Dataset Information

Original Basic Activation for Enhancing Silica Particle Reactivity: Characterization by Liquid Phase Silanization and Silica-Rubber Nanocomposite Properties.

ABSTRACT: Silica fillers are used in various nanocomposites in combination with silanes as a reinforcing filler. In tire technology, silica is generally functionalized before (pre-treated) or during mixing (in-situ silanization or post-treated). In both cases, a soft base catalyst (e.g., triethylamine or diphenyl guanidine, DPG) is typically used to accelerate and increase the yield of the silane/silica coupling reaction. In this study, we investigated how pre-treatments of silica particles with either strong amine or hydride bases impact the silanization of silica prior to or during SBR mixing for silica-rubber nanocomposite fabrication. Our findings are supported by molecular characterization (solid state ²⁹Si NMR, ¹H NMR and TGA), and scanning electron microscopy. In addition, the impact of these silica pre-treatments on a nanocomposite's mechanical properties was evaluated using dynamic mechanical analysis (DMA).

SUBMITTER: Moretto E

PROVIDER: S-EPMC9105500 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature

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Original Basic Activation for Enhancing Silica Particle Reactivity: Characterization by Liquid Phase Silanization and Silica-Rubber Nanocomposite Properties.

Moretto Enzo E Yan Chuanyu C Dieden Reiner R Steiner Pascal P Duez Benoît B Lenoble Damien D Thomann Jean-Sébastien JS

Polymers 20220420 9

Silica fillers are used in various nanocomposites in combination with silanes as a reinforcing filler. In tire technology, silica is generally functionalized before (pre-treated) or during mixing (in-situ silanization or post-treated). In both cases, a soft base catalyst (e.g., triethylamine or diphenyl guanidine, DPG) is typically used to accelerate and increase the yield of the silane/silica coupling reaction. In this study, we investigated how pre-treatments of silica particles with either st ...[more]

PMID: 35566846

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Project description:Composite membranes that contain an inorganic phase dispersed in a polymer are valuable for various applications because they combine the flexibility of polymers with the excellent thermal stability and gas selectivity of inorganic materials. The appearance of voids at the interface between the organic and inorganic phases is a central issue in such nanocomposite design. One approach to tackling this issue is grafting the inorganic phase with silane coupling agents that serve as linkers for the two phases. The study reports the structural improvement of nanocomposite membranes by filler silanization in an environmentally friendly process. Silanization of silica nanoparticles with 3-aminopropyldiethoxymethylsilane was carried out by using supercritical carbon dioxide. The process based on supercritical solvent impregnation was designed to minimize the loss of nanoparticles and the generation of organic effluents. Surface-modified nanoparticles were obtained with grafting degrees of up to 18.7%. SEM imaging confirmed less prominent nanoparticle agglomeration after the modification. In the next step, nanocomposite membranes based on cellulose acetate (CA) (20 wt % nanosilica) and starch-chitosan blend (15 and 20 wt % nanosilica) were fabricated using solvent-casting. Dope solutions were prepared using neat and silanized nanosilica by employing an alternation of stirring and sonication. The membranes containing modified nanoparticles showed a more homogeneous structure. The silanization apparently improved the compatibility of the nanosilica with the polymers. Consequently, high-pressure hydrogen permeation through the nanocomposite CA-based membrane with 20 wt % modified nanoparticles was considerably reduced (93%) compared to the membrane with the pristine nanosilica. The oxygen barrier properties of the starch-chitosan blend were improved by 98.3% by adding 20 wt % of modified nanosilica, yielding a film with an oxygen permeability value as low as 0.007 cm3 mm/(m2 atm day).

Dataset Information

Original Basic Activation for Enhancing Silica Particle Reactivity: Characterization by Liquid Phase Silanization and Silica-Rubber Nanocomposite Properties.

Publications

Original Basic Activation for Enhancing Silica Particle Reactivity: Characterization by Liquid Phase Silanization and Silica-Rubber Nanocomposite Properties.

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