Linear Poly(ether ketone)s Having Hydroxyl Groups in the Side Chains
We also attempted to synthesized 3,5-bis(4-fluoro-benzoyl)anisole (5), the methyl protected compound of 3, for linear poly(ether ketone)s as in the case of the dendrimers.
Hyperbranched Poly(ether ether ketone) (Hyper-OH)
The mixture was poured into water and treated with hydrochloric acid [,] to form hydroxyl linear poly(ether ketone)s (Linear-OH-BisA and Linear-OH-HQ) having hydroxyl groups in the side chains.
Hydroxylated poly(ether ether ketone) (PEEK-OH) samples, with different degrees of functionalization, have been synthesized by selective carbonyl reduction. The ATR-FTIR and NMR spectra corroborated the reduction success, showing a decrease in the intensity of the peaks related to the ketone group and simultaneously the appearance of new signals associated with the hydroxyl group. TGA curves indicated a reduction in thermal stability with increasing hydroxylation degree (HD), attributed to changes in the spatial organization of the molecules and a less intense resonance effect. DSC experiments showed a progressive diminution in the crystallization and melting temperatures as the number of hydroxyl groups increased due to the restrictions on polymer chain diffusion imposed by the strong hydrogen bonds. Furthermore, the level of crystallinity of the derivatives drastically decreased upon increasing HD, as evidenced from the X-ray diffraction spectra. The random distribution of this functional group inhibits the molecular packing, leading to the formation of smaller and less perfect crystals. DMA studies revealed a decrease in both storage and loss moduli as the extent of modification increased. However, the presence of the hydroxyl group caused a significant improvement in the glass transition temperatures of the polymers, particularly at higher degree of functionalization, where the increment was close to 40 °C. Such enhancement is attributed to a decrease in mobility and flexibility induced by the strong intermolecular interactions between the chains.
Preparation of Poly(ether ketone) Dendrons with Graded Structures.
Poly (Ether Ether Ketone) Market report provides detailed analysis about production, revenue, gross margin, consumption value, consumption volume, sale price, import, export, and forecast to 2022
Orthogonal Synthesis of Poly(aryl ether amide) Dendrons.
High performance poly(arylene ether ketone)s and poly(arylene ether sulfone)s offer attractive chemical, physical, and mechanical properties. Current work seeks to design materials that add to the inherent properties in these polymers resulting in their extension into a wide variety of applications. Our efforts in manipulation of structure/property relationships are focused on replacing phenylene units with their corresponding thiophene analogues. The successful synthesis of high molar mass polymer based on 2,5-bis(p-fluorobenzoyl)thiophene clearly demonstrated the stability of the thiophene containing monomer to usual PAEK reaction conditions. This work in PAEK' was recently extended into thiophene analogues of ICI's PEEK. The utilization of bis(5-chlorothienyl-2)ketone as the activated bishalide monomer takes advantage of the fact that the SNAR mechanism is known to be a more facile reaction in heterocycles avoiding the deleterious SRN1 mechanism which leads to side reactions resulting in low molar mass polymer in most of the less activated phenyl-based systems. As a result, a novel, high molecular weight poly(arylene ether ketone) based on the thiophene analogue of 4,4′-dichlorobenzophenone and 4,4′-isopropylidenediphenol was synthesized using a new step growth polymerization methodology where the polymer forming step is the formation of the phenyl-thienyl ether linkage. Herein, we describe the extension of this synthetic methodology into asymmetric monomer systems to form poly(arylene ether ketone)s. In addition, we describe the polymerization of novel thiophene-containing poly(arylene ether sulfone)s using this same reaction methodology.
Polyether ether ketone - Wikipedia
N2 - The Friedel-Crafts polymerization of 2,5-thiophenedicarbonyl dichloride and diphenyl ether in 1,2-dichloroethane afforded only low molecular weight of poly(ether ketone) containing thiophene-ring. In contrast to this, the polymerization in 1-butyl-3-methylimidazolium chloride-aluminum chloride mixture gave high molecular weight polymers. The polymerization in ionic liquid was a new approach to expand possibility of polymer synthesis such as preparation of polymer containing heterocyclic rings. The obtained poly(ether ketone) exhibited good thermal stability and chemical resistance comparable to common poly(ether ketone)s.