Record number :
Title of article :
Cooperativity length evolution during crystallization of poly(lactic acid)
Author/Authors :
N. Delpouve، نويسنده , , A. Saiter، نويسنده , , E. Dargent، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2011
Pages :
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Abstract :
Effects of stereoregularity and crystallization mode on the amorphous phase dynamics are investigated for poly(lactic acid) PLA. An isothermal crystallization from the melt and a cold crystallization are imposed. For each PLA, the cold crystallization leads to the appearance of a less perfect crystalline phase and to an important rigid amorphous fraction RAF content (35%), although only 10% of RAF is generated after crystallization from the melt. Temperature Modulated Differential Scanning Calorimetry is used to determine the Cooperative Rearranging Regions (CRR) size at the glass transition temperature in the mobile amorphous phase MAP. It is shown that the CRR size in the MAP is not modified by the appearance and the spherulite growth. For the intra-spherulite MAP, a confining effect is evidenced, causing an amorphous phase thickness decrease during crystallization, and inducing a drastic CRR size reduction.
Keywords :
Three-phase model , Cooperativity length , Glass transition , Amorphous Phase , poly(lactic acid) , crystallization
Journal title :
European Polymer Journal(EPJ)
Link To Document :