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I'm trying to disassemble some models I bought from a friend to clean their mold lines and whatnot and I'm wondering if anyone has any good suggestions for chemicals that will soften the glue without damaging the plastic models themselves?

If you are talking about plastic cement, there is nothing out there that I am aware of that can break the bond.

What plastic cement does is melt the plastic and then when it dries, it creates a bond that can't be broken.

What I would do is just get a very sharp x-acto knife and cut along the seams.

Well.. fun fun.. here's hoping I don't detach any digits

It does also depend on what kind of how much plastic cement was used. Some kinds are quite permanent, while others can be popped apart with a bit of "persuasion".

I would try soaking the models in either Isopropyl alcohol or in windex, I have had good luck with either.