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The Kinetics of Melting Crystallization of Poly-L-Lactide
- Source :
- Polymer-Plastics Technology and Engineering. 46:863-871
- Publication Year :
- 2007
- Publisher :
- Informa UK Limited, 2007.
-
Abstract
- The influence of non-isothermal melt crystallization on thermal behavior and isothermal melt crystallization kinetics of poly-L-lactide (PLLA) were investigated by differential scanning calorimetry (DSC), polarizing micrograph (POM) and x-ray diffraction (XRD). Crystallization performed at lower cooling rates (2°C·min−1) is accompanied by a variation of the kinetics around 118°C. The glass transition temperature of PLLA decreases with increase of cooling rate, and the crystallinity at the end of crystallization increases with decreasing cooling rate. The size of PLLA spherulites increases with a decrease in the cooling rate, and PLLA becomes almost amorphous cooled at rapid rate (>10°C·min−1). PLLA exhibits an Avrami crystallization exponent n = 3.01±0.13 in isothermal crystallization in the range from 90°C to 140°C. According to Hoffman-Lauritzen theory, two crystallization regime are identified with a transition temperature occurring at 118°C, and the value of Kg(II)/Kg(III) is 2.17 [Kg(II) = 6.025 × 10...
- Subjects :
- Materials science
Polymers and Plastics
General Chemical Engineering
Materials Science (miscellaneous)
Transition temperature
Crystallization of polymers
Isothermal process
law.invention
Amorphous solid
Crystallinity
Differential scanning calorimetry
Chemical engineering
law
Polymer chemistry
Materials Chemistry
Crystallization
Glass transition
Subjects
Details
- ISSN :
- 15256111 and 03602559
- Volume :
- 46
- Database :
- OpenAIRE
- Journal :
- Polymer-Plastics Technology and Engineering
- Accession number :
- edsair.doi...........d2cea3545af50473c4ceade2b11c6904