Thiopene-Based Polu(arylene ether ketone)s: Thermal and Mechanical Properties ofAmorphous Systems Using Bis(p-Fluorobenzoyl)aryl Monomers

摘要

A series of high molar mass and controlled molar mass poly(aryl ether ketone)swere synthesized based on bis(p-fluoro-benzoyl)aryl monomers and 4,4'-isopropylidenediphenol. The central aromatic unit of the activated bishalide was varied to include 1,4 phenylene, 2,5 thiophene, and 1,3 phenylene to systematically change the exocyclic bond angle from 180 deg to 148 deg to 120 deg, respectively. The thermal, dynamic mechanical and mechanical properties of the three polymers were determined for the controlled molar mass materials. The glass transition temperature of the controlled molar mass 2,5thiophene based polymer was 147 deg C compared to 149 deg C for 1.3-phenylene based polymer and 162 deg C for the 1,4-phenylene based polymer. The thermal stability of poly(BFTh-BisA) was similar to that of poly(1,3-BFB-BisA) and poly(1,4-BFB-BisA). The sub Tg loss dispersions were measured for each of the three polymers. The pronounced g relaxation for poly(BFTb-BisA), poly(1,4-BFB-BisA), and poly(1,3-BFB-BisA), has an activation energy of 7.5, 9.0, and 10 kcal/mol. The activation energy of b dispersion for poly(BFTh-BisA) is 16 kcal/mole. The Young's modulus is 2.9 GPa, 3.1 GPA and 3.6 GPA for poly(1,4-BFB-BisA), poly(2,5-BFTh-BisA) and poly(1,3-BFB-BisA), respectively. Poly(arylene ether ketone),s; PEEK; Thermal Analysis; Dynamic Mechanical Thermal Analysis; Heterocyclic polyethers.