news pentamethyl diethylenetriamine (pc-5)’s role in improving impact resistance of polyurethane elastomers pentamethyl diethylenetriamine (pc-5): a key component in enhancing impact resistance of polyurethan... 04/07107Pentamethyl Diethylenetriamine (PC-5)’s Role in Improving Impact Resistance of Polyurethane Elastomers