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Tack behavior of coating solutions II.

S K Chopra, R Tawashi

    Journal of Pharmaceutical Sciences
    |April 1, 1984
    PubMed
    Summary

    The tackiness of concentrated polymer solutions, crucial for coatings, depends on internal structure, not just viscosity. Tacky materials exhibit delayed elastic effects, requiring greater force to split films.

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    Area of Science:

    • Polymer Science
    • Materials Science
    • Rheology

    Background:

    • Coating solutions often contain high polymer concentrations.
    • Understanding the tackiness of these solutions is critical for application processes.
    • Viscosity is typically considered a primary factor in liquid film behavior.

    Purpose of the Study:

    • To investigate the tackiness of high-concentration polymer solutions.
    • To explore the film-splitting process kinematics.
    • To determine the factors governing the tackiness of polymer coatings.

    Main Methods:

    • Utilized a parallel plate technique to measure tackiness.
    • Employed a high-speed movie camera to analyze film-splitting kinematics.
    • Examined highly concentrated polymer solutions (semisolids) and dilute solutions.

    Main Results:

    • Film splitting impulse for concentrated polymer solutions is linked to internal structure, not viscosity.
    • Tacky materials demonstrate "delayed elastic effects".
    • Tacky materials require significantly larger impulses for film splitting compared to non-tacky materials.

    Conclusions:

    • The tackiness of concentrated polymer coating solutions is governed by their internal structure and viscoelastic properties.
    • Delayed elastic effects are a key indicator of material tackiness.
    • This research provides insights into the fundamental mechanisms of polymer solution tackiness.

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