| Autor: |
Mohmeyer, Nils, Schmidt, Hans-Werner, Magnus Kristiansen, Per, Altstädt, Volker |
| Zdroj: |
Macromolecules; August 2006, Vol. 39 Issue: 17 p5760-5767, 8p |
| Abstrakt: |
A comparative study on the influence of chemical structure and solubility of a series of low-molecular-weight 1,4-phenylene−bisamides in isotactic polypropylene (i-PP) was conducted to explore their performance as nucleating agents and electret additives. The series consists of three isomers of dicyclohexyl-substituted 1,4-phenylene−bisamide and three asymmetrically substituted cyclohexyl/n-alkyl-1,4-phenylene−bisamides with different chain lengths. The symmetry of the molecules, the type of substitution and the length of the alkyl chain influence the solubility in the i-PP melt, the nucleation efficiency, the ratio of the - to -crystal modification and the charge storage properties. The best -nucleating efficiency was observed for the symmetrically substituted compounds, whereas the nucleation efficiency was substantially reduced in the presence of n-alkyl-substituents. The charge storage behavior of i-PP was improved only for the three dicyclohexyl-substituted 1,4-phenylene bisamides at concentrations of 100 ppm and even below. For example, a film comprising 10 ppm additive displayed charge retention of 90% after an accelerated aging (annealing for 24 h at 90 °C). |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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