SEARCH Articles Figures Tables Covalent semi-IPNs IPNS Interpenetrating polymer networks semi-IPNs Polyurethane-containing semi-IPNs Polyurethane-containing semi-IPNs with immiscible components Semi-IPN Semi-IPN Semi-IPN Formed by Curing PU Network in the Presence of PBMA Semi-IPN Membranes Semi-IPNs definition Semi-IPNs polymer networks Semi-interpenetrating networks IPNs) Thermosetting semi IPNs