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Related Experiment Videos

Polymerization shrinkage of methacrylate esters.

M P Patel, M Braden, K W Davy

    Biomaterials
    |January 1, 1987
    PubMed
    Summary

    Polymerization shrinkage in methacrylate polymers decreases with larger side groups. This property can determine polymer conversion, with a constant molar volume change of 22 cc/mol.

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    Area of Science:

    • Polymer Chemistry
    • Materials Science

    Background:

    • Polymerization shrinkage is a critical factor in polymer performance and processing.
    • Understanding factors influencing shrinkage is essential for developing advanced polymeric materials.

    Purpose of the Study:

    • To investigate the relationship between side group structure and polymerization shrinkage in various methacrylate polymers.
    • To explore the potential of polymerization shrinkage as a method for determining the degree of polymer conversion.

    Main Methods:

    • Densitometry was employed to measure the volume shrinkage of poly(n-alkyl methacrylates) with side chains from C1 to C16.
    • The study included isomers and polymers of cyclic and heterocyclic methacrylates.

    Main Results:

    • Percentage volume shrinkage decreased as the size of the substituent side group increased.
    • A constant change in molar volume (22 cc/mol) was observed during polymerization, independent of side group geometry.
    • Glass transition temperature was highly dependent on side group geometry.

    Conclusions:

    • Polymerization shrinkage is inversely related to side group size in methacrylate polymers.
    • Methacrylate esters with large molar volumes and side groups promoting high glass transition temperatures are promising for low-shrinkage glassy polymers.
    • The consistent molar volume change of 22 cc/mol allows for the determination of polymer conversion.

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