Exchange Reactions of Poly(arylene ether ketone) Dithioketals with Aliphatic Diols: Formation and Deprotection of Poly(arylene ether ketal)s

Manolakis, Ioannis; Cross, Paul; Colquhoun, Howard M.

doi:10.1021/acs.macromol.7b02203

Cited by 15 publications

(22 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Synthesis of PEEK-1,3-dioxolane (Scheme S2, Supporting Information): PEEK-1,3-dioxolane was synthesized by a two-step reaction referring to the method in the literature. [28,34] PEEK (14.4 g, 0.05 mol) with different melt index were dissolved in dichloromethane (240 mL) with trifluoroacetic acid (60 mL) as cosolvent under nitrogen, the purified system was isolated from the atmosphere using a nitrogen package. Added 1,2-ethanedithiol (10.48 mL, 0.125 mol) and boron trifluoride diethyl etherate (15.78 mL, 0.125 mol) sequentially to the obtained cloudy yellow solution using a syringe, this would cause the solution to turn dark red.…”

Section: Methodsmentioning

confidence: 99%

Strong Interface Construction of Carbon Fiber–reinforced PEEK Composites: An Efficient Method for Modifying Carbon Fiber with Crystalline PEEK

Yang

Wang

et al. 2020

Macromol. Rapid Commun.

View full text Add to dashboard Cite

In order to improve the poor solvent resistance and poor temperature resistance caused by traditional sizing agents, crystalline poly(ether ether ketone) (PEEK) is introduced to the interfacial phases of carbon fiber (CF) reinforced PEEK composites by a soluble precursor named PEEK‐1,3‐dioxolane. By changing the soluble precursor molecular weight and concentration in the sizing solution, the content of PEEK coated on the CF fiber surface can be controlled and the different interfacial properties of the PEEK composites can be obtained. The results shows that, with this method, crystalline PEEK can be completely coated on the CF surface, and the interfacial shear strength of the PEEK composites increases from 43.42 to 83.13 MPa. Due to none of any soluble compounds in the PEEK composites, the interfacial layer is well preserved under organic solvents and hygrothermal conditions, and the interfacial shear strength (IFSS) of the PEEK composites maintained above 85.4% and 90.44%, respectively. Scanning electron microscope clarifies that the mechanism of interface enhancement comes from a better wetting of crystalline PEEK on the fiber surface. Additionally, the sizing system of this investagation has the potential commercial value because of no toxic reagent (such as 2,4,5‐trichloro‐1‐hydroxy‐benzene or concentrated sulfuric acid) is required during sizing.

show abstract

Section: Methodsmentioning

confidence: 99%

Strong Interface Construction of Carbon Fiber–reinforced PEEK Composites: An Efficient Method for Modifying Carbon Fiber with Crystalline PEEK

Yang

Wang

et al. 2020

Macromol. Rapid Commun.

View full text Add to dashboard Cite

show abstract

“…Synthesis procedures , of soluble PEEK are shown in Scheme , and the specific procedures of PEEK and sPEEK are listed in the Supporting Information.…”

Section: Methodsmentioning

confidence: 99%

Reinforced Poly(ether ether ketone)/Nafion Composite Membrane with Highly Improved Proton Conductivity for High Concentration Direct Methanol Fuel Cells

Zhang

Yue

Luan

et al. 2020

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

The composite membranes that combine pore-filling with a matrix having precisely assembled sulfonated groups are designed here for use in the applications of direct methanol fuel cells. A porous crystalline poly(ether ether ketone)/sulfonated poly(ether ether ketone) blended matrix with continuous pore structures is first fabricated using a phase inversion process. Solvent treatment of the porous matrix is then employed to induce the enrichment of sulfonated groups at the pore surfaces, based on the interaction between the solvent and functional groups in polymer chains. This strategy effectively shortens the proton transport path, accelerating the proton transfer rate. The pores of the matrix are then filled with Nafion ionomers, resulting in a reinforced composite membrane consisting of interconnected hydrophilic domains in a fuel-insulating rigid matrix. A single cell made using the novel composite membrane exhibits a relatively high power density of 91.7 mW/cm2 and an open circuit voltage of 0.67 V at 70 °C using 10 M methanol, significantly higher than a test device made using Nafion 117. This work supplies a simple and highly efficient strategy to address the low proton conductivity that is normally seen in composite membranes made using pore-filling technology.

show abstract

“…1 H-NMR (500 MHz, DMSO-d 6 ) δ ppm 7.1 (br s, 2H), 6.5 (br s, 2H), 2.0-1.2 (br peak, 2H), 1.4-0.9 (br peak, 3H). 13 (d) Synthesis of Anilinated-PEEK (AN-PEEK): The synthesis was accomplished according to a previously reported protocol [34]. In a typical reaction, 1.0 g of PEEK was transferred into a mixture of anhydrous dichloromethane (40 mL) and trifluoroacetic acid (4 mL) and probe sonicated for 45 min to form a homogeneous solution.…”

Section: Synthesis Of Key Building Blocksmentioning

confidence: 99%

Carbon Nano-Onions Reinforced Multilayered Thin Film System for Stimuli-Responsive Drug Release

et al. 2020

View full text Add to dashboard Cite

Herein, poly (N-(4-aminophenyl) methacrylamide))-carbon nano-onions (PAPMA-CNOs = f-CNOs) and anilinated-poly (ether ether ketone) (AN-PEEK) have synthesized, and AN-PEEK/f-CNOs composite thin films were primed via layer-by-layer (LbL) self-assembly for stimuli-responsive drug release. The obtained thin films exhibited pH-responsive drug release in a controlled manner; pH 4.5 = 99.2% and pH 6.5 = 59.3% of doxorubicin (DOX) release was observed over 15 days. Supramolecular π-π stacking interactions between f-CNOs and DOX played a critical role in controlling drug release from thin films. Cell viability was studied with human osteoblast cells and augmented viability was perceived. Moreover, the thin films presented 891.4 ± 8.2 MPa of the tensile strength (σult), 43.2 ± 1.1 GPa of Young’s modulus (E), and 164.5 ± 1.7 Jg−1 of toughness (K). Quantitative scrutiny revealed that the well-ordered aligned nanofibers provide critical interphase, and this could be responsible for augmented tensile properties. Nonetheless, a pH-responsive and mechanically robust biocompatible thin-film system may show potential applications in the biomedical field.

show abstract

Exchange Reactions of Poly(arylene ether ketone) Dithioketals with Aliphatic Diols: Formation and Deprotection of Poly(arylene ether ketal)s

Cited by 15 publications

References 23 publications

Strong Interface Construction of Carbon Fiber–reinforced PEEK Composites: An Efficient Method for Modifying Carbon Fiber with Crystalline PEEK

Strong Interface Construction of Carbon Fiber–reinforced PEEK Composites: An Efficient Method for Modifying Carbon Fiber with Crystalline PEEK

Reinforced Poly(ether ether ketone)/Nafion Composite Membrane with Highly Improved Proton Conductivity for High Concentration Direct Methanol Fuel Cells

Carbon Nano-Onions Reinforced Multilayered Thin Film System for Stimuli-Responsive Drug Release

Contact Info

Product

Resources

About