# interpenetrating polymer network (IPN)

I just learend about an interpenetrating polymer network (IPN) and that this is a way of mixing polymers. But I thought it was thermodynamically impossible to mix 2 polymers because in ∆G= ∆H -T.∆S the enthropy will never be big enough to overcome ∆H. So why is it possible with an interpenetrating polymer network (IPN)??