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In this work, an abnormal melting behavior of isotactic polypropylene (iPP) was investigated by polarized optical microscopy (POM), temperature-modulated differential scanning calorimetry (TMDSC), scanning electron microscopy (SEM), wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS). It can be found by POM that the melting of α-iPP spherulites isothermally crystallized at...
The effect of deformation rate and temperature on the crystal−crystal transition of sPP with [rrrr] = 78% was studied by wide-angle X-ray diffraction measurements, using synchrotron radiation. Three stretching temperatures (25, 40, 90 °C) and two different deformation rates (10 and 20 mm/min) were selected. At lower stretching temperature (e.g. 25 °C), the transformation of form I to mesomorphic phase...
The cold crystallization and melting behavior of poly(3-hydroxybutyrate)(PHB) layer on amorphous Poly(vinyl phenol) (PVPh) and Si wafer substrate were studied by using Grazing incidence X-ray diffraction and infrared reflection-absorption spectroscopy. Compared to the PHB on Si wafer, the PVPh layer shows great influence on the crystallization and melting behavior of PHB layer. The depression extent...
In polymer processing operations, the molten polymer chains are frequently subjected to shear or/and elongation flow fields, which will produce molecular chain orientation of the melt. This leads to the orientation-induced crystallization has been an important subject in the field of polymer physics. Systematic studies indicated that the chain orientation influences the crystallization kinetics, the...
The exact molecular chain orientation of poly(β-hydroxybutyrate) (PHB) in ultrathin films was successfully probed using surface-sensitive, grazing incidence X-ray diffraction techniques. The crystal orientation of spin-coated PHB films was very sensitive to free surface and thermal annealing. In pristine films, the free surface easily exerted its influence on PHB crystallization and caused lamellar...
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