Reversible derivatization of poly (aryl ether ketones)

C - Chemistry – Metallurgy – 08 – G

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C08G 65/48 (2006.01) C08J 5/24 (2006.01)

Patent

CA 2687828

The embodiments of the present disclosure present systems and methods for the reversible solubilization of (aryl ether ketones) (PAEKs). A thioacetalization process is employed to modify the PAEKs into poly (aryl ether thioacetals) which, unlike PAEKs, are substantially soluble in common solvents. This modification allowing selected analysis techniques to be more easily performed on PAEKs1 such as gel permeation chromatography. The thioacetalization may be reversed through a deprotection reaction to recover the original PAEK without substantial degradation, allowing for non-destructive characterization of the PAEK. Advantageously, the thioacetalization process is generally applicable to a broad range of PAEKs, unlike presently known methods of solubilizing PAEKs. Solubilization of PAEKs further expands the utility of the PAEKs, opening up additional routes to chemical modification of PAEKs, as well as allowing for the possibility of processing PAEKs from solution.

La présente invention concerne des systèmes et procédés pour la solubilisation réversible d'(aryl éther cétones) (PAEK). Un procédé de thioacétalisation est employé pour modifier les PAEK en poly(aryl éther thioacétals) qui, contrairement aux PAEK, sont sensiblement solubles dans les solvants courants. Cette modification permet de réaliser facilement des techniques d'analyse sélectionnées sur des PAEK telles que la chromatographie par perméation de gel. La thioacétalisation peut être inversée par une réaction de déprotection pour récupérer le PAEK d'origine sans dégradation substantielle, permettant la caractérisation non destructrice du PAEK. De façon avantageuse, le procédé de thioacétalisation s'applique de façon générale à une large gamme de PAEK, contrairement aux procédés présentement connus de solubilisation de PAEK. La solubilisation des PAEK étend encore l'utilité des PAEK, ouvrant des voies supplémentaires à la modification chimique des PAEK tout en permettant également la possibilité de traiter les PAEK à partir d'une solution.

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