Abstract
The crystallization behavior of poly(butylene adipate) (PBA) in the sheared PBS/PBA blend, as well as on highly orientated poly(butylene succinate) (PBS) substrate, was studied by means of DSC, POM, Raman microscopy, and XRD. The results showed that the pre-existing orientated PBS crystals exhibit a very strong nucleation ability toward PBA as reflected by the increased crystallization temperature and the occurrence of heteroepitaxy and transcrystallization of PBA on the PBS substrate. The epitaxial crystallization of PBA on the PBS substrate results in the formation of α-form PBA crystals in any crystallization conditions.
Highlights
Epitaxial growth, as a specific case of surface-induced crystallization, originates from the interactions between two polymers at their interface
There was another crystallization peak ranging from 0 ◦ C to 9 ◦ C, as indicated by the black arrow, and the onset crystallization temperature was about 20 ◦ C lower than neat poly(butylene adipate) (PBA), suggesting that the crystallization of this part of the PBA
The similar fractional and confined crystallization of PBA observed in the 30/70 blend appeared in the 50/50 and 70/30 blends
Summary
As a specific case of surface-induced crystallization, originates from the interactions between two polymers at their interface. Yang et al have investigated the effect of blend ratios on the crystallization PBA in PBS/PBA blends and found that the nonisothermal crystallization temperature of PBA is greatly reduced in PBS-rich blends, due to the spatial confinement of the pre-existing PBS crystals. This has been further proved by the morphological evidence. Yang et al have found that in blends with a PBS content of less than 70%, the lowest crystallization temperature of the formation of α-form PBA decreases and the temperature range of the phase transition from the β- to α-PBA becomes wider [17]. It was found that pre-existing orientated PBS crystals exhibit a very strong nucleation ability toward PBA and the epitaxial crystallization of PBA on the PBS substrate results in the formation of α-form PBA crystals under any crystallization conditions
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