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Related Experiment Videos

Colored charge-transfer complexes from N,N-dimethyl-p-toluidine.

H Argentar, R L Bowen

    Journal of Dental Research
    |May 1, 1975
    PubMed
    Summary

    Colorless methacrylate monomers react with N,N-dimethyl-p-toluidine (DMPT) to form yellow mixtures. Ultraviolet spectroscopy revealed interactions causing this undesired color, leading to predictive equations for formulation development.

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    Area of Science:

    • Polymer Chemistry
    • Organic Chemistry

    Background:

    • Methacrylate monomers are widely used in polymer synthesis.
    • N,N-dimethyl-p-toluidine (DMPT) is a common amine accelerator in polymerization processes.
    • Undesired color formation can compromise the aesthetic and functional properties of final polymer products.

    Purpose of the Study:

    • To investigate the cause of yellow color formation when DMPT is mixed with specific methacrylate monomers.
    • To understand the chemical interactions responsible for color development.
    • To develop predictive models for color formation in formulations.

    Main Methods:

    • Mixing DMPT with methacrylate monomers containing phthalate, isophthalate, or terephthalate diester groups.
    • Utilizing ultraviolet (UV) spectroscopy to analyze the interactions.
    • Deriving mathematical equations based on spectroscopic data.

    Main Results:

    • The addition of DMPT to methacrylate monomers resulted in the formation of distinct yellow mixtures.
    • UV spectroscopy confirmed chemical interactions between DMPT and the diester groups of the monomers.
    • Predictive equations were successfully derived to correlate formulation components with color generation.

    Conclusions:

    • The interaction between DMPT and phthalate, isophthalate, or terephthalate diester groups in methacrylate monomers is the primary cause of yellow color.
    • UV spectroscopy is an effective tool for elucidating these color-causing interactions.
    • The derived equations can guide formulation adjustments to prevent unwanted color in methacrylate-based systems.

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