Sequential Interpenetrating Polymer Networks Synthesized from Polyester Based Polyurethane and Poly(butyl methacrylate)

In this article we review the synthesis and morphology as well as the physical and mechanical properties of full- and semi-interpenetrating polymer networks (IPNs) obtained from polyester based polyurethane (PU) and poly(butyl methacrylate) (PBMA). The polyurethane was subsequently interpenetrated with butyl methacrylate monomer and ethylene glycol dimethacrylate as a crosslinker by radical polymerization using benzoyl peroxide as an initiator. Both full and semi IPNs (PU/PBMA IPNs) were obtained as soft films when cast in a glass mold. All PU/PBMA IPNs were characterized with respect to the swelling (%), apparent densities, thermal stability, morphology and mechanical properties. The morphology of the IPNs was studied by scanning electron microscopy. The effects of variations of the blend ratios on the above-mentioned properties were examined. Increasing the polyurethane component in the composite system notably increased the mechanical properties of all the IPNs. Full-IPNs exhibited higher apparent densities, mechanical properties and thermal stability than the corresponding semi-IPNs.