I have been in the process of making quilts from shirts, etc., from close neighbors that passed away (as memory quilts for some of the family). Naturally, a lot of them are poly blends. Some of them "take a crease," some not so much. I think that I would try some of it and see how it handles when you iron it and give a good tug on the seams. They may be perfectly good for the everyday drag-around quilts or they may be just total frustration. In any event, sure would quilt them with poly batting. With the shirt fabrics I have been using, I increased the seam allowance to 1/2" because of a fear of fraying, but so far, so good.