I don't consider Aquinas a very good source about such questions. He considers Aristotle (among others) as an authority.Here is Aquinas on the issue:
Anyway, the question of free will makes no sense for God.
There are aspects of our soul which clearly don't have free will, for example, the subconscious or unconscious. Only when conscious do we have free will, and only then regarding things involving the will.
Materialist scientists want to deny free will because, I think, they might have to consider the existence of something outside of the physical material universe.
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