Mechanical properties of a hydrophilic acrylic polymer | Zendy

O'Brien W. J. | Zendy; Hermann J. | Zendy; Shepherd T. H. | Zendy

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Mechanical properties of a hydrophilic acrylic polymer

Author(s) -

O'Brien W. J.,

Hermann J.,

Shepherd T. H.

Publication year - 1972

Publication title -

journal of biomedical materials research

Language(s) - English

Resource type - Journals

eISSN - 1097-4636

pISSN - 0021-9304

DOI - 10.1002/jbm.820060204

Subject(s) - materials science , polymer , swelling , composite material , acrylic resin , immersion (mathematics) , absorption of water , dentures , elastic modulus , modulus , polymer chemistry , dentistry , medicine , mathematics , pure mathematics , coating

Acrylic polymers with hydrophilic groups (i.e., ethyl hydroxyl) may be prepared that convert to a soft elastic gel by absorbing water. Such a polymer has been applied to dentistry for use as an elastic lining material for dentures. A commercial product, Hydron, was used in this study. The linear expansion of this material after 520 hr of water immersion was found to be 20.4%. Hardness was found to decrease from 15.7 KHN for the dry polymer to 1.5 KHN at 19% absorbed water content. The swelling pressure was measured and found to reach a maximum value of 157 psi after 204 hr of water immersion. The Young's modulus was found to decrease from a value of 295,300 psi to 290 psi with 19% absorbed water content. Values were determined on intermediate water contents for the properties studied.

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