There is little similarity between crystals and amorphous polymers.
However, many polymers (e. g, linear polyethylene, nylon, and Kevlar) are highly crystalline.
Thus, molecular crystals (e.g. dry ice, ice) and crystalline polymers share some similarities.
In both, the molecules are
• arranged in a regular repeating pattern
• bonded to each other by London dispersion forces
• poor conductors of heat and electricity