Hey thanks for the answers!
I did some further reading from book Integrated Biomaterials Science, and it states: "The ability of a material to crystallise is determined by the regularity of its molecular structure. A regular structure is potentially capable of crystallinity while an irregular structure will tend to give amorphous polymers. Generally, the crystallisation is limited to linear or slightly branched polymers with high structural regularity. "
So if I read this correctly, from molecular structure it is possible to gain insight into materials ability to crystallise even without experimental tests. So if this logic holds, I need to analyse poly(ethylene glycol-co-lysine-co-D,L lactide) vs PLLA structures to see differences in regularity and branches. What do you think?