A crystalline domain usually limited by well-defined boundaries.
Notes:
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Polymer crystals frequently do not display the perfection that is usual for low-molar-mass
substances.
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Twinned polymer crystals are, sometimes, erroneously referred to as 'crystals'.
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Polymer crystals that can be manipulated individually are often called (polymer) single
crystals. A single crystal may contain different fold domains.
Source: