Why do PLA plastic polymers have variable physical properties? 1

Wikipedia said:

PLA polymers range from amorphous glassy polymer to semi-crystalline and highly crystalline polymer with a glass transition 60–65 °C, a melting temperature 130-180 °C, and a Young's modulus 2.7–16 GPa.

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The polymer itself can be made into a wide range of end products. The degree of polymerization, or molecular weight (MW) of the polymer, can be varied. The MW distribution and particle size distribution can be varied. It can be annealed or not annealed. It can be blended with minor amounts of other components to enhance specific properties, but the major ingredient can still be mostly PLA. It is a versitile polymer, thus the wide range of properties to cover the wide range of end products.

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Latexman