Synthesis of Amorphous Polyaryletherketone Containing Phthalein and Fluorene as Side Groups

Abstract

A series of linear high molecular weight amorphous polyaryletherketone (paek) copolymers with phthalein and fluorene side groups was synthesized on the basis of the polyetherketone with phthalein cardo group (pek-c). the structures were characterized by ftir, h-1 nmr, c-13 nmr. gel permeation chromatography(gpc) data indicated that the (m) over bar (n) and the (m) over bar (w) of the copolymer were higher than 6. 0 x10(4) and 1. 0 x10(5), respectively, with a polydisperity index(pdi) ranging from 1. 6 to 1. 7. the x-ray diffraction(xrd) data revealed that the copolymers were amorphous structure. thermogravimetric analysis(tga) and differential scanning calorimetry(dsc) tests showed that the copolymers exhibited good heat resistant property. the onset temperature of mass loss was higher than 467 degrees c. the char yield at 700 degrees c was more than 58. 9%. there was a single glass transition temperature(t-g), with t-g>243 degrees c. the elastic modulus and elongation at break of the copolymer showed a significant increase, up to 3. 1 gpa and 58%, respectively, which were 1. 4 folds and 8. 3 folds compared to that of pek-c when the feed ratio of phenolphthalein and 9,9-bis(4-hydroxyphenyl) fluorene was between 3 : 7 and 5 : 5. amorphous polyaryletherketone containing phthalein and fluorene as side groups kept good solubility in chloroform, dichloromethane, tetrahydrofuran (thf), n-methyl-2-pyrrolidone (nmp) and other aprotic solvents. the mechanical and thermal properties were improved significantly.