (MMAO), these Ni complexes exhibited the activity as high as 29.1 × 106 g of PE (mol of Ni)−1 h−1), with a molecular weight of 1.81 × 106 g mol−1. Their thermal stability was well pronounced at elevated temperatures; high activity of 2.88 × 106 g of PE (mol of Ni)−1 h−1 and high molecular weight PE (0.86 × 106 g mol−1obtained at 90 °C). PEs with tunable branches and high melting points (127.5 °C) were obtained, which is a typical feature of LLDPE. The incorporation of fluorine atoms on N-aryl groups had a strong positive influence on the catalytic activity of the Ni complexes and favored the chain-growth process in the ethylene polymerization. Surprisingly, the simultaneous presence of terminal hydroxyl group in these complexes did not adversely affect their catalytic activity, while offering the possibility for covalent attachment to the solid supports for future heterogeneous polymerization.
Synthesis of temperature responsive polymer brushes from polystyrene latex particles functionalized with ATRP initiator
Mittal, V.; Matsko, N. B.; Butté, A.; et al. (2007)
European Polymer Journal
New Nonlinear Optical Polyamides
Kwon, Oil-P.; Rezzonico, Daniele; Kwon, Seong-Ji; et al. (2008)
European Polymer Journal
Crystallization kinetics of polymer fibrous nanocomposites
Galeski, Stanisaw; Piorkowska, Ewa; Rozanski, Artur; et al. (2016)
European Polymer Journal
A series of enzyme-controlled-release polymer-platinum-based drug conjugates for the treatment of gastric cancer
Shi, Tianyi; Gu, Lianshuai; Sun, Yu; et al. (2017)
European Polymer Journal

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