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在非水溶液中进行有机碱或有机酸的测定时,都可应用热滴定法(Thermometric Titrimetry),并以离子聚合作用(Ionic Polymerisation)指示终点。作用原理:测定有机碱时,可用高氯酸或三氟化硼作为滴定剂,并以α-甲基苯乙烯(α-Methylstyrene)或异丁基乙烯醚(Isobutyl vinylether)作为单体。当中和反应完成后,极少量过量的滴定剂即可作为催化剂而引起单体发生离子聚合作用(放热反应),因之使被测溶液的温度骤然升高从而指示终点。同理,在测定有机酸时,可用氢氧化四正丁基铵、正丁基锂或氢氧化钾作为催化滴定剂,而以丙烯腈(Acrylonitrile)、丙烯酸甲酯
Thermometric Titrimetry can be used in the determination of organic bases or organic acids in non-aqueous solutions and the endpoint is indicated by Ionic Polymerisation. Principle of action: For the determination of organic bases, use perchloric acid or boron trifluoride as a titrant and α-methylstyrene or Isobutyl vinylether as the monomer. When the neutralization reaction is complete, a very small excess of titrant can act as a catalyst causing the monomer to undergo ionic polymerization (exothermic reaction), causing the temperature of the solution being measured to rise abruptly to indicate the end point. Similarly, in the determination of organic acids, you can use tetra-n-butyl ammonium hydroxide, n-butyllithium or potassium hydroxide as a catalytic titrant, and acrylonitrile (Acrylonitrile), methyl acrylate