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

Abstract

A series of aromatic polyesters bearing fluorene and phthalein groups were synthesized from commercially available 9,9-bis(4-hydroxyphenyl)fluorene (BPF), phenolphthalein, and terephthaloyl chloride through an interfacial polymerization method. The microstructure, molecular weight, morphology, thermal properties, and thermal decomposition mechanism of these aromatic polyesters were investigated. Their mechanical properties were also evaluated. The results suggested that the copolymer compositions were approximately equal to the feed compositions. Moreover, the increase in the BPF unit content increased the glass transition and weight loss temperatures of the aromatic polyesters, owing to the strong rigidity of the bulky fluorene group. All the polymers were amorphous and exhibited good solubility in common organic solvents. Hence, the synthesized polymers could be easily cast into flexible films. The copolymer film samples exhibited better mechanical properties than those of the homopolymers. The tensile strength, Young’s modulus, and elongation at break of the polymers first increased gradually, and then decreased with increasing BPF content. Notably, the copolymers exhibited the best mechanical properties at the BPF content range 30–50%. Owing to their characteristics, these synthesized polymers show great potential for application as high performance membrane materials.

Synthesis of aromatic polyesters derived from bisphenol‐A and bis(hydroxyphenyl)butane with diacyl chloride monomers

“…T max was reduced by less than 10°C as the bis(hydroxyphenyl)butane molar content in polymertization feed ration was raised (Figure 4b). This can be explained by the introduction of side ethyl groups, which reduce the rigidity of the main chain of the copolyester and lead to a decrease in heat resistance 12,21,30–32 . However, the decrease in T max is small, indicating that the side ethyl unit has a slightly lower effect on T max .…”

Synthesis and properties of copolyarylates containing phenol red units

“…Meanwhile, as the PR content in the co‐PARs gradually increased, the carbon residue rate at 800°C also increased. This can be explained by the fact that PR units provide more aromatic structure for the polyarylate chain, which increase the carbon residue ratio 2,29,30 …”

Synthesis and properties of novel block-structured polyarylates containing fluorene: a two-step interface polymerization

“…Finally, the reaction product was poured into methanol to precipitate and filtered, dissolved and precipitated twice in DCM and methanol, and dried for 12 hours to give a white polymer. 6,13…”

“…A variety of PAR materials with different characteristics have been developed for specific situations. 6,7 For instance, PAR materials with high-temperature resistance and good thermal stability can be used in high-temperature environments, 8 while those with low dielectric constant and dielectric loss can be used as circuit dielectric materials, 9 and high transparency PAR materials can be utilized in flexible organic light-emitting diodes (OLEDs). 10 Various strategies have been proposed to modify polyarylates, primarily through molecular structure design modification and blending.…”