Viscoelastic behavior of interpenetrating polymer networks: Poly(ethyl acrylate)–poly(methyl methacrylate)

Abstract

SynopsisThe creep behavior of a series of poly(ethy1 acry1ate)-poly(methy1 methacrylate) interpenetrating polymer networks was investigated. For comparison purposes, soMe stress relaxation data were included. Master curves containing a single broad transitibn covering approximately 20 decades of time were found for midrange compositions. qthough the time-temperature superposition principle and the WLF equation should not strictly apply, reasonable agreement was found over a large portion of shift factor versus temperature plots. Application of a modified Tobolsky-Aklonis-Dupre glass-rubber theory suggested that the breadth of the transition could be attributed to a near continuum of phase compositions in the material, each phase composition making its specific contribution to the relaxation spectrum. Whether or not these phase regions @re so small as to arise from random concentration fluctuations in an otherwise compatible polymer pair remains unknown.

Urethane Coatings

“…They are more or less intimate mixtures of two or more distinct, cross-linked polymer networks held together by permanent entanglements with only accidental covalent bonds between the polymers, for example, they are polymeric "catenanes" (212,213). They are produced either by swelling a cross-linked polymer with monomer and cross-linking agent of another polymer and curing the swollen polymer in situ (209)(210)(211)214) or by blending the linear polymers, prepolymers, or monomers in some liquid forms (latex (207, (217,218), or bulk (219, 220)), together with cross-linking agents, evaporating the vehicle (if any), and curing simultaneously the component polymers.…”

Elastomer Blends

“…The types of elastomer pairs suitable for preparation of IPN's extend beyond polyurethanes plus polyacrylates to polymethacrylates with polyacrylates and/or polystyrene [259,260], or polysiloxane with polystyrene or polymethylmethacrylate [261]. The types of elastomer pairs suitable for preparation of IPN's extend beyond polyurethanes plus polyacrylates to polymethacrylates with polyacrylates and/or polystyrene [259,260], or polysiloxane with polystyrene or polymethylmethacrylate [261].…”

Synthesis, characterization, and anticorrosive coating properties of waterborne interpenetrating polymer network based on epoxy‐acrylic‐oleic acid with butylated melamine formaldehyde

“…To avoid this problem, IPNs are prepared from preformed prepolymers containing complementary functional groups that enhance their miscibility. The maneuverability of the IPNs allow the formulator to manipulate the composition and other factors of the constituent polymers to arrive at tailor made products to suit a specific requirement, which can be considered as a major advantage in the field of coatings 20–22. The main advantages of IPNs are that they are relatively not easily affected by external stresses (which happen to polymer blends where the component polymers are not compatibilized due to simple physical mixing).…”