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Antioxidant in form of hindered phenol structure is commonly used to prolong the service life of polymer, while the low molecule antioxidant has defect for its low thermal stability and physical loss. Herein, the feasibility of using co-condensed silica immobilized antioxidant (denoted as SN-NH2-AO) to improve the thermal-oxidative stability of polypropylene (PP) was evaluated. Firstly, SN-NH2-AO...
The main purpose of this study is to examine the effect of nucleation on the formation of polymorphism in melt-crystallized syndiotactic polystyrene (sPS). By depressing the nucleation barrier (i.e., introducing nucleating agent), the tendency of forming, a metastable crystalline phase, α crystal, significantly increased. The metastability of crystalline phase was dependent upon the nucleation process...
Syndiotactic polystyrene (sPS) blends with highly-impact polystyrene (HIPS) were prepared with a twin-screw extruder. Isothermal crystallization, melting behavior and crystalline morphology of sPS in sPS/HIPS blends were investigated by differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD) and polarized optical microscopy (POM). Experimental results indicated that the isothermal...
Syndiotactic polystyrene (sPS)/nano-CaCO 3 composites were prepared on a twin screw extruder for the first time. Differential scanning calorimeter and wide-angle X-ray diffraction were used to investigate the effect of maximum melting temperature (T max ) and the content of nano-CaCO 3 on the crystal forms and melting behavior of sPS for non-isothermal crystallization. The...
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