Highly crystallized poly (lactic acid) under high pressure

Biodegradable poly (lactic acid) (PLA) usually has a crystallinity less than 10% due to its poor crystallization ability. In this work, we found high pressure could significantly facilitate formation of crystallites of PLA, resulting in a crystallinity high up to 66.3% at pressure and temperature of...

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Veröffentlicht in:AIP advances 2012-12, Vol.2 (4), p.042159-042159-5
Hauptverfasser: Zhang, Jin, Yan, Ding-Xiang, Xu, Jia-Zhuang, Huang, Hua-Dong, Lei, Jun, Li, Zhong-Ming
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Sprache:eng
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Zusammenfassung:Biodegradable poly (lactic acid) (PLA) usually has a crystallinity less than 10% due to its poor crystallization ability. In this work, we found high pressure could significantly facilitate formation of crystallites of PLA, resulting in a crystallinity high up to 66.3% at pressure and temperature of 300 MPa and 185 ºC. High-pressure induced crystalline reorganization and lamellar thickening led to two melting temperatures in the highly crystallized PLA but without cold crystallization compared to the normal-pressure crystallized PLA. Temperature dependence of high-pressure crystallization of PLA suggested desirable crystallization temperatures for highly crystallized PLA products.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.4769351