Interpenetrating Polymer Network as DDS

An interpenetrating polymer network, IPN, is a combination of two polymers in network form, at least one of which is synthesized and/or cross-linked in the immediate presence of the other. An IPN is distinguished from other multi polymer combinations, such as polymer blends, blocks, and grafts, in two ways: (1) an IPN swells, but does not dissolve in solvents; and (2) creep and flow are suppressed. interpenetrating polymer networks having ionic or covalent bond between the interpenetrating networks are prepared from a first and a second polymer network, at least one of which contains an EPRXE resin, a resin having two epoxide functionalities represented by E and a reactive pendant nonepoxide functionality X. The two resin networks are sequentially cross-linked followed by activation of the pendant functionality of the EPRXE resin to form internetwork links between the two resin networks affording an epoxy resin with both increased strength and toughness. The invention is also directed to the process of making EPRXE resins where the pendant functionalities are primary, secondary, or tertiary amines, protected amino, or protected carboxyl groups.

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