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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 chcmical 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.
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 chcmical 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.