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Cover: Transition metals, introduced as the second component in bimetallic Phillips catalysts, enhance their ethylene polymerization activity. In particular, second metals with low electronegativity decrease the electron density on the chromium species and therefore, improve the branching ability in ethylene polymerization. Further details can be found in the article by Y. Zeng, A. Matta, S. Dwivedi, T. Taniike, M. Terano* http://doi.wiley.com/10.1002/mren.201300119.

Cover: Photo‐ and thermal stabilities of poly(propylene) (PP)/SiO2 nanocomposites with various sizes of the SiO2 nanoparticles were studied. The cover picture points out that both, decreasing the particle size of SiO2 and lowering the quenching temperature in making the sample films improved the stability of the nanocomposites. The results strongly suggested that smaller spherulite sizes lead to higher stability of the nanocomposites. Further details can be found in the article by K.‐I. Sumino, T. Taniike, M. Terano,* and G. A. George on page 135.

Cover: Photo-and thermal stabilities of poly(propylene) (PP)/SiO 2 nanocomposites with various sizes of the SiO 2 nanoparticles were studied. The cover picture points out that both, decreasing the particle size of SiO 2 and lowering the quenching temperature in making the sample films improved the stability of the nanocomposites. The results strongly suggested that smaller spherulite sizes lead to higher stability of the nanocomposites. Further details can be found in the article by K.-I. Sumino, T. Taniike, M. Terano,* and G. A. George on page 135.

No abstract