Ricinoleic and oleic acid based precursors as the sole constituents of thermosetting bioderived polymers

Reactive and Functional Polymers, Год журнала: 2025, Номер 208, С. 106155 - 106155

Опубликована: Янв. 5, 2025

Язык: Английский

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Understanding the Topology Freezing Temperature of Vitrimer-Like Materials through Complementary Structural and Rheological Analyses for Phase-Separated Network

ACS Macro Letters, Год журнала: 2025, Номер unknown, С. 182 - 187

Опубликована: Янв. 27, 2025

Vitrimers are sustainable cross-linked polymers characterized by an associative bond exchange mechanism within their network. A well-known feature of vitrimers is the Arrhenius dependence viscosity or relaxation time. Another important aspect existence a topology-freezing temperature (Tv), which represents transition between viscoelastic solid state and malleable liquid state. Various methods, including viscosity-temperature plots temperature-ramp creep (or dilatometry), have been proposed for determining Tv. In this study, we complementarily employ X-ray scattering-based structural analysis rheological to assign Tv in phase-separated vitrimer-like materials undergoing trans-N-alkylation exchange. Note that progresses via dissociative pathway, whereas our previous studies demonstrated temperature-dependence time followed dependence, was reason classification as material. Specifically, identify at anomalous increase domain distance occurs during rubbery analysis. analysis, corresponds marking shift from Williams–Landel–Ferry factors used create master curves frequency sweep rheology data. Importantly, both methods yield nearly same Tv, validating accuracy assignment and, thus, providing valuable insights into specific properties vitrimers.

Язык: Английский

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How to Characterize Covalent Adaptable Networks: A User Guide

ACS Polymers Au, Год журнала: 2025, Номер unknown

Опубликована: Апрель 17, 2025

Язык: Английский

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Qualification of the Vitrimeric Matrices in Industrial-Scale Wet Filament Winding Processes for Type-4 Pressure Vessels

Polymers, Год журнала: 2025, Номер 17(9), С. 1146 - 1146

Опубликована: Апрель 23, 2025

The production of fibre-reinforced composites for use in applications such as type-4 pressure vessels hydrogen storage is achieved through the a thermoset matrix. However, recycling thermosets presents significant challenge due to lack established methods. Epoxy-based vitrimers show characteristics during manufacturing and utilisation phases but exhibit thermoplastic behaviour at elevated temperatures 190 °C. This study investigates industrial-scale carbon fibre reinforced via wet filament winding, exemplified by vessel demonstrator. Processing conditions industrial processes have yet be applied vitrimers; therefore, two vitrimer formulations are compared conventional epoxy thermoset. processability resulting composite quality wound using these materials matrices compared. mechanical properties an interlaminar shear strength test, demonstrating that vitrimeric 19.8% (23 °C) 49.2% (140 improved strength. Consequently, epoxy-based investigated this can employed direct replacement matrix applications, with potential composite. To increase qualities, winding process must adapted vitrimers, since pore free could not achieved.

Язык: Английский

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Understanding vitrimer properties through various aspects of inhomogeneity

Polymer Journal, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 22, 2024

Язык: Английский

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