![]() These polymers are anisotropic in flow, so they exhibit greater shrinkage transverse to flow rather than with the flow, which can sometimes result in some dimensional instability. A result, this highly organized molecular structure results in a defined melting point. The areas of crystallinity are called spherulites and can vary in shape and size with amorphous areas existing between the crystalline areas. Receiving the classification of a semi-crystalline polymer means that the material exhibits organized and tightly packed molecular chains. Continue reading to learn more about the differences between the two thermoplastic classifications: ![]() The main difference between these classes of thermoplastics are the arrangement of the molecular chains and how they, in turn, affect the behavior of the polymer under heat. Popular thermoplastics used in the packaging industry such as HDPE and p olypropylene, are classified as semi-crystalline, while others such as polystyrene and ABS, are considered amorphous. ![]() A defining characteristic that separates different thermoplastic polymers is whether they are considered amorphous or semi-crystalline.
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