Synthesis and properties of lyotropic liquid crystalline copolyamides containing phthalazinone moiety and ether linkages

Soluble copoly(aryl ether ether ketone ketone)s containing xanthene and hexafluoroisopropylidene moieties

“…In contrast, the present fluorinated PEEKK copolymers were soluble at room temperature in aprotic polar solvents such as NMP, DMF and N,N-dimethylacetamide (DMAc) as well as in the less polar solvents like chloroform and tetrahydrofuran. Obviously, the good solubility of the copolymers could be attributed to the combined effects of the bulky xanthene pendant groups, trifluoromethyl substituents and flexible ether linkages in the polymer backbones, which prevented close chain-packing and allowed the solvent molecules to diffuse easily into the polymer chains [28]. The excellent solubility of these fluorinated PEEKK copolymers makes them easier for film preparation by spin-coating, and it also shows the potential for further device fabrication.…”

Preparation, characterization and application of a novel thermal stable composite nanofiltration membrane

“…A novel polymeric material, poly(phthalazinone ether amide) (PPEA), was previously synthesized in our laboratory [23][24][25]. It has shown superior comprehensive properties including outstanding thermal stability, and the glass transition temperature is higher than 300 • C. Recently, ultrafiltration (UF) membranes have been successfully prepared by phase-inversion method using PPEA as membrane material.…”

Synthesis and Thermotropic Liquid Crystalline Behavior of Novel Main-Chain Poly(aryl ether ketones) Copolymer Containing Phthalazinone Moiety and Biphenyl Mesogen

“…and many kinds of materials bearing phthalazinone were accomplished, such as PPEK, PPES, PPEKK, PPESK, PA, PI et al [2][3][4][5][6][7][8][9][10][11][12][13] It is well-known that liquid crystalline properties are particularly valuable in the applications of high performance engineering materials. For example, the melt viscosities of thermotropic liquid crystalline polymers (LCPs) possessing an isotropic melt state were significantly lower than structurally similar polymers.…”

“…[17][18][19][20][21][22] Quite recently, a novel kind of lyotropic liquid crystalline poly(aryl ether ketones) copolymer and several kinds of polyamides containging phthalazione structure which possessed nematic lyotropic liquid crystalline properties were firstly described in our works. [9][10][11]13 In the present paper, a novel kind of nematic thermotropic liquid crysatlline poly(aryl ether ketones) copolymer was prepared by a one-step mild solution polycondensation reaction with 4-(4-hydroxyl-phenyl)(2H)-phthalazin-1-one (DHPZ), 4, 4 0 -biphenol (BP) and 1, 4-bis(4-fluorobenzoyl)-benzene (BFBB). The structure and liquid crystalline behaviors of the poly(phthalazinone ether biphenyl ketone ketone) copolymer were also investigated in detail.…”

“…26 And it was also noteworthy that the formation conditions of thermotropic liquid crystalline texture for P-5050 was a little different from other thermotropic liquid crystalline poly(aryl ehter ketones) copolymers was due to the fact that a phthalazinone structure (bulky, twisted and non-coplanar configureation in steric) in the mainchains would hinder the movement and cubmer the regular packing of the mainchanis significantly. 9,12,22 SAXD and WAXD Analysis…”