Effect of β-Nucleating Agent on the Crystallization, Mechanical Properties, and Heat Resistance of Injection-Molded Isotactic Polypropylene
| Autor: | Qiang Dou, Yuan-Hong Shi |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Polypropylene
Polarized light microscopy Materials science Polymers and Plastics Nucleation Izod impact strength test General Chemistry Condensed Matter Physics law.invention chemistry.chemical_compound Differential scanning calorimetry chemistry law Tacticity Materials Chemistry Heat deflection temperature Composite material Crystallization |
| Zdroj: | Journal of Macromolecular Science, Part B. 52:476-488 |
| ISSN: | 1525-609X 0022-2348 |
| DOI: | 10.1080/00222348.2012.715873 |
| Popis: | Injection-molded β-isotactic polypropylene (β-iPP) was prepared with a commercial β-nucleating agent (NT-A). The effect of NT-A on the crystallization, mechanical properties, and heat resistance of β-iPP was investigated by differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD), polarized light microscopy (PLM), and mechanical and heat deflection tests. DSC and WAXD analysis showed that the content of β-crystals in the nucleated iPP was higher than that of pure iPP, and the content of β-crystals of the core was higher than that of the skin. PLM observations showed that injection-molded iPP had an obvious skin-core structure. NT-A induced abundant β-crystals and resulted in small spherulites which improved the Izod notched impact strength. When the content of NT-A was 0.075wt%, the Izod notched impact strength reached a maximum, 2.6 times more than that of pure iPP. The heat distortion temperature was also improved by NT-A. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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