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Information × Registration Number 0201U003031, 0198U001265 , R & D reports Title Synthesis and physical characterization of novel semi-rigid chain polymers of the family of polyheteroarylenes capable of mesophase formation popup.stage_title Head Pryvalko V.P., Registration Date 25-01-2001 Organization Institute of Macromolecular Chemistry NASU popup.description2 Novel film- and fiber-forming polymer materials of the family of polyheteroarylenes exhibited improved thermomechanical, dielectric and gas-separating properties due to incorporation of mesogenic fragmennts into chain repeating units. Target-oriented design of chain repeating units of poly(amide imide)s (PAI) by changing the number of molecular "swivels" permitted to control the degree of intersegmental association in solution, as well as to significantly increase the upper temperature limit of the service interval (up to 570-650 K) and to improve both the gas-separating characteristics (selectivity as high as 100 for the mixture methane/carbon dioxide) and the dielectric properties (maximum increase of the dielectric permittivity below 1,5 in the temperature interval 170-470 K). The developed PAIs can be recommended for use in chemical industry as highly efficient membrane materials for gas separation, and in tre industry of electronic devices as high temperature dielectrics. Product Description popup.authors popup.nrat_date 2020-04-02 Close