Synthesis and Properties of Aromatic Polyesters Whith Carded Fragments

Abstract

Polyethers are of great interest for various industries due to a complex of valuable properties, such as heat resistance, fire resistance, high strength, etc. Carded polymers occupy a special place among polymers with increased heat resistance, containing in the main polymer chain at least one element that is part of the lateral cyclic grouping. The presence of such fragments increases the glass transition temperature and heat resistance, which allows the copolymers to be operated at higher temperatures without changing the physico-mechanical parameters. For crystalline polymers, the presence of cardo fragments leads to better solubility in organic solvents. One of the promising ways of synthesizing heat-resistant polymeric materials is based on the use of aromatic compounds such as 3,3-bis (4'-hydroxyphenyl) phthalide, 3-chloro-3- (diphenyloxyd-4'-yl) phthalide, 3- chloro-3- (diphenylsulfide-4'-yl) phthalide, 9,9-bis (4'-hydroxyphenyl) fluorene, 9,9-bis (4'-hydroxyphenyl) anthrone-10, 2-phenyl-3,3- Bis (4'-hydroxyphenyl) phthalimidine and the like. At present, the worldwide problem of the release of toxic waste into the environment is aggravated, which causes irreversible climatic changes. To solve this problem, it was proposed to develop solid fuel cells based on polymeric proton-exchange membranes. Thus, polymer membranes must satisfy a number of requirements: to provide minimal ohmic losses, to possess considerable proton conductivity, mechanical strength, thermal stability and to have limited solubility in organic solvents. Polymer membranes with carded fragments in the main chain satisfy all the requirements. In the presented review features of synthesis and properties of copolymers on the basis of polysulfones, polyether ketones, polyetherimides with carded fragments are considered.Forcitation:Shakhmurzova K.T., Kurdanova Zh.I., Zhansitov A.A., Baiykaziev A.E., Khashirova S.Yu., Pakhomov S.I., Ligidov M.Kh.Synthesis and properties of aromatic polyesters whith carded fragments. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 6. P. 28-39.

Design of the SLS-machine for PEEK

“…In Figure 11, the 3D test samples synthesized by us are shown; they have complex forms of various air nozzles with cooling channels. The material of the 3D samples was PEEK, courtesy of the manufacturer (Kabardino-Balkarian State University [48,49]). The next technological regime was used for the successful fabrication of parts ( Figure 11): the platform heaters and the walls of the changeable frame are set to a temperature of 360°C; the layer is preheated up to 385°C; after 2 s, laser sintering begins (with upper heaters being cooled); CO 2 laser radiation power was 12W; the laser beam diameter was 300 μm; the scanning speed was 2000 mm/s; the thickness of the delivered layer of the powder was 120 μm; and the hatching step was 250 μm.…”

The Setup Design for Selective Laser Sintering of High-Temperature Polymer Materials with the Alignment Control System of Layer Deposition

“…In Figure 11, the 3D test samples synthesized by us are shown; they have complex forms of various air nozzles with cooling channels. The material of the 3D samples was PEEK, courtesy of the manufacturer (Kabardino-Balkarian State University [48,49]). The next technological regime was used for the successful fabrication of parts (Figure 11): the platform heaters and the walls of the changeable frame are set to a temperature of 360 °C; the layer is preheated up to 385 °C; after 2 s, laser sintering begins (with upper heaters being cooled); CO2 laser radiation power was 12 W; the laser beam diameter was 300 μm; the scanning speed was The correctness of the installation design is indirectly confirmed by the movement accuracy measured in node 4 (lower transition table, Figures 3 and 8), which determines the vertical movement accuracy of node 5 (the building platform) through the system of rigid clamps.…”

The Effect of PEEK Drying Modes on Thermal Stability

“…Unfortunately, it is not produced on an industrial scale in our country. However, in various laboratories, including the laboratory of advanced polymers of H.M. Berbekov Kabardino-Balkarian State University, synthesized experimental batch of PEEK [4][5][6][7][8].…”