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Effect of Molding Conditions On Properties of Injection-Molded Polylactic Acid Parts

from SPE Plastics Research Online

The physical, thermal, and mechanical properties of thermoplastic polymers are strongly dependent on the crystalline structure and morphology of the materials. An example of a thermoplastic polymer, polylactic acid (PLA), is one of the more versatile bio-based polymers (i.e., synthesized from renewable resources). It has high stiffness and strength, and has thus received a large amount of attention in the search for alternative and biodegradable polymers. The remarkably low glass-transition temperature (less than 60°C), however, as well as its consequent low heat-deflection temperature, makes PLA unsuitable for many applications (e.g., for plastic plates and cups for hot food and drinks). more

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