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The formation of stereocomplex (SC) in enantiomeric poly(lactide)s via recrystallization of homocrystals was investigated by using simultaneous wide-angle and small-angle X-ray scattering. When the symmetric blend of poly(l-lactide) (PLLA) and poly(d-lactide) (PDLA) was heated from the glassy state at a slow heating rate (5°C/min), predominant homocrystals were formed during heating (cold crystallization)...
The isothermal crystallization behavior of a 1:1 poly(l-lactide)/poly(d-lactide) (PLLA/PDLA) mixture under pulsed shear was investigated by in-situ polarized light optical microscopy (POM) and wide angle X-ray scattering (WAXS). The effects of shear rate and temperature were studied. The results showed that application of shear flow increased the nucleation density, crystallization rate and degree...
The non-isothermal crystallization behavior of poly(l-lactide)/poly(d-lactide) (PLLA/PDLA) blends under shear was investigated by in-situ polarized light optical microscopy (POM) and wide angle X-ray scattering (WAXS). Pulse shear for 5 seconds was applied to the melt during cooling. The effects of shear temperature and shear rate were systematically studied. It was found that the shear field could...
In order to obtain a clear understanding to the interplay between the homogeneous crystal (α form) of PLA and its stereocomplex (SC) crystal, the crystalline behavior of PLA homopolymer under the surface drive force of SC and homopolymer fibers has been investigated in the present work. It was found that the nucleating density of the transcrystallization layer along the SC fiber was much lower than...
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