Towards controlled cationic polymer growth from inorganic oxide defects: Directing the mechanism of polystyrene grafting from γ-irradiated silica

D’Acunzo, Francesca; Gentili, Patrizia; Masci, Giancarlo; Ursini, Ornella

doi:10.1016/j.polymer.2014.08.041

Cited by 3 publications

(1 citation statement)

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“…In the past few decades, as a typical type of nanomaterial, hollow nanoparticles have achieved great development. [27][28][29][30][31] They can be prepared by soft/hard templating [32][33][34][35] or selfassembling methods. [36][37][38] Among them, the route to hollow nanoparticles via removing the core of core/shell nanoparticles has been well established.…”

Section: Introductionmentioning

confidence: 99%

Preparation and unique dielectric properties of nanoporous materials with well-controlled closed-nanopores

Zhao

Wei

Huang

et al. 2016

Phys. Chem. Chem. Phys.

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Although general porous materials have a low dielectric constant, their uncontrollable opened porous structure results in high dielectric loss and poor barrier properties, thus limiting their application as interconnect dielectrics. In this study, polymeric nanoporous materials with well-controlled closed pores were prepared by incorporating polystyrene (PS) hollow nanoparticles into polyethylene (PE/HoPS). SEM images suggested a closed porous structure for PE/HoPS. In order to show the effect of the porous structure on dielectric properties, nanoporous materials with an opened or uncontrollable porous structure were prepared by etching SiO2/PE or PE/PS@SiO2 composites. PE/HoPSs composites showed an apparently lower dielectric constant and loss compared with the opened porous PE, demonstrating the advantages of a closed porous structure upon enhancing low-dielectric performance. The low dielectric performance of the PE/HoPS composites is linked with high water resistance owing to their closed porous characteristics. When incorporating 15.3 wt% HoPS (porosity: ∼6.9%), the dielectric constant reached 2.08. This value is lower than that calculated from the serial model. Our work revealed that the incorporation of HoPS not only reduces the porosity, but also alters the intrinsic properties of PE, as a result, leading to a greatly reduced dielectric constant.

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