| Autor: |
Prachum, Yongyut, Adam Strauss, Roman Helmuth, Kiatkamjornwong, Suda |
| Předmět: |
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| Zdroj: |
Journal of Applied Polymer Science; Oct2011, Vol. 122 Issue 2, p1066-1076, 11p |
| Abstrakt: |
Polypropylene (PP) and polypropylene/polypropylene- g-maleic anhydride/ organomontmorillonite (PP/PP- g-MA/OMMT) nanocomposites were modified with 0.05 to 0.3% (w/w) of the aryl amide β-nucleator to promote the formation of hexagonal crystal modification (β-phase) during melt crystallization. The nonisothermal crystallization behavior of PP, PP/PP- g-MA/OMMT and β-nucleated PP/PP- g-MA/OMMT nanocomposites were studied by means of differential scanning calorimetry. Structure-property relationships of the PP nanocomposites prepared by melt compounding were mainly focused on the effect and quantity of the aryl amide nucleator. The morphological observations, obtained from scanning electron microscopy, transmission electron microscopy and X-ray diffraction analyses are presented in conjunction with the thermal, rheological, and mechanical properties of these nanocomposites. Chemical interactions in the nanocomposites were observed by FT-IR. It was found that the β-crystal modification affected the thermal and mechanical properties of PP and PP/PP- g-MA/OMMT nanocomposites, while the PP/PP-g-MA/OMMT nanocomposites of the study gained both a higher impact strength (50%) and flexural modulus (30%) compared to that of the neat PP. β-nucleation of the PP/PP- g-MA/OMMT nanocomposites provided a slight reduction in density and some 207% improvement in the very low tensile elongation at break at 92% beta nucleation. The crystallization peak temperature ( T [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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