Acta Phys. -Chim. Sin. ›› 1997, Vol. 13 ›› Issue (01): 64-67.doi: 10.3866/PKU.WHXB19970113

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Determination of Terminal OH Groups in Polymers by Differential Direct Injection Enthalpimetry

Zhou Xu-Zhang,Chen Jing-Wei,Shan Fu   

  1. Department of Chemistry,Institute of Technology,Changsha 410073
  • Received:1996-05-20 Revised:1996-09-06 Published:1997-01-15
  • Contact: Zhou Xu-Zhang


A thermometric method in which the heat of reaction is used as a quantitative measure of terminal OH groups in polymers has been in routine use. We use DDIE to determine the terminal OH groups in polyglycol and telechelic polybutadienes by the acetylation reaction of perchloric acid with acetic anhydride. The result is in good agreement with that of chemical titration, thus showing high reliability of DDIE in polymer end-group determination.
The method takes less than 5 minutes to carry out. The advantages of DDIE are simplicity, speed and also a repeatability is good.

Key words: Differential direct injection enthalpimetry(DDIE), Polymer terminal-group determination