Hi, on preparing a partially ionic polymer with PEG side-chains I have obtained what appears to be an amorphous polymer with a rather low glass transition temperature. This is seen from its ability to form homogenous films and its appearance in general. I have not yet made thermal measurements, DSC is currently down. On redissolving, a large part goes into solution but some of it forms a rather insoluble precipitate. This melts on heating to give the same amorphous behaviour as before. My theory is that on adding solvent, crystallisation is somehow promoted by adding solvent and the crystalline parts are hardly soluble. I am not sure whether this is a likely explanation, though and welcome any comments...
Regards, Jeppe