PLA is drilled from corn and potato which are enriched starch and dissolved by enzymes to glucose, finally compounded with L-lactic fermented by lactic-acid germs. Use several ways to get PLA, for example, heat L=lactic for dehydration to get ring polymers (dehydrated lactic) then by opening the ring and polymerization to get PLA (called L-lactic method or Cargill-Dow method). The former is bigger than the latter in molecular weight. The heat-resistance of PLA is weak, with crystalline speed and brittleness (called triple barriers). If we can promote heat-resistance, crystalline speed, improve brittleness and shorten the cycling time of process for mass production, the PLA will have more competitive advantages in market with its renewable and composted nature.

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