Colorimetric Analysis of Organic Hydroxyl Groups

A fast and specific method has been developed for the determination of hydroxyl content in prepolymers that contain hydroxymethylene functional groups. This method involves reaction of the sample with either trifluoroacetic anhydride or hexafluoroacetone to separate the terminal oxymethylene signals in the 'H NMR spectrum from those of the repeating unit and integration against an internal trinitrobenzene standard. This procedure generally requires less than 50 mg of polymer and has been employed in the analysis of prepolymers with number average molecular weights ranging up to 10000. The analysis has been tested using several different prepolymers. Precision of analysis was determined to be within 2.7 percent using a Varian XL-200 spectrometer. ACKNOWLEDGMENT

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Synthesis of pH-responsive and adhesive super-absorbent hydrogel through bulk polymerization

Shin

Kim

Chung

2013

Macromol. Res.

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Colorimetric Analysis of Organic Hydroxyl Groups

Cited by 5 publications

References 10 publications

Constituents from Gymnema sylvestre Leaves VIII: Isolation, Chemistry, and Derivatives of Gymnemagenin and Gymnestrogenin

Constituents from Gymnema sylvestre Leaves VIII: Isolation, Chemistry, and Derivatives of Gymnemagenin and Gymnestrogenin

Hydroxyl group determination in prepolymers by ¹H NMR spectroscopy

Synthesis of pH-responsive and adhesive super-absorbent hydrogel through bulk polymerization

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Colorimetric Analysis of Organic Hydroxyl Groups

Cited by 5 publications

References 10 publications

Constituents from Gymnema sylvestre Leaves VIII: Isolation, Chemistry, and Derivatives of Gymnemagenin and Gymnestrogenin

Constituents from Gymnema sylvestre Leaves VIII: Isolation, Chemistry, and Derivatives of Gymnemagenin and Gymnestrogenin

Hydroxyl group determination in prepolymers by 1H NMR spectroscopy

Synthesis of pH-responsive and adhesive super-absorbent hydrogel through bulk polymerization

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Hydroxyl group determination in prepolymers by ¹H NMR spectroscopy