Novel poly(aryl ether ketone)s exhibiting liquid crystallinity

Homoepitaxial Crystallization in Films of a Thermotropic Liquid Crystalline Chloro-Poly(aryl ether ketone)

“…[8,9] A specific banded structure is formed through crystallization from the isotropic melt at the temperature range of 330-320 8C, in which the highly ordered smectic crystalline phase is formed. Figure 1 is a bright-field electron micrograph of the thin films, heat treated at 320 8C for 90 min and then quenched to room temperature.…”

“…[8] The formula of the copolymer is as follows, Full Paper: The homoepitaxial crystallization in the films of a thermotropic liquid crystalline chloro-poly(aryl ether ketone) is studied by transmission electron microscopy (TEM) and electron diffraction (ED). The homoepitaxy takes place in the temperature range 330-320 8C, in which a highly ordered smectic crystalline phase of the copolymer with a single-crystal-like banded structure is formed during the cooling process from the isotropic melt.…”

Formation of a metastable phase induced by a liquid crystalline phase in a novel chloropoly(aryl ether ketone)

“…The copolymer can form a highly ordered smectic phase in the liquid crystalline transition temperature on cooling from the isotropic melt. [13] When the cooling rate is low, the highly ordered smectic phase is formed perfectly first and then directly transformed into the form I structure. This transformation is so fast that it is close to thermodynamic equilibrium.…”

“…Both nematic stucture and smectic phases have been observed in these materials. In our previous work, [11][12][13][14][15][16] we have described the synthesis and liquid crystalline behavior of novel poly(aryl ether ketone)s. They exhibit complicated phase behavior and abundant liquid crystalline textures. Crystal-to-liquid crystal and liquid crystal-to-isotropic transitions both appear in the DSC thermograms.…”

Fabrication of Aromatic‐Aliphatic Aminoketone Polymers with Terminal Fluorine Groups

“…[9] Oligomeric or polymeric building blocks for the target molecules should be readily available via the nucleophilic aromatic substitution reaction [9][10][11][12][13][14][15] of secondary aliphatic diamines with 4,4 0 -difluorobenzophenone (DFB). This simple method would be in analogy to the well-established syntheses of poly(ether ketone)s (PEK) [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33] or poly(ether sulfone)s (PES) [34][35][36][37][38] , both based on DFB (Scheme 1). Surprisingly, no reports on the target PAK were available in spite of the fact that related synthetic routes are known, e.g., to produce N-substituted Michler's Ketone derivatives.…”