Effects of Thioether Content on the Solubility and Thermal Properties of Aromatic Polyesters

Abstract

Two kinds of aromatic polyesters containing thioether units had been prepared through the reaction of 4,4′-thiodibenzoyl chloride (T-DC) (or 4,4′-bis(4-chloroformylphenylthio)benzene (BPBDC)) and 1,1-bis(4-hydroxyphenyl)-1-phenylethane (BHPPE) by the method of interfacial polycondensation. These polyesters showed good solubility, and could afford tough films with tensile strengths of 103.6–108.3 MPa. The glass transition temperature (T g) of these polyesters ranged from 189.8 to 235.6 °C and initial degradation temperatures (T d) were 450–454 °C. The activation energies of degradation were in range of 156.6–160.3 KJ/mol. The limiting oxygen indexes (LOIs) of these polyesters ranged from 37 to 39, and UL-94 V-0 rating could achieve via this approach. The thermal degradation kinetics and thermal pyrolysis mechanism of these polyesters was studied by thermogravimetric analysis and Py-GC/MS analysis, respectively.

High‐performance soluble copolyarylate based on phenolphthalein: synthesis, characterization and properties

“…The PARs based on bisphenol A (BPA) are some of the primary PARs that are currently commercially available, as well as excellent candidates for versatile polymers in many different applications . Nevertheless, these polymers have poor solubility in common organic solvents and have a relatively low glass transition temperature ( T g ) at approximately 190 °C, thus posing challenges for their widespread applications . Numerous efforts, such as introducing asymmetric units, non‐coplanar units and bulky pendent groups along the polymer backbone, have been made to improve the solubility and enhance the thermal properties of these PARs.…”

“…[5][6][7][8] Nevertheless, these polymers have poor solubility in common organic solvents and have a relatively low glass transition temperature (T g ) at approximately 190 ∘ C, thus posing challenges for their widespread applications. 9,10 Numerous efforts, such as introducing asymmetric units, 11 non-coplanar units 12 and bulky pendent groups [13][14][15] along the polymer backbone, have been made to improve the solubility and enhance the thermal properties of these PARs.…”

High-solubility aromatic polyesters with fluorene and phthalein groups: Synthesis and property

“…Significant effort has been made to improve these properties via the introduction of bulky side groups, flexible chains, and/ or nonsymmetrical groups into the polymer backbones. [9][10][11] Among them, the introduction of cardo groups 12 into the polymeric chain yields well-soluble polymers with better thermal stabilities and mechanical properties. 13,14 Various cardo groups have been introduced into aromatic polyesters.…”

Semiaromatic polyamide poly(hexamethylene terephthalamide)‐co‐polycaprolactam: Thermal and flame‐retardant properties

“…However, only a few semiaromatic polyamides, such as poly(nonamethylene terephthalamide), poly(decamethylene terephthalamide), and copolymer poly(hexamethylene terephthalamide)‐ co ‐poly(hexamethylene hexanediamide) (PA6T/66) and poly(hexamethylene terephthalamide)‐ co ‐polycaprolactam (PA6T/6) copolymers, are commercial and processable because it is difficult to account for their thermal performance and processability simultaneously. In our previous study, we introduced aliphatic linkages or thioether units into the semiaromatic polyamide main chain as flexible segments to improve its processability . As we know, it is important to maintain a balance between the processability and the thermal and mechanical performance; this has been deeply studied over the last 2 decades .…”