Comparative study of the nucleation activity of third-generation sorbitol-based nucleating agents for isotactic polypropylene
| Autor: | J. M. Arribas, Gary Ellis, Marián A. Gómez, Carlos Marco |
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| Rok vydání: | 2002 |
| Předmět: |
Polypropylene
Polymers and Plastics Nucleation Concentration effect General Chemistry Surfaces Coatings and Films law.invention chemistry.chemical_compound Differential scanning calorimetry chemistry Chemical engineering law Tacticity Polymer chemistry Materials Chemistry Sorbitol Crystallite Crystallization |
| Zdroj: | Journal of Applied Polymer Science. 84:2440-2450 |
| ISSN: | 0021-8995 |
| Popis: | The nucleation activity of the sorbitol derivatives 1,2,3,4-bis(3,4-dimethylbenzylidene sorbitol) and methyldibenzylidene sorbitol are compared with that of talc, a conventional nucleating agent for the monoclinic crystalline phase of isotactic polypropylene. The thermal parameters associated with the dynamic crystallization process are studied as a function of the cooling rate by differential scanning calorimetry, and the nucleating efficiency is assessed by comparison with self-nucleation, the highest values being observed for 1,2,3,4-bis(3,4-dimethylbenzylidene sorbitol) over the whole concentration range. The nature of the polymer crystals formed in the nucleated polymer was studied by X-ray diffraction, and the data show an increase in a preferred orientation of the polymer crystallites with increasing concentration of nucleating agent. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 2440–2450, 2002 |
| Databáze: | OpenAIRE |
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