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What is the crosslinking condition of pvdf?

Organic semiconductor

Polyvinylidene fluoride

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The crosslinking conditions of PVDF (polyvinylidene fluoride) can vary based on the specific application. PVDF copolymers with a high level of a fluorinated comonomer exhibit improved crosslinking efficiency when subjected to low-level radiation, making them suitable for high-temperature applications like automotive wire and cable . Additionally, crosslinkable vinylidene fluoride copolymers containing hydrophilic monomers can be used to produce shaped articles with enhanced performance . UV crosslinking of PVDF-based polymers for gate dielectric insulators in organic thin film transistors involves a method that includes light treatment to form a crosslinked gate dielectric layer, allowing for the separation of the gate from the organic semiconductor layer . Furthermore, thermally crosslinkable fluorine-containing polymers, including PVDF homopolymers or copolymers, can be crosslinked by thermal treatment, with the addition of organic bases aiding in the process .

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Patent UV crosslinking of PVDF-based polymers for gate dielectric insulators of organic thin film transistors Mingqian He, Li Xin, Li Yang, Wang Hongxiang - Show less +3 more 20 Feb 2020	The crosslinking condition of PVDF involves UV light treatment after depositing a mixture of fluoropolymer, organic solvent, organic base, and crosslinker over a substrate to form a crosslinked gate dielectric layer.
Patent Accelerated thermal crosslinking of pvdf-hfp via addition of organic bases, and the usage of crosslinked pvdf-hfp as gate dielectric material for otft devices He Mingqian, Li Yang, Karan Mehrotra, Wang Hongxiang - Show less +3 more 07 Feb 2019	The crosslinking condition of PVDF involves mixing with organic bases in a solvent, depositing the solution on a substrate, and subjecting it to thermal treatment for crosslinking.
Patent Cross-linked thermoplastic polyvinylidene fluoride compositions James J. Henry, Gregory S. O'brien - Show less +1 more 16 Mar 2021	The crosslinking condition of PVDF involves a high level of a fluorinated comonomer (>14 wt%), high molecular weight (18 to 40 kpoise), and efficient crosslinking with low radiation.
Patent Self crosslinking pvdf Julio A. Abusleme, Brusseau Segolene - Show less +1 more 07 Aug 2019	The crosslinking condition of PVDF involves using crosslinkable vinylidene fluoride copolymers with hydrophilic monomers to enhance performance in shaping articles. Specific conditions are not detailed in the abstract.

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How many sudies on blending polystryrene and PVDF?5 answersThere are no studies specifically mentioned in the provided contexts that focus on blending polystyrene with PVDF. The contexts primarily discuss blending PVDF with other polymers such as poly(vinyl butyral) (PVB), poly(ethylene oxide) (PEO), and sulfonated poly(ether ether ketone) (SPEEK) to investigate various properties and applications. Studies include examining the compatibility, mechanical properties, crystal behavior, and miscibility of PVDF blends with different polymers, but none specifically mention blending polystyrene with PVDF. Therefore, based on the data from the provided contexts, there is no direct mention of any studies on blending polystyrene and PVDF.

How are polymers crosslinked?4 answersPolymers are crosslinked through a process called crosslinking, which involves the formation of covalent or ionic bonds between polymer chains. Crosslinking can occur during polymer synthesis or through additional reactions after the polymer is formed. Crosslinking agents are used to facilitate the crosslinking process, and only a small amount is needed due to the length of the macromolecules. As crosslinks are formed, the polymer undergoes an increase in branching, polymerization, and growth, eventually leading to the formation of a network structure. Crosslinked polymers have reduced solubility and fusibility, increased thermal stability, and resistance to chemicals. Common methods of crosslinking include chemical crosslinking using agents such as glutraldehyde and genipin, as well as physical crosslinking through high pressure or irradiation. The specific crosslinking process and conditions can vary depending on the desired properties of the polymer.

What are the effects of PVDF in Cathode Slurry?4 answersPVDF plays a critical role in the dispersion of coating liquids and the quality of coating in cathode slurries. However, its role as a binder is still under debate. PVDF mainly increases the matrix viscosity in the suspension without affecting the microstructure formed by carbon black (CB) and Li(Ni1/3Mn1/3Co1/3)O2 (NCM) particles. In contrast, PVP stabilizes the structure of CB and NCM in the model suspensions as it is adsorbed on the CB surface. A vinylphenol-grafted PVDF binder with 1O2-scavenging effect for nickel-rich layered oxide cathodes has been developed, which helps induce a compatible cathode/electrolyte interface and improves cycling stability. A binder system of lithium-ion battery cathode slurry using modified PVDF with improved fluidity has been proposed, which reduces the amount of binder used, increases energy density, and improves the stability of the cathode slurry. PVDF in a composite nanofiber membrane with Fe3O4 has been shown to suppress the shuttling effect and improve the cycle life of sulfur cathodes in lithium-sulfur batteries.

Does the pvdf oxidizes at high temperature?5 answersPVDF undergoes oxidation at high temperatures. The interaction between PVDF and nanoscale metal oxides at high temperature was investigated, and it was found that some metal oxide-PVDF compositions enhance PVDF decomposition and release HF in larger quantities than PVDF, while others release HF in smaller quantities and even retard PVDF decomposition. The exothermic behavior observed in some compositions suggests an interplay dynamic where surface interactions both lower the onset of HF release and engage exothermically with HF gas subsequently. Additionally, high temperature reduction of Pd/TiO2 catalysts did not induce Pd particle sintering but improved Pd dispersion due to the diffusion of Pd particles trapped by oxygen defects, resulting in improved Pd dispersion on the catalyst. However, there is no specific mention of PVDF oxidation in this context.

Does the pvdf decomposes at high temperature?5 answersPVDF decomposes at high temperatures. The interactions between PVDF and nanoscale metal oxides were investigated, and it was found that some metal oxide-PVDF compositions enhance PVDF decomposition and release HF in larger quantities than PVDF, while others release HF in smaller quantities and even retard PVDF decomposition. The study proposed an interplay dynamic where surface interactions both lower the onset of HF release and engage exothermically with HF gas subsequently. Additionally, a symmetrical sandwich structure of PVDF and polycarbonate (PC) was prepared, which effectively avoided premature breakdown of PVDF under high-temperature conditions. Furthermore, a controlled high-temperature calcination of PVDF was performed to synthesize carbon quantum dots (CQDs) with an average size of ~2.6 nm. Finally, a crosslinked PVDF/PMMA film was obtained by blending PVDF with polymethyl methacrylate (PMMA) and using a crosslinking agent, which improved the temperature stability of the material.

Chain scission and crosslinking of polyethylene?4 answersPolyethylene can undergo both chain scission and crosslinking reactions. The extent of these reactions depends on various factors such as processing conditions, molecular weight, and the presence of stabilizers. When the processing conditions promote limited mobility of the macromolecular chains, branching is favored over chain scission. However, increasing the mobility of the chains leads to a higher importance of chain scission. Crosslinking does not occur in either case. Crosslinking of polyethylene can be achieved through methods such as introducing silane, peroxide, and a crosslinking catalyst into an extruder, or by introducing water into the extruder. Thermal degradation of polyethylene can also lead to chain scission and crosslinking reactions, resulting in changes in the microstructure and mechanical properties of the polymer. Gamma radiation can induce crosslinking in polyethylene, with the extent of crosslinking and chain scission depending on the temperature. Grafting hexafluoroisopropanol groups onto polyethylene can also result in partial crosslinking.

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