Sustainable Chemistry and Pharmacy, Journal Year: 2025, Volume and Issue: 45, P. 101988 - 101988
Published: March 14, 2025
Language: Английский
Journal of Polymers and the Environment, Journal Year: 2024, Volume and Issue: 32(6), P. 2629 - 2643
Published: Jan. 17, 2024
Abstract In this study, a new polymeric oleic acid-derived macro addition/fragmentation transfer agent was utilized to produce poly(styrene)- g -poly(oleic acid) graft copolymer. The double bond of acid initially saturated with bromine and the condensation polymerization between carboxylic bromide resulted in polyoleic pendant groups. Xanthate groups were exchanged obtain poly(oleic RAFT (Pole-Xa). Poly(styrene)- (PS- -Pole) copolymers synthesized via reversible addition fragmentation (RAFT) styrene reaction evaluated view kinetics. effects temperature time on copolymer yield, conversion molecular weight investigated. styrene, rate constant (k) found be 1.83 × 10 –3 L/mol/dk 7.27 –4 for temperatures 80 90 °C, respectively. structural characteristics thermal properties obtained products characterized using FT-IR, 1 H-NMR, GPC, TGA, DSC SEM–EDX.
Language: Английский
Citations
3
ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: unknown
Published: April 23, 2024
Poly(vinylidene fluoride) (PVDF) shows excellent chemical and thermal resistance displays high dielectric strength unique piezoelectricity, which are enabling for applications in membranes, electric insulators, sensors, or power generators. However, its low polarity lack of functional groups limit wider applications. While inert, PVDF has been modified by grafting polymer chains atom transfer radical polymerization (ATRP), albeit via an unclear mechanism, given the strong C–F bonds. Herein, we applied eosin Y green-light-mediated ATRP to modify PVDF-based materials. The method gave nearly quantitative (meth)acrylate monomer conversions within 2 h without deoxygenation formation unattached homopolymers, as confirmed control experiments DOSY NMR measurements. gamma distribution model that accounts broadly dispersed polymers was essential serves a powerful tool analysis PVDF. poly(methyl acrylate) graft chain-ends on PVDF-CTFE (statistical copolymer with chlorotrifluoroethylene) carried out successfully first time showed up 23 grafts per chain. density tunable depending solvent composition light intensity during grafting. initiation proceeded either from C–Cl sites unsaturations backbones. dehydrofluorinated 20 times more active than saturated PVDF, PVDF-HFP, Viton A401C. obtained PVDF-CTFE-g-PnBMA materials were investigated detail. They featured slightly lower crystallinity (12–18 vs 24.3%) had greatly improved mechanical performance: Young's moduli 488 MPa, ductility 316%, toughness 46 × 106 J/m3.
Language: Английский
Citations
3
Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: unknown
Published: Nov. 29, 2024
Abstract Photomediated Atom Transfer Radical Polymerization (photoATRP) is an activator regeneration method, which allows for the controlled synthesis of well‐defined polymers via light irradiation. Traditional photoATRP often limited by need high‐energy ultraviolet or violet light. These could negatively affect control and selectivity polymerization, promote side reactions, may not be applicable to biologically relevant systems. This drawback can circumvented introduction catalytic amount photocatalysts, absorb visible and/or NIR and, therefore, controlled, regenerative ATRP performed with dual‐catalytic cycle. Herein, a critical summary recent developments in field dual‐catalysis concerning Cu‐catalyzed provided. Contributions involved species are examined mechanistically, followed challenges future directions towards next generation advanced functional macromolecular materials.
Language: Английский
Citations
3
Macromolecular Rapid Communications, Journal Year: 2025, Volume and Issue: unknown
Published: Feb. 2, 2025
Abstract The synthesis of well‐defined hyperbranched aromatic polymer by Kumada‐Tamao catalyst‐transfer condensation polymerization AB 2 monomer is investigated. Grignard generated treatment 2‐(3,5‐dibromophenyl)‐3‐hexyl‐5‐iodothiophene ( 1 ) with 1.0 equivalent isopropylmagnesium chloride in THF at 0 °C for h and subsequently polymerized Ni(dppe)Cl room temperature h. molecular weight the obtained increases linearly up to ≈30 000 proportion ratio [consumed ] /[Ni(dppe)Cl conversion , while a narrow distribution maintained M w / n ≤ 1.12). matrix‐assisted laser desorption/ionization time‐of‐flight (MALDI‐TOF) mass spectrum shows almost single series peaks due hydrogen one end bromine other, as case catalyst transfer monomers. degree branching (DB) polymers 0.70–0.75, irrespective polymerization. These results indicate that proceeds chain‐growth manner through intramolecular mechanism, affording higher DB than theoretical value 0.5 conventional polycondensation
Language: Английский
Citations
0
Sustainable Chemistry and Pharmacy, Journal Year: 2025, Volume and Issue: 45, P. 101988 - 101988
Published: March 14, 2025
Language: Английский
Citations
0