Influence of blending and blend morphology on the thermal properties and crystallization behaviour of PLA and PCL in PLA/PCL blends
الملخص
In this paper, we reported on the influence of PCL on the cold crystallization behaviour of PLA in different PLA/PCL blends, and on the influence of blending with PLA on the PCL crystallization behaviour and kinetics. The presence of PCL in the blends had a strong influence on PLA cold crystallization, and the extent of this influence was determined by the blend morphology. Successive self-nucleation and annealing (SSA) analysis of PCL crystallization in the blends showed that the presence and amount of PLA in the blends had a strong influence on the crystal size distribution in the main crystalline fraction of PCL. A kinetic analysis of the crystallization of neat PCL and PCL in the blends showed that the crystallization mechanism of the neat PCL changed from instantaneous/heterogeneous nucleation and two-dimensional growth to sporadic/homogeneous nucleation and two-dimensional growth with decreasing crystallization temperature, while for PCL in the blends, the mechanism over the whole crystallization temperature range was that of instantaneous/heterogeneous nucleation and three-dimensional growth into spherulites. PCL in the blends also crystallized significantly faster than neat PCL, but there was little difference between the crystallization rates of PCL in the different blends.
المجموعات
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