Crystallization kinetics and structure evolution of a polylactic acid during melt and cold crystallization View Full Text


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Article Info

DATE

2015-06

AUTHORS

J. Henricks, M. Boyum, W. Zheng

ABSTRACT

The isothermal melt and cold crystallization and the evolutions of the mobile and rigid amorphous fractions during the crystallization are fully investigated for a polylactic acid using differential scanning calorimetry. The crystallization kinetics is analyzed through fitting the Avrami equation to two different sets of crystallinity data, one obtained from the crystallization extherms and one from the enthalpies of melting and cold crystallization. Both sets yield similar results, indicating the consistency between these two methodologies. The cold crystallization shows clearly faster crystallization rate and has a higher activation energy of 172.3 ± 8.9 versus 109.6 ± 8.8 kJ mol−1 for the melt crystallization. The Avrami exponent of the cold crystallization seems to decrease with increasing crystallization temperature, whereas the exponent of melt crystallization is relatively constant. In addition to the crystalline phase, properties of the mobile and rigid amorphous fractions are also studied and compared. With the increase in crystallinity, the glass transition temperature (Tg) of the mobile amorphous phase is found to decrease during the cold crystallization, whereas Tg decreases and then increases during the melt crystallization, indicating slightly different environment formed. However, no obvious difference is found regarding the heat capacity change at Tg nor the cooperative length scale associated with Tg. Furthermore, the rigid amorphous fraction is determined and found to be 30 % at the maximum crystallinity for the both cold- and melt-crystallized samples. More... »

PAGES

1765-1774

References to SciGraph publications

  • 1973-11. Investigation of the structure of solution grown crystals of lactide copolymers by means of chemical reactions in COLLOID AND POLYMER SCIENCE
  • 2013-12. Thermal properties and cold crystallization kinetics of surface-treated banana fiber (BF)-reinforced poly(lactic acid) (PLA) nanocomposites in JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
  • 2014-12. Effect of graphene nanoplatelets as nanofiller in plasticized poly(lactic acid) nanocomposites in JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
  • 2014-12. Thermal behaviors and mechanical properties of halloysite nanotube-reinforced poly(lactic acid) nanocomposites in JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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  • 2014-06. Electrospun fibers of poly(ethylene terephthalate) blended with poly(lactic acid) in JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
  • 2015-01. Non-isothermal cold crystallization kinetics of poly(lactic acid)/poly(butylene adipate-co-terephthalate)/treated calcium carbonate composites in JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
  • 2013-07. The crystallization rate and morphological structure of poly(ethylene/trimethylene terephthlate) copolyesters under isothermal melt-crystallization and cold-crystallization in JOURNAL OF POLYMER RESEARCH
  • 2001-04. A Literature Review of Poly(Lactic Acid) in JOURNAL OF POLYMERS AND THE ENVIRONMENT
  • 2014-12. Thermal and mechanical analysis of injection moulded poly(lactic acid) filled with poly(ethylene glycol) and talc in JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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    46 schema:description The isothermal melt and cold crystallization and the evolutions of the mobile and rigid amorphous fractions during the crystallization are fully investigated for a polylactic acid using differential scanning calorimetry. The crystallization kinetics is analyzed through fitting the Avrami equation to two different sets of crystallinity data, one obtained from the crystallization extherms and one from the enthalpies of melting and cold crystallization. Both sets yield similar results, indicating the consistency between these two methodologies. The cold crystallization shows clearly faster crystallization rate and has a higher activation energy of 172.3 ± 8.9 versus 109.6 ± 8.8 kJ mol−1 for the melt crystallization. The Avrami exponent of the cold crystallization seems to decrease with increasing crystallization temperature, whereas the exponent of melt crystallization is relatively constant. In addition to the crystalline phase, properties of the mobile and rigid amorphous fractions are also studied and compared. With the increase in crystallinity, the glass transition temperature (Tg) of the mobile amorphous phase is found to decrease during the cold crystallization, whereas Tg decreases and then increases during the melt crystallization, indicating slightly different environment formed. However, no obvious difference is found regarding the heat capacity change at Tg nor the cooperative length scale associated with Tg. Furthermore, the rigid amorphous fraction is determined and found to be 30 % at the maximum crystallinity for the both cold- and melt-crystallized samples.
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